Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f2d581d653dc93c…

MALICIOUS

PDF

95.3 KB Created: 2021-06-26 02:18:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 9e1b23be04f76f4f24f1b2197da8b752 SHA-1: bda1af160efc109b0ceddc90cda7bfa42a959170 SHA-256: 0f2d581d653dc93ca1146622a95ec8903b77a15339308d397c9010c55e2d1a33
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The document contains numerous links to compromised WordPress upload storage and disposable hosting, suggesting a link farm designed to host malicious files. It also contains an instruction to disable security software, a common tactic to facilitate further malicious activity. While no scripts were explicitly extracted, the presence of embedded URLs and the overall structure strongly indicate an attempt to trick the user into downloading a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9918

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16083e07e7e2ec---toziwapoze.pdf In PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/3052d92fc545c06d078f476d4383dd24/gitewusiwipigugo.pdfIn PDF document text
    • http://fxmeat.com/upload/file/c11d3da9b08782278f11ab62ec350ed3.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160974fb5a2440---pevaxewibolekabo.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/61905fcd5c5520a1f80738ae2ab77b63/14846613593.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16079bbc248e1b---28970192787.pdfIn PDF document text
    • http://slp72.com/clients/7/7b/7b902bee17765b19ebdde6030f24742d/File/nugizuvikotixaworelogi.pdfIn PDF document text
    • http://strahovka66.ru/userfiles/file/29019328954.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/7urmgqc1atrjj39u12qujhq3p5/94921145346.pdfIn PDF document text
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/b31bca3c839e31ab2aa640ca82b6206e/91651991754.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/50ffecf064afd4fb00273d8042317283/70641452443.pdfIn PDF document text
    • http://auxerretv.com/content/public/file/vofivoliwatepo.pdfIn PDF document text
    • https://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/9upiuskodog69unnqq8nrde6hu/37649555731.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6915e7a545---50864771195.pdfIn PDF document text
    • https://andrejc.si/files/file/49294427188.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608146678d461---rovadefasamaxeberofoj.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/xewelizopu.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160ac66a62a608---84828700623.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/80f92b2f282cb6f0eeb6a820ce832fae/84340316487.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/61045982851.pdfIn PDF document text
    • https://autotrans911.com/thread/admin/uploads/file/7817215678.pdfIn PDF document text
    • http://euro520.net/userfiles/file/16227748631673034814.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082b6014adb4---gudopo.pdfIn PDF document text
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/76d8b06b9fe28287419010d2abe13db8/papopenosalal.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a71ca9afa8c---poxojebamoxasurosuvovu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=need+for+speed+shift+2+free+downloadPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00015362.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x15362 17492 bytes
SHA-256: 61b38a0f1425e170c41c6c2237164d227be380a73805ba83c5b76a5382ff733a
font_00_sfnt_off0000f313.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF313 10780 bytes
SHA-256: bd87e93d5fc95fcf8cc09533ea5206348691d1060ce3220db886d60371f24596
font_01_sfnt_off00010bef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BEF 17924 bytes
SHA-256: cd741b32ff94906334a989890d96d8bbeefecf47154968f403c17b81df42623f
font_02_sfnt_off00013b51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B51 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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