Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a32416866614c2b…

MALICIOUS

PDF

71.4 KB Created: 2021-09-13 11:49:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 30c279138475d877f54a7c6d8ed6faf0 SHA-1: fc3f4e23d36b6b8fe94d2da0fce9738bcb1abbfa SHA-256: 1a32416866614c2b467ea031e8453455b701bb9b35467025d601fece9ff3f9d0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple potentially compromised websites, some hosted on disposable domains. The embedded URLs and the PDF's structure suggest an attempt to trick users into visiting these sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://shinhwajudan.com/userData/board/file/83162939470.pdf In PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d6470b2177---fonuwutesuneguvawe.pdfIn PDF document text
    • http://arebiatours.com/uploads/files/57937125801.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e75a39e4a3---wenaxukufojodozo.pdfIn PDF document text
    • http://velocimapper.com/webfiles/file/93591529253.pdfIn PDF document text
    • http://svsteinfurth.de/radsportfiles/file/42017121977.pdfIn PDF document text
    • http://cioccolatogallucci.it/userfiles/file/78607819354.pdfIn PDF document text
    • http://tg-focus.ru/userfiles/files/lolunelesixivojifo.pdfIn PDF document text
    • http://lustigersteirer.at/userfiles/file/20202102884.pdfIn PDF document text
    • https://sibservis.com/ckfinder/userfiles/files/somixopafogume.pdfIn PDF document text
    • https://hunghiephuylog.com/upload/files/39496676638.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/b16e163b047178fd6c6f577acbc70628/3689300627.pdfIn PDF document text
    • http://aisne.proximeo.com/ckfinder/userfiles/files/roxaletemepumerijomajesem.pdfIn PDF document text
    • https://namkhoasaigon.vn/web/images/files/mobidukonareronarokal.pdfIn PDF document text
    • https://aquamedicasatumare.ro/ckfinder/userfiles/files/71075490309.pdfIn PDF document text
    • https://rainbowfurnitures.com/files/files/jedogexubezivo.pdfIn PDF document text
    • https://hinodecoder.com/userfiles/file/rubujot.pdfIn PDF document text
    • https://worldpigment.com/image/upload/File/babinotodafi.pdfIn PDF document text
    • http://trufeel.com/ckeditor/ckfinder/uploadfile/files/57791443711.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/677e64fec11c529b9abe7a42a16e3b12/kosexunenoketabepunibixu.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136f45ef099e---zobujenika.pdfIn PDF document text
    • https://mehreganimaging.ir/images/upload/files/40410453013.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=ps4+emulator+apk+gta+5+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b58c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB58C 11136 bytes
SHA-256: 317590c6ea811b793eb874c5018c072c29c813bd2c424c3764f39d9401adedf0
font_01_sfnt_off0000cf85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF85 15892 bytes
SHA-256: 83f33ed50f659ec914bce7a82f80cb1d91ff32b2712d6b6b29c3ba8c9bf96fb7
font_02_sfnt_off0000f86d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF86D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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