Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f6fac1346acb346…

MALICIOUS

PDF

85.9 KB Created: 2021-07-19 07:15:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8b6022373f766745cf6bd336ab23fa18 SHA-1: 97ef7f92e1211337bfea44009a1611154c42227a SHA-256: 6f6fac1346acb3464b6275b3145423960860dec2d93f3dcdeef52701d2ca4515
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous links pointing to compromised WordPress sites and other disposable hosting, suggesting a link farm designed to redirect users. The presence of these links indicates an attempt to lead users to malicious destinations, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bff89290fc---87348065607.pdf In PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d59c2f9a40c---32642547584.pdfIn PDF document text
    • http://cmuniontravel.com/userfiles/files/lizinabukanegorovi.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/160b94585defdc---15614717017.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/17988c7904c6754a5115a965f598dd53/belazavuzagujigaf.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607290fd539e6---jelubepiweve.pdfIn PDF document text
    • http://marinapogon.pl/upload/file/44290399299.pdfIn PDF document text
    • http://carszana.com/image/upload/File/guxitadodivopafopilizokel.pdfIn PDF document text
    • http://stihoplet.by/upload/editor/files/99940601865.pdfIn PDF document text
    • http://xn--b1akwe.xn--p1ai/userfiles/file/56473774145.pdfIn PDF document text
    • http://wawabed.pl/uploads/userfiles/file/jejeporiwuvapapitubi.pdfIn PDF document text
    • http://rideabikenews.com/user_img/files/32025204207.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/acd9fc79d8f04e229ca900cc3b6903e0/58108220686.pdfIn PDF document text
    • http://ecovn.vn/uploads/news_file/4013832186.pdfIn PDF document text
    • http://grandp.ru/userfiles/file/lirekavip.pdfIn PDF document text
    • http://munsusa.org/userfiles/file/20210613214719.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606f24d37f56c---87351128519.pdfIn PDF document text
    • http://myconnect-thailand.com/image/upload/File/gutomolor.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160b1b4b4eb2a3---74934858290.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609b891ac75ae---lixefoveramesi.pdfIn PDF document text
    • http://matchedtubes.de/userfiles/file/nenupamusepixunefajip.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b44b8cdad39---56592512705.pdfIn PDF document text
    • https://unicornproduction.gr/wp-content/plugins/super-forms/uploads/php/files/9dbe44af1118c12ac868bbfce1cbc622/15834414553.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=pdf+expert+for+android+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_off0000eee3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000106fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106FA 10512 bytes
SHA-256: 502f307c08db55e4295b3ec3fbd00be4239245663de0acce8fc7c29b8542712a
font_02_sfnt_off00011f0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F0B 16804 bytes
SHA-256: 7a4c2aab9318166c9cc2fc3c1a304f021442dd3399877a2aceb49efa0b3cfbcd

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