Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b401cc202a4b73f…

MALICIOUS

PDF

113.0 KB Created: 2021-06-27 15:06:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 4e5e62be582794cf02b6ae01c162456b SHA-1: ae090a21da55f2bbe4462d05c9063572e984c66c SHA-256: 5b401cc202a4b73f3d63c02114e1baebc4513100e0068e5792cf86c1a935ccb3
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to websites hosted on compromised CMS platforms and disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these external links.

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://zentrumok.com/userfile/files/68976956396.pdf In PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/6a27010cdc72ec62d522fb486f85f78d/57471541254.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608fe9bb9bb7f---98179981913.pdfIn PDF document text
    • http://ottotech.center/userfiles/file/wotev.pdfIn PDF document text
    • http://paillasse.hu/userfiles/file/bezizotajirugalazaz.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/j2iig6kcvlv5kjdkqkdirgshf2/49693343271.pdfIn PDF document text
    • https://acornschoolcharleston.org/wp-content/plugins/super-forms/uploads/php/files/5625ab2666df40c7178dd14dfa904aa9/dofijuxegejogixet.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/vbh3gfu8u2u0agdhq8g1j6dnn5/wekuzexonexipusudu.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/6dc5bc04202cb6d54dd7a2bccb690343/13251575440.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dbabd3e97a---13281209339.pdfIn PDF document text
    • https://otelnamore.com/wp-content/plugins/super-forms/uploads/php/files/4c1680ed1390cd0ab45a2337de652aa1/96167884703.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/otckbcu9emd7f8kh4fmvjoi3gt/jovediwev.pdfIn PDF document text
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/56d2ehu6ado88rk7sivgmekvu8/19422752647.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/92lmo3eb50ge17h1rhhvt7t342/76754093105.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/d3c9dbd6faa4089864b8694c2a18aa9b/toporowit.pdfIn PDF document text
    • https://alperbehang.nl/userfiles/file/93955775433.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/62398992197be0016c0c10c807eb11da/94568055248.pdfIn PDF document text
    • http://titadoorbinhduong.com/upload/files/5344401543.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093a29235020---nazogixexuxibe.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/0fa37ef62891e3d01a96e9412e922a50/vutelutewobamejisabokom.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/15453989720.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608133c64db6b---vosukadumo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=logical+thinking+quotesPDF 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_off0001596a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1596A 17436 bytes
SHA-256: 9aa593910d5625c70d93097b3ae363aee11d50ec12a855d03a58b6f7931b0a46
font_01_sfnt_off000186f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x186F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00019f0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19F0E 10704 bytes
SHA-256: f7817c70ce0e99dc073136a416245e043a0c007b754c5eeadd398f3903a44073

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