Malicious PDF — malware analysis report

Static analysis result for SHA-256 16b65afa39d0995a…

MALICIOUS

PDF

121.1 KB Created: 2021-06-29 05:54:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 2bda4f211128d1d7b63693ff9946b50e SHA-1: 5409737cbfe2ee8a4ef2dfd489ea26aa7294d403 SHA-256: 16b65afa39d0995afdf2ed126b234e2b8329904ff87877297655a22f6a347d8b
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a phishing or tech-support scam. It contains numerous embedded URLs pointing to compromised websites and disposable hosting, likely serving as a lure. The heuristic 'SE_CALLBACK_LURE' specifically indicates the document's intent to prompt the user to call a phone number, a common tactic in such scams.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) or Microsoft license-boilerplate documents that carry no urgency or charge/dispute escalation.
  • 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 https://pistant.ru/uplcv?utm_term=is+the+earth+round+according+to+the+bible PDF link annotation
    • http://golden-candies.ru/webroot/files/files/5050899316.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/e334c531a78bfa0ce1accdea0d3592d9/rewixasozunugokowatis.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609bfd54041f0---1619712322.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/6oc738qrd7bkpaj80iu7cmoo5q/40311203719.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/a58009350ebf1bf81cbe88fd2fba6fa7/wexifamiliwoxom.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071eaee69f26---11321590269.pdfIn PDF document text
    • http://bidhichand.org/sahodyatarntaran/userfiles/file/joletutobugijugaxur.pdfIn PDF document text
    • http://cleanyachts.it/writable/public/userfiles/file/20120136586.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/ogth3hfvhhikee2ocspv9hdq0t/42198913405.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/sapudineripumoxi.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b55a5a6ab86---79078572465.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/5854044490.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/05563793d318f0130e311cbea7fef5c6/82450352966.pdfIn PDF document text
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/160911a65a8deb---bipiwaredalafurid.pdfIn PDF document text
    • http://campbellelectronics.com/uploads/67056732929.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d5aa48fe58---mediwalopigefapuvagitipir.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/vq5q8s2l4a2a3o7mdt67396t4m/galixirizoride.pdfIn PDF document text
    • http://bogelaipigeon.com/upload/file/48729074540.pdfIn PDF document text
    • https://bookatowncar.com/userfiles/file/19045366182.pdfIn PDF document text
    • 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_off00017991.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17991 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000191a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x191A3 17668 bytes
SHA-256: 22b5dc4acb6c89eec518f39e59b9005c8aae3f2677045d4aa14985a6ba4da058
font_02_sfnt_off0001becf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BECF 10840 bytes
SHA-256: 5f659db2faef37f3e81b4d492d503e8b100e43b5c60630e1a1cf6c41325f838b

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