Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c016dd806acaf1f…

MALICIOUS

PDF

85.6 KB Created: 2021-07-23 10:34:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 08d7bf8c6bc01f1719eaa64be0b77915 SHA-1: 466f2627cf013625fe2bd7aace4377e1d202d9fe SHA-256: 2c016dd806acaf1f7304b480e8d6518bcf0575c2ee49685e90de241f17f30a36
184 Risk Score

Malware Insights

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

The sample is a PDF document that contains embedded JavaScript and numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains. The 'SE_CALLBACK_LURE' heuristic indicates the document is designed to trick users into calling a phone number, a common tactic in callback phishing and tech support scams. The ML classifier and ClamAV detection strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 8

  • 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) documents that carry no urgency or charge/dispute escalation.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://kraski-chernila.ru/resources/file/42175076200.pdf In PDF document text
    • https://bawaniint.com/ckfinder/userfiles/files/jozumusiwejijesomunez.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac8c1f824b8---fexavupasalowizumivesod.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ae68a8d2554---rutalelirogidoxidusun.pdfIn PDF document text
    • http://vamaconsulting.sk/userfiles/file/dozefikogofew.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160984dd6dc9fc---gebomewigotaw.pdfIn PDF document text
    • http://niengrangchuyensau.com/upload/contentFile/file/sibolovopelavujus.pdfIn PDF document text
    • http://star-transform-moscow.ru/uimg/files/96850039513.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071fcf0cd191---wotitosuxegevoxofuveva.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/396db1cfa059edb28a23fc9c4413cdd0/74836764782.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/isinkiicsi7vhih51qhj2dahp4/murebosolawejavagadavi.pdfIn PDF document text
    • https://kalitelivideoizle.com/resimler/files/guvemavuka.pdfIn PDF document text
    • https://itandem.net/ckfinder/userfiles/files/60587036225.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/160851599b7130---84867380293.pdfIn PDF document text
    • http://jsdarvin.com/files/72757649404.pdfIn PDF document text
    • http://bkdesign.ee/userfiles/file/gimawanuzojibuvajuxipaxo.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/fe6a175e983e135bf514cfeed61c3bb1/74823865854.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/b8e13c6c3663f5b90544900ff6612b52/65309617151.pdfIn PDF document text
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084b5c5536fe---79497207615.pdfIn PDF document text
    • http://viacaosaopedro.com/www/js/ckfinder/userfiles/files/19599773556.pdfIn PDF document text
    • https://alutat.com/data/file/jemenil.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ee66fcb0c22---devuf.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1607d1ee318f57---kukibapomisasuleso.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/takajiwovovil.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=proper+nouns+common+nouns+and+capitalization+worksheetPDF 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_off0000e876.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE876 17824 bytes
SHA-256: ccee0b86afdca277de4b18b2f93d84943641adbea1d30b3911010cfae7323285
font_01_sfnt_off000116e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012efe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EFE 11116 bytes
SHA-256: bd9267dff75515e32ee2c99019657e5b1c58466c6aeb4386adeb79f5ebc9bfdd

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