Malicious PDF — malware analysis report

Static analysis result for SHA-256 21a2aeb8d681d602…

MALICIOUS

PDF

84.1 KB Created: 2021-07-15 13:46:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 13813be09007407cee4d7b7e764d6e2a SHA-1: f7990466c29a12bfa406f1c4afb46f4a94189503 SHA-256: 21a2aeb8d681d602e46ed404d5f3583eabcff5ea9e5b36fcc85ce2da5b5aa056
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a phishing or callback scam. It contains numerous links to compromised CMS upload storage and disposable hosting, suggesting an attempt to distribute malicious content or redirect users. The document body, though heavily obfuscated, is consistent with lures designed to prompt users to call a phone number for fake support or billing issues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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) 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://crewmak.ru/uplcv?utm_term=greenville+tax+collector PDF link annotation
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160759db755c31---32135744602.pdfIn PDF document text
    • http://eco-versute.com/app/webroot/ckfinder/userfiles/files/52557966762.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/16090f3e992da1---89006770351.pdfIn PDF document text
    • http://iehyun.com/editorupload/file/kaputogodop.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/55850082450.pdfIn PDF document text
    • https://fajndoktor.cz/images/file/files/47975313675.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c4bc03e9d2---disunetamiz.pdfIn PDF document text
    • http://rexant.by/upload/editor/files/nenapulanu.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607a64a957b5c---83162652961.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6217ec32b7---28832649891.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/jhijo3d2imediko1r9ds1thbtv/13293625378.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160838f0142ab5---tefuwoluzuvotupiga.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/kfrqukcab9bjeonppta1boimv4/vexexefefuraremokegeli.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/4059d2211ca69f8b9560d55d47c26f8f/poxukip.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16078286de9a44---nawugatubudufuvogubij.pdfIn PDF document text
    • http://www.agenbenangbandung.net/file/lidutep.pdfIn PDF document text
    • http://j1medical.com/uploaded/file/8188546849.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/160d328fdc538e---62148634718.pdfIn PDF document text
    • http://xn--xhq021fvrwdth.com/d/files/47431370447.pdfIn PDF document text
    • https://www.brightfieldbusinesshub.co.uk/wp-content/plugins/super-forms/uploads/php/files/54fpshlg6ic1qldcg3ap2sbb8c/68942663414.pdfIn PDF document text
    • http://abwlanham.com/uploads/files/verozomumizaferuruveli.pdfIn PDF document text
    • http://hart-metale.pl/gimnazjum/userfiles/file/pefawule.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/he05fuvs0e4v791j91gqb065um/durisuvinugatironom.pdfIn PDF document text
    • http://mcgrathpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/65803488368.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_off0000e3b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3B7 10264 bytes
SHA-256: 88e06005eec8b80c0b7c5c6c5a77fa5d03f48f0e3f6ee7eb4aba982019691648
font_01_sfnt_off0000faf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAF2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011304.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11304 17672 bytes
SHA-256: a5553b80075712dea07e56a7ba58ec49a4427610d6563086d38a23e0da4265d6

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