Malicious PDF — malware analysis report

Static analysis result for SHA-256 68ce282bae468849…

MALICIOUS

PDF

85.0 KB Created: 2021-09-08 14:20:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c6bd3ffac302228b6cd5369eba63ffd2 SHA-1: c14ecd040e9ca397abdc206ccf9d0eda9f8c26a3 SHA-256: 68ce282bae46884988f80eba5e687952bd5608618ecd3abb019cd69393495a7d
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which appear to be part of a link farm hosted on disposable or compromised domains. The 'SE_CALLBACK_LURE' heuristic indicates the document is designed to trick users into calling a phone number for support or to resolve a fraudulent charge. While no scripts were explicitly extracted, the presence of PDF-specific heuristics and numerous external links suggests a phishing or social engineering attack. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://hoachattn.com/image/files/navexagajawurakeg.pdf In PDF document text
    • https://ichapps.com/ichapps/ckeditor-ckfinder-integration/uploads/files/45756007250.pdfIn PDF document text
    • http://dolphinegypt.net/userfiles/file/5110759618.pdfIn PDF document text
    • https://nutricount.cz/UserFiles/File/pegabojujemoz.pdfIn PDF document text
    • https://caror.hu/ckfinder/userfiles/files/zomepovifegexo.pdfIn PDF document text
    • https://fibra-optica.ro/ckfinder/userfiles/files/tavefizuginuwi.pdfIn PDF document text
    • http://vagtteam.dk/userfiles/Files/kemipubebimisaz.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/c27a596fa098d9bccb06a02cffd9d9cf/gojus.pdfIn PDF document text
    • http://ros-grad.ru/fck_editor_files/files/mozaxatejan.pdfIn PDF document text
    • http://cutskytools.com/d/files/73749291394.pdfIn PDF document text
    • https://cakenflowersonline.com/userfiles/file/80279428121.pdfIn PDF document text
    • https://insolite.lu/img/userfiles/files/dezikuxezotefiz.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16136addfd67ae---77923304716.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613141180b57b---90352018730.pdfIn PDF document text
    • https://chasehr.in/userfiles/file/28545492774.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd9cbec677---97664288093.pdfIn PDF document text
    • https://a-guskov.ru/uploads/files/57132965551.pdfIn PDF document text
    • http://intertravel.hu/_user/file/64801691609.pdfIn PDF document text
    • http://galantemontagnana.it/ckfinder/userfiles/files/dafurozoruzapave.pdfIn PDF document text
    • http://malabarisproducoes.com/arquivos/files/61956057200.pdfIn PDF document text
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/xenevakowozowivurewu.pdfIn PDF document text
    • https://sicurezzaips.it/uploads/file/41336377702.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=indice+de+desarrollo+humano+en+mexico+2017+pdfPDF 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_off0000dfb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFB2 20040 bytes
SHA-256: 58cc2a3c0a2bf8e934d3e30ff54cafcac521586b1e17819e8c33241a3003e3bf
font_01_sfnt_off00011367.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11367 11284 bytes
SHA-256: 289277d998a2a475cce34df7721a0368d9742c9930b0f1a1441630892bb59ce0
font_02_sfnt_off00012dcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DCB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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