Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a53ade7c92caa2e…

MALICIOUS

PDF

166.9 KB Created: 2021-07-05 07:42:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 85d6f7ff7ff4410bb1f65f1c0ea96284 SHA-1: 2b3fc708fd240b29cca05c744f407930e284a292 SHA-256: 0a53ade7c92caa2e5f18a57448247e46d38a678f9ee6797ff0932012db0aa2fa
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable, so the rationale is based on the URL heuristics and the high-confidence detections.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9939

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 https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/91fd3cc01ad83c3fc673a8c1da291543/waserixanokos.pdf In PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f13d5d6723---68622633802.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/ad7d7b90661f80b15f8f3ba8d34551b8/rewasotujekojuwatalifuva.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/66031591301.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e3610df851---faborigufezomobifa.pdfIn PDF document text
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/e71f6e322896d844b47d0c1d8b476a39/zinuputokozetupidigunefa.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609261354f0d8---46870847149.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/16081426b7faa6---62631560088.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/i8do8b7g6htqnnnntc4l1nnm43/tuvodivofap.pdfIn PDF document text
    • http://yfatc.com/userfiles/file/bakowuvosorolaterudigawo.pdfIn PDF document text
    • https://lesfeesdelhetre.fr/upload/files/46811555051.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/50e6835ad8ff5782833565995b2f7ead/93952741437.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/136f8e561c48abbe13d128571bacf0d7/poporuxuduvodatototevixe.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/98aa74739e8128bca3f2e88a00c180a3/53342525337.pdfIn PDF document text
    • http://okmarin.ru/userfiles/file/pumeket.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b475f2d08d2---kupenevowomakajunetof.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c3605208083---25817245372.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/cfmh584u0khs4ju7qnnfr7pil6/kedusitinej.pdfIn PDF document text
    • https://mfdesign.hu/files/file/pokawinotumipejid.pdfIn PDF document text
    • https://calendarsunrooms.com/userfiles/files/10259275827.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160820fe3eb728---fasumukikuwuxasiza.pdfIn PDF document text
    • http://szpital-sulecin.pl/images/fckfiles/file/76886992740.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=meaning+of+tending+in+agriculturePDF 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_off00022cfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22CFD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0002450f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2450F 19336 bytes
SHA-256: 0b5d929a0c7dc04d4f9e9fad0d0855a8a26a2678684d49c8a89b06050d03982c
font_02_sfnt_off00027718.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x27718 10576 bytes
SHA-256: 5749611305ced8abba1bdf982aff54618f84a3fb6ef746615fbd93100ec663ea

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