Malicious PDF — malware analysis report

Static analysis result for SHA-256 44b882941e353982…

MALICIOUS

PDF

75.6 KB Created: 2021-08-30 19:09:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b5356fef990381c2794f4cf32ca8a4f1 SHA-1: ec7d2449cca7cd4be3c631207313a47fbb35f63d SHA-256: 44b882941e35398269aa5b21021a09eb6f3becbd2ed86ebf259d384491d246cd
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous links pointing to potentially compromised WordPress upload directories and other disposable hosting, suggesting a link farm designed to redirect users. The presence of these links indicates an attempt to lure victims to external malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d252ad1fee---71470136660.pdf In PDF document text
    • http://divorce-difficile.fr/userfiles/file/vemafaxagi.pdfIn PDF document text
    • http://leesfeest.nl/leesfeest/sites/default/files/file/jinunapabilotowizuri.pdfIn PDF document text
    • http://mateuszkucharski.pl/admin/file/kepinime.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/la71ckjp5a1hs7sqpebkrouqu4/97644902939.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/vcec5gtlrpl5ilr6f02b2oom26/zunisotevire.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/filmf54p1n91b76monb7r4b5k1/fasoxukirizifotegovogaw.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/20c0b711808678bca8fc17cf36a0e25c/98816618350.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4b38492771---14331896130.pdfIn PDF document text
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/7cdcb991768c9d4b4fe2917f40210ded/rajenimoxo.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608edd7347ca6---kewetovefujepujipibevuxi.pdfIn PDF document text
    • http://peggylittlelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/22183082272.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f4bd8a6db0---figupawimenomu.pdfIn PDF document text
    • http://bearings-home.com/userfiles/file/78147498317.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160e59627dc96e---60948244911.pdfIn PDF document text
    • https://juvelyrikoscentras.lt/Files/file/58822033442.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/29ik00nfcsbltppmnh6enoiisr/52785711773.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f3a0a2f379f---11274729759.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/27528624933.pdfIn PDF document text
    • https://urbanlivin.lu/userfiles/files/fiwujajokajotarasukoga.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/ec286b68cce2aa42bf6f4154cd7d4b05/71196304913.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=bloating+after+eating+anythingPDF 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_off0000c5b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ddcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDCF 10492 bytes
SHA-256: 46743f2f66c6d9e6edb8f2112aca4ae3c9215ea34c5aa0b35ea25ec655089128
font_02_sfnt_off0000f5a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5A1 16412 bytes
SHA-256: e6cb1069cf088513e5e3ee007ae1ec6775a3499cf0202109872f06ed9a555030

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