Malicious PDF — malware analysis report

Static analysis result for SHA-256 44e543d672cc2e50…

MALICIOUS

PDF

95.0 KB Created: 2021-09-02 13:08:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: ecc4afc2b5d51de3676cae5a8c4ec3c2 SHA-1: a5e18329050ae1647442b7a29a10161ff843054e SHA-256: 44e543d672cc2e50d0a27af76bb9a1a9d66299e4512c3ee4354e514bf4cd6bd6
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised WordPress upload directories or other potentially untrusted hosting. The PDF's structure suggests it's designed as a link farm to distribute traffic to these sites, which is a common tactic for phishing or malware delivery. No scripts were extracted, and the document body was unreadable, but the URL analysis strongly indicates a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://b2b-intelligence.it/uploads/file/32734354692.pdf In PDF document text
    • http://babamoleskine.com/files/file/44380928501.pdfIn PDF document text
    • http://www.derbysignandgraphics.com/uploads/file/pinefesinibitowixif.pdfIn PDF document text
    • http://efuegypt.org/userfiles/file/35638162087.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/octeug1mgp0rhu8gmbgpku2vg5/xigodez.pdfIn PDF document text
    • https://dananeye.com/uploads//files/202108101009561859.pdfIn PDF document text
    • http://carneslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kisabefuregugi.pdfIn PDF document text
    • http://xboxheerlen.nl/userfiles/file/jinonuliva.pdfIn PDF document text
    • http://scoutpate.com/userfiles/file/65111888311.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/ks6sobu3oitqia193cjsseqnb3/rivunarasubax.pdfIn PDF document text
    • http://vrtaspol.cz/klienti/devel/sneznerolby.cz/ckfinder/userfiles/files/wiruxovujiwetaxaroz.pdfIn PDF document text
    • http://www.lukoilmarine.com/ckfinder/userfiles/files/bomufoxesamunikebaziva.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/bf7518553d5c3e38f33f63e60b1d5e53/jidezawolinijeku.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/sojatabetodemom.pdfIn PDF document text
    • https://eksiliotomotiv.com/upload/ckfinder/files/69154027419.pdfIn PDF document text
    • http://jakpaisanestate.com/images/upload/files/37214658298.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606d932b3a4a8---wosawetimed.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/72e86fe3b380ebcb01899482b2685f82/80628140362.pdfIn PDF document text
    • http://sankofalectureseries.com/clients/a/ae/ae3037074ff26ae8502dacd236f4ced8/File/soseruvositileb.pdfIn PDF document text
    • https://szaniterplaza.hu/ckfinder/userfiles/files/54554448902.pdfIn PDF document text
    • https://ikincielinmak.com/upload/ckfinder/files/512452221.pdfIn PDF document text
    • https://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a9933234702---53636469535.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=forerunner+935+owners+manualPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0A4 21148 bytes
SHA-256: 35be0a1a61c5c41e761804e0d0af5ad56be87f279ecf7cdca6d55d2e9bee3e2c
font_01_sfnt_off0001276c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1276C 10716 bytes
SHA-256: cc335a40ca1c3fa37aad36584cfb8fd5b994a84f9d06d44a03c36c88cf83e043
font_02_sfnt_off00014022.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14022 16232 bytes
SHA-256: e06ebeaa2bb94d9bf14337b0794fec2c9c4a66e30291689b6f6234bfe360c8a5
font_03_sfnt_off00015605.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15605 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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