Malicious PDF — malware analysis report

Static analysis result for SHA-256 3538a356659460c2…

MALICIOUS

PDF

67.8 KB Created: 2021-06-19 07:59:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f6e29817db13d71a9dff42eb30dd8cbb SHA-1: d25186feead6f48cce1a2bdaff4c754d4799ef22 SHA-256: 3538a356659460c2a7130d88b43fbbbd894aeee04ba35984d0f470dc0095d3c9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF document is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, contains metadata indicating it is a 'Tenses exercise pdf', likely a lure to encourage clicks on the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://laborke.ru/uplcv?utm_term=tenses+exercise+pdf
    • https://ludifrance.fr/userfiles/file/81771126068.pdf
    • http://albino-pitti.com/pub_img/file/17299348884.pdf
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c2906d8a1f3---52390641296.pdf
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/clo92hkpf4fnj1jpdfv5u7qc52/bifirenon.pdf
    • http://saharun.org/uploads/ckfinder/userfiles/files/gusiridopugi.pdf
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a44f58349c1---rinugubu.pdf
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160986a23e4012---pepapakagab.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac948c38644---91909535652.pdf
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/k87tskpu3r9khvehl54m73m0u4/dojiburusofe.pdf
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a06de34694a---6442929066.pdf
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc63a6667ae---68697983287.pdf
    • https://paron-rebondir.com/uploads/files/foxufadategefasinam.pdf
    • https://alakharia.com/public_html/userfiles/file/kagobebemozeb.pdf
    • http://urbanconstructions.org/images/uploadedimages/file/wilalolopujoxa.pdf
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160796e1c1ab04---fodanifogewaz.pdf
    • https://handientu.vn/userfiles/file/kaxoweje.pdf
    • https://www.reachcast.ca/wp-content/plugins/super-forms/uploads/php/files/6fc51ac4282c4c5bac7fa1b3ee1da8e8/49287144070.pdf
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084c9d1a9e04---povipoxaduwisevas.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ce69.bin
aa92d1cbba8dddb9edd48a4fbf000de3d2932905dcb12c070cded22cd0d4dda2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCE69 4924 bytes
font_01_sfnt_off0000df44.bin
5a4778e7f08ca7a42cb8388ae00dde6b03b284d5f90c8b03ab8e104a030792f8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF44 10340 bytes

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