Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ff41b1cc99bc2d5…

MALICIOUS

PDF

87.7 KB Created: 2021-07-31 01:55:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 95ed76f2dd4eb5229d525263d1ba0aa0 SHA-1: bf92b8ca8b455aa03cefd3c4efc1e6b66cdc2981 SHA-256: 3ff41b1cc99bc2d5c194c700e95d849aa6f177590e68f37c417e7fa5f9cf7370
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan distribution attempt. It contains a link farm pointing to compromised WordPress upload directories, likely serving as a lure to malicious websites. While no scripts were explicitly extracted, the presence of PDF_ACROFORM_BUTTON and PDF_URI heuristics suggests interactive elements that could trigger navigation to these external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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.
  • AcroForm button with action trigger low PDF_ACROFORM_BUTTON
    PDF contains a /Btn form field together with a SubmitForm/URI/Launch/JS trigger — this is the building block of fake 'Download' or 'Open' button overlays used in PDF phishing lures
  • 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://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/9e1d470849053bdd5aab7ffb60941fd6/39620266920.pdf In PDF document text
    • https://anandamsanyal.com/userfiles/file/31150297521.pdfIn PDF document text
    • http://ebbers-schilderwerken.nl/uploads/files/49655585942.pdfIn PDF document text
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/68543156326.pdfIn PDF document text
    • https://www.proctoloji.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b51ae29200---56630748351.pdfIn PDF document text
    • http://bizbecho.com/pa/trainstation/uploads/image/file/18755241228.pdfIn PDF document text
    • https://oddluzanie.net/userfiles/file/ninadulepomadepimubi.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073c922df4f6---ruvofubamodemozup.pdfIn PDF document text
    • http://teraval.cz/res/file/wulizafigazolopimiwad.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/7413b59f0e34c1857e3736a3ee400113/letezip.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607da52a7e096---kenufag.pdfIn PDF document text
    • http://belloverde.net/emailer/file/65228268074.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/1608216fd4ed31---mikeluxutupi.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bca6945521f---4446106795.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/rifiwevapisekir.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc025ac503e---zomakesavisemeraro.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/0b98507b244e83cb13b8a96d14c58e0f/vilasofa.pdfIn PDF document text
    • https://angelsstaff.com/uploads/file/98801416341.pdfIn PDF document text
    • https://damiel.eu/userfiles/file/75245196015.pdfIn PDF document text
    • http://garderoba.sk/images/_file/727595848.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609fd903d1a49---mumikigux.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d5111b9633---pafibovodasawipo.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/9827da5202ca738980069588227c329b/vuviwumakalob.pdfIn PDF document text
    • http://mea-travel.pl/userfiles/file/kovisatemesatibibenurut.pdfIn PDF document text
    • https://srldirect.com/ckfinder/userfiles/files/pikovosopije.pdfIn PDF document text
    • https://www.andrecampbell.ca/wp-content/plugins/super-forms/uploads/php/files/01f67001975c97773ab28c3922a405b6/rowag.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=30+verbos+irregulares+en+ingles+en+presente+pasado+y+participioPDF 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_off0000ede5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE5 18260 bytes
SHA-256: 1d0ad8c96acf5d72e3b9f1f8a5bdcfff4c595ce1069a81082a736e36fde0141a
font_01_sfnt_off00011b96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B96 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000133ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133AD 11304 bytes
SHA-256: db5e2a6bf28c2d2819254044b7a2026de4baf6c9aa6d43db75c4659155e360c1

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