Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e14649064874192…

MALICIOUS

PDF

95.6 KB Created: 2021-06-21 20:03:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 7c3759e7cc22c1c4c5660e0c95f2b85f SHA-1: cc983866a2fb082e4165be5f4506dcbf7ef33ba8 SHA-256: 7e14649064874192b1c9b0752251f0e8d060653e95dce6d8d3b7131ce3682cb9
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, indicating a link farm for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites, potentially for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/1bb5eafb31fabf55484cba0be1b02250/99245549280.pdf In PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8b82ccc61a---gejadider.pdfIn PDF document text
    • http://digemnd.com/UserFiles/file/dedowel.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c521ec5beaa---30108272565.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/b8a1b400832e0148c130b44b0a08c7d4/nazujekebaduk.pdfIn PDF document text
    • https://magatek.com/documents/file/zavuzuxotilosolakuz.pdfIn PDF document text
    • https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/ejgfmjehtdfk6ho4k9ldpl1s67/60226093587.pdfIn PDF document text
    • http://mppscstudy.com/admin/usercontent/file/27534304890.pdfIn PDF document text
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/59c2b8f8a66f9002814843e4f72703d3/mujesak.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/5bba5ace083d90e2faee412bce070bb7/wabuzalafidekop.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/6478df0eafa66956bebd75f1fc5c752f/wegosenifawuvux.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ca7bb7c39f---34707139992.pdfIn PDF document text
    • http://allprintusa.com/admin/images/file/28801755294.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=engineering+economy+16th+edition+solution+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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013892.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13892 5620 bytes
SHA-256: f89c1e3c020dbb459fc6f908a09a760f813d6a0df17c4c5774e5306263be2e93
font_01_sfnt_off00014b96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B96 12464 bytes
SHA-256: 3a7291a628028f3e641bb99e1cdd8f5d2b12f1c5ff57c9a6c206867caae0573d

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