Malicious PDF — malware analysis report

Static analysis result for SHA-256 d14a03c563b1b084…

MALICIOUS

PDF

73.1 KB Created: 2021-05-25 04:42:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 164929c1d173687b1fe30bd44ebc67fe SHA-1: 1356cdd00f771701163387d346139461474f1a14 SHA-256: d14a03c563b1b08489a94147fc9b7d5db1fb5b0154c302328b2d5a76cdb55185
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or are part of a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing. While no scripts were directly extracted, the PDF structure and embedded links suggest an attempt to lure users to external sites, likely for credential harvesting or further malware delivery.

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://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/aef96829c87254886c847d0849dc7528/80233507947.pdf
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/bda2f4f35a3a8dc2b10ce5e784b5979e/wefavemagudepepoxi.pdf
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/6a73dc69dceeec4654576b6e27dc52b8/51188571979.pdf
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/e11f4bf1e5191495f9078a03f3c6399c/sodese.pdf
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16098b3ccf330c---vakelejukuzuwala.pdf
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/jhlc6hejm2enpf1a8cve6cujm1/jewimokatafuzumukufez.pdf
    • http://sungsam.net/userData/board/file/komusajaganerep.pdf
    • http://www.aqsclimited.com/EditorImages/file/71600088167.pdf
    • https://alternativecarrepair.com/userfiles/file/nireduminam.pdf
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/1607337dd91486---8750472678.pdf
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609d7147e2deb---kimajo.pdf
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/a6928b778bafd1c6063c3442350cb7d9/46213831010.pdf
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/e219107500e110bc30046a8f107b4bcf/zisefuzunusifijuzeletix.pdf
    • http://absolutelyneon.com/userfiles/file/komuwetolufufidiliku.pdf
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/cf668e813a03ad4dbe491deeb4f3e5d6/xatugujalimajiwenojo.pdf
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080ae99c2756---69876627625.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=present+perfect+past+simple+exercises+pdf+esl
    • 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_off0000df06.bin
add7ff5d2181087766da95117800227237af9a46211eb7b795603d27a2e9e21d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF06 5372 bytes
font_01_sfnt_off0000f139.bin
826824fa9d6ed640a2b58cc23c9729b1f365c0bd9b54b3423a0f58c262edf9ad		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF139 11100 bytes

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