Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fc9e587f964a521…

MALICIOUS

PDF

69.5 KB Created: 2021-05-29 12:47:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d12d9286f7cd4ce475084ca39d99ea37 SHA-1: 420e008d128445b436d7f0e4e28afde4543fdad4 SHA-256: 0fc9e587f964a521d5e40ce1dcceecd1de7681a9ee61a81fefdf16e14ddc6b08
196 Risk Score

Malware Insights

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

This PDF file contains numerous embedded links, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/7fmlpv2i74pij9oqu44t1u6sle/53275734652.pdf
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a414c108b4---76237848053.pdf
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/b29f5736a0b607de0b8543ad971af2c9/sitorisafip.pdf
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/j59fjkj1lc5t7qktf6vtj8trp7/lerogepafufirolixete.pdf
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608430b2adcd4---7257805873.pdf
    • https://mymango.ru/wp-content/plugins/super-forms/uploads/php/files/483346442e15e2daad3bcaca814db4aa/32211989480.pdf
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/q3btpe161b9f4qlnm5q7aiaf70/buxagusuvazarixe.pdf
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16087292249ad7---20845704904.pdf
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fdee528a06---52693081112.pdf
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082cc147dfd7---58250703327.pdf
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e0f35d8967---gonosakowise.pdf
    • https://airshow-bg.com/file/67835020918.pdf
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/qrs2vuvk4f4q1kmkhdol7dq8kl/61453394713.pdf
    • https://pointsourcegroup.com/wp-content/plugins/super-forms/uploads/php/files/6299194217926b8066453631056f2144/dolivuwuvamifebadow.pdf
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/eaece27fa1677fc9a1838b44d5a52026/resijopof.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+make+easy+friendship+bracelets+step+by+step
    • 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_off0000d26d.bin
ef7e13c9249f4f3399a250bb38a28ad4d11649951d0e225cb030eca877cf310b
pdf-font-stream PDF embedded font (sfnt) at offset 0xD26D 5756 bytes
font_01_sfnt_off0000e5e5.bin
03056583c583a0b770959c2e632b666fb3c008205c8d04234962dbcb451a82c5
pdf-font-stream PDF embedded font (sfnt) at offset 0xE5E5 10292 bytes