Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cfb38ac9f2e52a7…

MALICIOUS

PDF

76.5 KB Created: 2021-06-10 07:55:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bf447f5bc32813a7d88ae8303e557e30 SHA-1: 1e30eebf494f48941c17baef4b108820e4c8efe4 SHA-256: 5cfb38ac9f2e52a7bbe756c1a5f4ce57264bdffc79537cf963d61486f378da4d
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document body is heavily obfuscated, preventing analysis of specific content, but the overall structure and URL patterns are indicative of a malicious lure.

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://irlanc.ru/uplcv?utm_term=avatar+the+last+airbender+book+pdf
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082be2081fd9---34962497432.pdf
    • http://guides2alpes.fr/uploads/file/66508318203.pdf
    • http://boothbayharborshipyard.com/userfiles/file/pepuwigerevasumijopavi.pdf
    • http://africa-emergence2019.com/userfiles/file/97162511364.pdf
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c68e979451565be3d40752762c3c2a64/792202232.pdf
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/usrhhgnun5cgo2h3oooc3i7h3h/fedadoxuxilekalax.pdf
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/27d674007d986b2aeb0d66106f3c49f0/67660599059.pdf
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608802051e1f6---wopimedojidosijekexereme.pdf
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/9dd42b26a31b8fa3b4200ace2be3725b/86374289535.pdf
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/355192bdb33a26c1d9ac2860fcc9bd3a/zapozixodexiva.pdf
    • https://an-professional.ru/img/files/file/fezofejakubanizejuwog.pdf
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/d3eaaac4e0f5a10ff4306c748be847cd/lisadasakitewaniso.pdf
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/hjj5ls4q3iplq07dbi2ngoosn7/bajopataroluridapona.pdf
    • https://advantagelic.com/singhania/downloads/file/60179302791.pdf
    • http://hk-dcc.com/wp-content/plugins/super-forms/uploads/php/files/ljenule1927bqirob63tqtir2i/581670609.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_off0000ee22.bin
8fa8370dec731d6cd9e5e283c60cc16f9078ef7c4801d384c897fac29dcb31ca		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE22 5380 bytes
font_01_sfnt_off0001006c.bin
80205350a5d95b6a114442fc0f6cb822bee55957bf43d5ede7b4b6ea978003c7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1006C 10644 bytes

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