Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f697f226dbd0a06…

MALICIOUS

PDF

69.4 KB Created: 2021-05-17 08:29:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c07bd12bf8441bc52980722b36a59592 SHA-1: 777355a74d2f596ab7b13af682364349d9d3385a SHA-256: 9f697f226dbd0a067b6cea57a7c94170baa678289301255666b22b525bb72a52
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to compromised CMS upload directories, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 https://smidgel.ru/uplcv?utm_term=zhiyun+tech+smooth+q+manual
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1607b818e096f9---vezasad.pdf
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078ac5012537---gosajetemujaj.pdf
    • http://lubrifianti-auto.ro/files/file/30185614065.pdf
    • https://nevisnews.com/userfiles/siviwukebawelasagojuvepe.pdf
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/11a233f807776bfcdcb9c58ab76d0a43/pazilifixepofimejawuwiloz.pdf
    • http://szao-spb.ru/images/news/file/23606172121.pdf
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160945bf95eb89---tazesigogivojoku.pdf
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/vd3ech6mhiru1g952nto19ad67/2477280561.pdf
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/3fjsn2abs7j7l8ltol667lm7ci/2033209506.pdf
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/6f6244d7176d0ff3437ee70ea466c7b4/vabeligimenunagunob.pdf
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/d5pujgvlu7er9334q2tgi013ga/vibof.pdf
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/ad41ab262cebc3e082ff48805394d086/83307093979.pdf
    • https://ktmcollege.org/public_html/userfiles/file/43253539674.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_off0000d1d8.bin
ea83385ca98850996323ff844795bf6c5af317006305c809baaf2a14513b14d4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD1D8 5128 bytes
font_01_sfnt_off0000e336.bin
d2b337d21112333ccd26a78da85390c2c1e32301a086dea59f0e2a929ff9eca6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE336 11228 bytes

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