Malicious PDF — malware analysis report

Static analysis result for SHA-256 970b2a9ecae6de00…

MALICIOUS

PDF

94.0 KB Created: 2021-08-13 12:41:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 987dc096151ea0b5e5a783d850c566e3 SHA-1: fbef1f0499d37e2aca07458d5cff3e184f33671a SHA-256: 970b2a9ecae6de0077fe3850f4b82a93fe3ef47145f97b81a371e362f54739d2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many hosted on 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. No scripts were extracted, but the presence of external URLs and the heuristic firings point to a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://catamma.ru/uplcv?utm_term=thrush+turbo+muffler+installation PDF link annotation
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/57d28082212f62d2fbafd2afdea4fd7d/48935614887.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/9610b3087be22cc90610ad7feac9172c/waputib.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/hbokpe3ikr8ic59ab6r2acu48o/gazugejesewuninisewu.pdfIn PDF document text
    • https://floresdeserrezuela.com/aym_image/files/33000434775.pdfIn PDF document text
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/4dfbcbbd313e34aaaf955e3480ce14c7/41530780307.pdfIn PDF document text
    • https://irantruck.ir/data/file/42644045806.pdfIn PDF document text
    • http://3e-recycling.ru/app/webroot/filesfiles/gasonolagovotis.pdfIn PDF document text
    • http://sheeld.org/clients/d/d0/d021426cee8527c21a172be12ef3d645/File/4172740815.pdfIn PDF document text
    • https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/d3b3fe94c5c1798908f6bace56f577fa/25890097117.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608301d1b06d0---dubepababebanawa.pdfIn PDF document text
    • https://oxfordjsr.com/userfiles/file/semezizas.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/d35e1a1c23efebc5f9d3817df0b1c1db/49776820865.pdfIn PDF document text
    • http://htwy.com/upload/file/visufexonimijekejotojizoz.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/0242fc4d13deabef2ca88445e3df71f7/33167504463.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/nbi60q1ua4fc3942844gp8cosr/32301446010.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/4cp10tc7n72o4riiiq0qcbpi3c/xudimedoworasopuvoz.pdfIn PDF document text
    • https://airshow-bg.com/file/venoxewe.pdfIn PDF document text
    • https://roweryelectra.eu/app/webroot/uploads/file/16213788783211.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/b88e80570824595ef6ab3016a33b8cee/54495159103.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/b22257348ead785e0db8910715774c93/xutesowid.pdfIn PDF document text
    • http://grandwatergatehotel.com/upfile_hotel/files/30957211987.pdfIn PDF document text
    • https://shieldtech.cz/ckfinder/userfiles/files/67859036721.pdfIn PDF document text
    • 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://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010a4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A4F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012261.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12261 17808 bytes
SHA-256: 2ed84f723243c4e7723b476b024a9d7b59073a19367b8b86f2a595de7a21fc2d
font_02_sfnt_off00015186.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15186 10680 bytes
SHA-256: 8dcb578709f6ccfe8549001d8a3bceb7a8910b7629b0ad7222bdf2b72dea9aa2

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