Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3df6532778282ce…

MALICIOUS

PDF

84.8 KB Created: 2021-09-12 01:29:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7f2e4d7b80f9ab9280b2921f99a3ddea SHA-1: 614fee42610b35c606578c8ed2f5aa80a6caf729 SHA-256: b3df6532778282ce173c4df9934008505e33f43b91f5986b50e91688f84fb266
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document flagged by multiple heuristics and a machine learning classifier as malicious, specifically identified as a phishing trojan by ClamAV. It contains numerous external links, many hosted on disposable domains or compromised CMS uploads, suggesting a link farm designed to redirect users to malicious sites. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics indicates a deliberate effort to obscure the final destination and leverage potentially compromised infrastructure. No scripts were extracted, but the overall structure and URL patterns strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://allytemp.ru/uplcv?utm_term=best+android+countdown+widget PDF link annotation
    • https://yukkumpulgroup2.com/contents/files/52294605070.pdfIn PDF document text
    • http://brmhn.com/userfiles/file/20210908225338_u12gym.pdfIn PDF document text
    • http://lisaarkinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/88761271924.pdfIn PDF document text
    • http://gulfcoastlist.com/userfiles/file/deselamawunapumo.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613d1b60546c1---75436632153.pdfIn PDF document text
    • http://cartonwrappingmachine.com/userfiles/file/zonamijuxujovig.pdfIn PDF document text
    • http://gospel-pour-100-voix.com/fichiers/newsletter/file/wejativuk.pdfIn PDF document text
    • http://jncs.kr/page_data/file/20210901103050.pdfIn PDF document text
    • http://kamerton.nl/clientfiles/83315332730.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/08ec5f711523d68a8cc264959f921b24/nulav.pdfIn PDF document text
    • http://palazzodiaz.com/userfiles/files/63687535890.pdfIn PDF document text
    • http://brickchamber.com/ckfinder/userfiles/files/lufugamezalivuz.pdfIn PDF document text
    • http://mecaniquekd.ca/upload/file/94892212368.pdfIn PDF document text
    • https://poulinstrapscan.com/userfiles/file/kafoziwixonafep.pdfIn PDF document text
    • http://chineseclothingonline.net/File/rukokuxepujakakij.pdfIn PDF document text
    • http://altinay-law.com/images/file/17785074208.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/susepeki.pdfIn PDF document text
    • http://madiran-cruduparadis.fr/ckfinder/userfiles/files/zatosoja.pdfIn PDF document text
    • http://eko-uklid.com/files/file/49497568060.pdfIn PDF document text
    • http://workontext.ru/media/file/34439032179.pdfIn PDF document text
    • https://nhatngudongkinh.phapluatvietnam.com/upload/ckupload/files/bipuzabulesid.pdfIn PDF document text
    • https://ceccargiurgiu.ro/userfiles/file/pofiwugababota.pdfIn PDF document text
    • http://eachfun.com/ckfinder/userfiles/site_eachfun_com/files/xutizajafabum.pdfIn PDF document text
    • http://ih-consultant.com/ckfinder/userfiles/files/damagej.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/161300887c459c---potitudaluvulevizanof.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_off0000e5fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fe13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE13 10740 bytes
SHA-256: 8e383451b6618e9559b87b213491518f576e473ccf97a29f54f3cb6bd36dba4c
font_02_sfnt_off000116c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116C9 17980 bytes
SHA-256: a93fdd2d5ca09e3bf70cf41946cd48054b88cda58983b46b4b72782c3bb40633

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