Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d8a8fb6eeb5fd78…

MALICIOUS

PDF

90.0 KB Created: 2021-09-12 13:53:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 979126f4de259dd3f469de5b83d165c3 SHA-1: 8973c4502d9067e466c677aa0597c2e8958824af SHA-256: 8d8a8fb6eeb5fd78a2e94fcc7d6e37a5e50572408e765e22b83a10101f839fa4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, with multiple heuristics indicating it's part of a link farm hosted on compromised or disposable domains. The PDF contains numerous external URIs, suggesting an attempt to redirect the user to malicious websites. While no scripts were explicitly extracted, the nature of the URLs and the detection names point towards phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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=movie+app+watched PDF link annotation
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c5a894bdaf---lexipumilufig.pdfIn PDF document text
    • http://doubler-son-capital.com/photos/files/98794016328.pdfIn PDF document text
    • https://netcsemege.elelmiszer-hazhozszallitas.hu/ckfinder/userfiles/files/dabikutogamor.pdfIn PDF document text
    • http://ltmetal.com/userfiles/files/xufukevodigepudifoj.pdfIn PDF document text
    • http://medrea.ru/upload/files/puligoxet.pdfIn PDF document text
    • http://sovaimm.it/userfiles/files/73847941481.pdfIn PDF document text
    • https://multimetrics.com/ckfinder/userfiles/files/xefowalanosimabugitidiwov.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/ag2emi2fcrmror1migjctj7uec/lasapomubaxilozubajo.pdfIn PDF document text
    • http://siripanyalamphun.com/user_img/files/seforoj.pdfIn PDF document text
    • http://cu-hinothai.com/ckfinder/userfiles/files/44746635200.pdfIn PDF document text
    • https://ketex.com/trcgp/ckfinder/userfiles/files/78323894094.pdfIn PDF document text
    • http://lovelyspa.net/ckfinder/userfiles/files/75845461137.pdfIn PDF document text
    • https://wic-net.com/userfiles/file/42865451799.pdfIn PDF document text
    • http://cheniou.handysociality.com/upload/files/7796897566.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161387607cc4d7---57645923530.pdfIn PDF document text
    • http://kimsanghun.com/upload/userfiles/file/2021921651360415.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/559e5ed0fde5bcdbffafb391ef1faa04/siraxevofijavoleli.pdfIn PDF document text
    • http://agierresrl.it/userfiles/files/sijefivirefopa.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16133573deabb8---pevojamezexone.pdfIn PDF document text
    • https://kaktutzhit.by/uploads/files/65176658175.pdfIn PDF document text
    • http://studiomontironi.eu/userfiles/files/vezidojosa.pdfIn PDF document text
    • http://runnersavezzano.it/public/userfiles/file/sigetowunotepul.pdfIn PDF document text
    • http://clairerolo.com/userfiles/file/58767092889.pdfIn PDF document text
    • https://yumasri.com/assets/ckfinder/userfiles/files/gunisesuluweju.pdfIn PDF document text
    • https://elperrocallejero.info/ckfinder/files/mamuwuxidumegugem.pdfIn PDF document text
    • https://clubelsendero.com/img_pag/file/27010086797.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_off0000fd3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD3B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011552.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11552 10340 bytes
SHA-256: 63a1921c7208962bf95f9dda1c90db817f10e8dd4cf0eedc82446f6a1cea7077
font_02_sfnt_off00012cdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CDC 17860 bytes
SHA-256: 857259427abfc2077657980544329114388eef8fce2f0fdd393a842752dabb32

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