Malicious PDF — malware analysis report

Static analysis result for SHA-256 931a8c5333ad9907…

MALICIOUS

PDF

75.2 KB Created: 2021-09-20 17:17:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5c2b4644c1c2e28e9fb97e21f72b3f68 SHA-1: 6ace3436aa6110d657d7f04c5581aff096a276f4 SHA-256: 931a8c5333ad990775ee945af7146e0b1f4c93559d4e0059672c307ea5ec0595
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains multiple heuristics indicating it is a link farm designed to trick users into downloading malicious content, with a high ML score and ClamAV detection confirming its malicious nature. The presence of a visual download button and callback lure suggests a phishing or scam attempt. The document leverages compromised WordPress uploads and disposable hosting for its malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

Heuristics 8

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://krisoc.ru/uplcv?utm_term=pop+slots+hacked+apk+download PDF link annotation
    • http://parateam.cz/file/vinesowa.pdfIn PDF document text
    • http://mebizstekla.ru/userfiles/file/fakito.pdfIn PDF document text
    • http://apisicul.com/userfiles/files/vupipelojamur.pdfIn PDF document text
    • http://autodilykanka.cz/cmsimple/images/file/41416074618.pdfIn PDF document text
    • http://tsrmvolontari.it/userfiles/files/golufutavesil.pdfIn PDF document text
    • http://inoxbienhoa.com/upload/files/papubefo.pdfIn PDF document text
    • https://ylwlgwadmin.ylwl.cn/upload/files/vidazowusorux.pdfIn PDF document text
    • http://biurod9.pl/public/userfiles/file/94543830845.pdfIn PDF document text
    • http://phukiendoxe.com/media/ftp/file/derozanibitebisapexo.pdfIn PDF document text
    • https://makenie.com/upload/files/88980197140.pdfIn PDF document text
    • http://pokorny-podlahy.cz/UserFiles/File/lagekovanexozej.pdfIn PDF document text
    • http://vivaibonomo.it/userfiles/files/48836273217.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161469a7c30367---79372557107.pdfIn PDF document text
    • http://csc0851.com/userfiles/file/20210905002719_u29bz4.pdfIn PDF document text
    • http://ntep2008.com/UserFiles/File/xatuzab.pdfIn PDF document text
    • https://damiel.eu/userfiles/file/vowava.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/7dcpkt3l0e56uc3sjl1f37lbcf/7090058631.pdfIn PDF document text
    • https://ana-jsc.com/upload/files/58671879780.pdfIn PDF document text
    • https://karlholmbygg.se/UserFiles/files/32926451744.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/t3iv97jppp1g715mc81f1il9d3/15271538704.pdfIn PDF document text
    • http://ingegneriarossi.it/userfiles/files/jidejatumi.pdfIn PDF document text
    • http://livelyway.com/ckfinder/userfiles/files/mariradi.pdfIn PDF document text
    • http://savages.lu/imagesRTE/files/58984433899.pdfIn PDF document text
    • https://peiitw.com/Upload/ckeditor/files/zemuxepobad.pdfIn PDF document text
    • http://1-sanya.com/blog_images/blog_/file/dorukipivulolo.pdfIn PDF document text
    • http://mamnonsaokhue.vn/app/webroot/files/ckfinder/files/talagigadexa.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_off0000bfbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFBE 17508 bytes
SHA-256: d27fa3ba0068bff34c5079764555131034d44673e16732b96a4853bc1568ab6d
font_01_sfnt_off0000ed38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED38 10600 bytes
SHA-256: f1ffffeb4678dd70001596b9a4554e1383d9231679b772bc35290c825f046b3c
font_02_sfnt_off00010589.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10589 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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