Malicious PDF — malware analysis report

Static analysis result for SHA-256 479b2c8db3bcf1e8…

MALICIOUS

PDF

82.2 KB Created: 2021-09-18 13:36:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 81cd91261678abe3aa9d434b9b661109 SHA-1: 90379d89b52cdc05f8bc1ca5dde0214e8b121aa5 SHA-256: 479b2c8db3bcf1e80509a0db8eb9445bf1f8494a25d098c84defe87b1c9587e7
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS platforms. While no scripts were explicitly extracted, the nature of PDF link farms often involves embedded JavaScript to facilitate redirection, suggesting an attempt to deliver a second-stage payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 http://aquitaine.annuaire-regional.com/ckfinder/userfiles/files/14287904935.pdf In PDF document text
    • https://sayurmateng.com/contents/files/wemotomajav.pdfIn PDF document text
    • http://e-photo.lv/ckfinder/userfiles/files/zumomagaxapefepesezepum.pdfIn PDF document text
    • https://thanaclusterwestgate.leaddeehub.com/userfiles/files/vonidibapikazo.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/e9ce75b9c0f7e9ac54cd860b530e6e02/31458176180.pdfIn PDF document text
    • https://specializedfacilitymgt.com/public_html/userfiles/file/vepunuzamatapasazaxer.pdfIn PDF document text
    • http://galettedesrois.eu/userfiles/file/60407398246.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1612f5c45f09d8---22576878457.pdfIn PDF document text
    • http://ppfi-online.com/userfiles/file/41427113753.pdfIn PDF document text
    • https://b2cexpressdemo.com/userfiles/file/57109883353.pdfIn PDF document text
    • https://brianhigbielaw.com/UserFiles/file/pitepoluwusetujofijalorus.pdfIn PDF document text
    • http://studiotravenzolo.it/userfiles/files/45273368066.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613406201ee9c---29836119686.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/04d11dc8ceb156dbf2d33bd1afef55d2/94183362201.pdfIn PDF document text
    • http://irvinenott.co.uk/ckfinder/userfiles/files/butepulezinotefixara.pdfIn PDF document text
    • https://kolkatanagariksammelan.org/ckfinder/userfiles/files/vazebidekixotavagekan.pdfIn PDF document text
    • http://nasledie-sluck.by/var/upload/file/79523918586.pdfIn PDF document text
    • https://gencshoworganizasyon.com/upload/ckfinder/files/gubinowewetemut.pdfIn PDF document text
    • https://www.alapan.org/fckimages/file/52709044254.pdfIn PDF document text
    • http://cpghollywood.com/userfiles/files/81483948574.pdfIn PDF document text
    • http://vladekoservis.ru/files/mopegupagajabalodenuwopot.pdfIn PDF document text
    • https://wspaperbag.com/userfiles/file/19177452135.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=gi+joe+rocky+balboaPDF link annotation
    • 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_off0000de05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE05 10368 bytes
SHA-256: e4ade40330ffccc843330bafff40db3713adbdb7f0b1c39ac0ae9ebfecd56226
font_01_sfnt_off0000f589.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF589 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D9B 17784 bytes
SHA-256: ceefcccb3b515b3e107d6d04a12f4674cb78db98a70afd3db5196a309578a6f0

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