Malicious PDF — malware analysis report

Static analysis result for SHA-256 43e5acc785652d90…

MALICIOUS

PDF

91.0 KB Created: 2021-09-07 23:59:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: 430a45aa615440f1cd7b60be78aa7d9b SHA-1: f97b9ddc6a9391da344ff770a5b92ae7eea4105b SHA-256: 43e5acc785652d90369eabe6ac5b3a1ede4e64ae4ac7ae36f5a524220fff8967
156 Risk Score

Malware Insights

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

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 websites, some hosted on compromised CMS platforms. The presence of numerous links, including those with 'utm_term' parameters, suggests an attempt to drive traffic for malicious purposes, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://woodbridgeabw.com/uploads/files/71102612365.pdf In PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/hgidm3dii58448ed735kmrfc81/65568693244.pdfIn PDF document text
    • http://vrtaspol.cz/klienti/devel/sneznerolby.cz/ckfinder/userfiles/files/turanujodejugi.pdfIn PDF document text
    • https://vienhung.com/webroot/img/files/43433564711.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/69c3ee5d7858f1dfb65158db5447953c/wemugefuwodulanu.pdfIn PDF document text
    • http://kubablimel.pl/Image/files/98410281962.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160890fb3ea6ef---32479594195.pdfIn PDF document text
    • https://webmenuplus.com/images/file/38860099307.pdfIn PDF document text
    • http://hidramaco.com/files/files/42788807892.pdfIn PDF document text
    • https://portugaliaimagyarok.com/ckfinder/userfiles/files/20305261379.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/3vlj8app6qou7tu4nag2t8hksj/pukigexasi.pdfIn PDF document text
    • http://unicorn-furnitures.com/d/files/62934068487.pdfIn PDF document text
    • http://xoblates.com/clients/e/e0/e08cfb93fb97b00c28394d0532709dc9/File/3166261564.pdfIn PDF document text
    • http://branpc.in/ckfinder/userfiles/files/benagapovinel.pdfIn PDF document text
    • http://cosyromania.com/media/file/90160125562.pdfIn PDF document text
    • http://envisystem.com/upload/userfile/files/xisiraromebanapajofoba.pdfIn PDF document text
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/439225fe04b1193c7a7a4fb9e9fee771/lenabuset.pdfIn PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a46df80e692---81128605426.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/kusigijonat.pdfIn PDF document text
    • https://okud-istra.hr/userfiles/file/kojatoxe.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b33fb2b3a2b---viroguxox.pdfIn PDF document text
    • http://pobierzplik.pl/uploads/files/vawepipizip.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=global+distribution+system+pdfPDF 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_off0000fd26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD26 11052 bytes
SHA-256: 5cb0effc0fda623ab7e0f271743413a28ba545b0b303334f53ee40bec91ecd13
font_01_sfnt_off000116b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012ec3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EC3 18220 bytes
SHA-256: 6895550ce936d40d3fcc430e9dad42b76775d47ad46ba4d378abb061a9c0484c

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