Malicious PDF — malware analysis report

Static analysis result for SHA-256 544ff6edd05114e4…

MALICIOUS

PDF

97.9 KB Created: 2021-06-27 09:05:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: aa4b35fcc99f8b384cf2da7158360474 SHA-1: e524355d64ee2f98e6cdfc6a3376e0f3e1b7e168 SHA-256: 544ff6edd05114e4ffb496ffa890eb09ea447835153071e7b5b4e342c15e8408
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised WordPress upload directories. The presence of numerous unknown URLs suggests an attempt to distribute malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ab143c208c1---29155284451.pdf In PDF document text
    • https://esportenerd.com/app/webroot/ckfinder/userfiles/files/58507413694.pdfIn PDF document text
    • https://fokusmedia.com/images/uploads/weludakapilutifimi.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1606d26427d40a---toramuzebirope.pdfIn PDF document text
    • https://strategieb2b.com/userfiles/file/fegewix.pdfIn PDF document text
    • https://sportsht.com/userfiles/file/29872543731.pdfIn PDF document text
    • http://bona-agra.pl/Upload/file/bebitunok.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/eac11b226dd24ff9d46c88562ddd21d8/sagijilijetunijepijen.pdfIn PDF document text
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/bbfd70cc0f31b0e20b3cc52e067770cc/nenazilevide.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/2fe2e0a3061b7b56b280a6ac5e7fbc79/falamoxopujepi.pdfIn PDF document text
    • http://cuatro-pr.org/sites/default/files/file/46586269229.pdfIn PDF document text
    • http://taitung-house.com/CKEdit/upload/files/rodonoze.pdfIn PDF document text
    • http://nhs71.com/clients/d/d9/d9c6bfbc4bbdd207836d30c01fe5869c/File/kizuzajakexorifok.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb744a3cae---42870007366.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb63548ade---guvipuresapawulabe.pdfIn PDF document text
    • http://mai-colle.jp/userfiles/file/sabovivixalezumutexan.pdfIn PDF document text
    • https://atraba-holding.com/userfiles/file/jomoza.pdfIn PDF document text
    • https://henklinders.nl/henklinders/upload/files/nofitibarenipum.pdfIn PDF document text
    • http://antoniolescio.net/userfiles/files/zivedolararewituwemuba.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/d8v70bkffpmb8nen17ri2jrcls/72704470543.pdfIn PDF document text
    • http://wsm.hk/images/uploadfiles/file/76204192425.pdfIn PDF document text
    • https://beaszemin.com/files/lofovaxogisomapoj.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607631f30b7ce---8986663409.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=actus+rea+meaningPDF 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
    • https://rb.gy/7cfqlnIn 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_off00011975.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11975 18288 bytes
SHA-256: a7913ce594baf9734cd5cff24db7aa402f604e5528f3164de3b39396f9cd959f
font_01_sfnt_off0001493e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1493E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016155.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16155 10488 bytes
SHA-256: 4adb1fa22158b0265fa3f097423164e33da39f8dcc90f6c45f6774b9ecb2ee67

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