Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffa13cb379dbedde…

MALICIOUS

PDF

118.7 KB Created: 2021-07-06 02:10:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 57eaa3e49874344113c0d982735f5d80 SHA-1: 8e79469f1ccbef10d371e7e288c73608c051c436 SHA-256: ffa13cb379dbedde30b6e67bb21f2ef5acc3bc9e825720445338ec4e93e80dc9
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites. These links likely serve to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160d02ffd3aa03---42277831284.pdf In PDF document text
    • http://rentaruedas.com/files/others/xufaxemosaliranurad.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd8a07e2a31---fepavegaletipitewetejoseb.pdfIn PDF document text
    • http://93564497.com/userfiles/devomanopubelogivitur.pdfIn PDF document text
    • https://magatek.com/documents/file/wonotijokesulenuko.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/a4cea8homlvd1vim59d8cf6vf2/ripej.pdfIn PDF document text
    • https://lotte-ppta.com/beta/assets/file/23927188846.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/c2ec6950cbe4ce797ff09d76b2a64d31/93452928028.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/69157d142a3a34ceb8cea4714cb7e178/gewebevade.pdfIn PDF document text
    • http://run2endalz.org/clients/2/2b/2b4973775a35d8819257a28a16fdea67/File/tikigorosajemurivadal.pdfIn PDF document text
    • http://fd-health.com/upload/ckeditor/files/61441491418.pdfIn PDF document text
    • https://familienbilstrup.dk/userfiles/file/12341061343.pdfIn PDF document text
    • http://jeremypourstarlight.com/clients/5/53/539822683240d2210db56c0084569a8b/File/tomexeminamiwok.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/29a40ee28b2285d159cd0574850f9a39/zavoxesibutilurorudufi.pdfIn PDF document text
    • http://rchs1964.com/clients/5/58/580abc73d3aac4ea3a2bdd7c75327783/File/94329464566.pdfIn PDF document text
    • http://augustaelectricalwork.com/editorData/file/batave.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/dda8fa1cf5c450abb1c741114b12ebbd/gapiruninufubova.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/b3ebe20012e321f16ccbfa015c9edd22/sakozitekujogeratubejol.pdfIn PDF document text
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/3c6ac6b87b1265493f451367d600fd06/58175373054.pdfIn PDF document text
    • https://bnovum.hu/downloads/83572688515.pdfIn PDF document text
    • http://boracayg.com/FileData/ckfinder/files/20210706_5E81A1DAD2838E0A.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/jesolotesadilavuwiram.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=oblique+view+drawingPDF 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_off00016d59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16D59 18328 bytes
SHA-256: 4dbdc0d45ede2758bf30dd5600beb3eff4ea782e6536f806ea743fff89bbee49
font_01_sfnt_off00019e33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19E33 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001b64a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B64A 10600 bytes
SHA-256: 2dcdf8b178c29af1d48438a73a3c926c48817e7f51616595365ac0e10b6c0e0d

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