Malicious PDF — malware analysis report

Static analysis result for SHA-256 e54f9058d9a0aa77…

MALICIOUS

PDF

80.8 KB Created: 2021-09-06 20:07:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: d2d1cfb65321c3e9829fd395571c2da0 SHA-1: 9871771d94993af7782e1d8c21cdcf1a154e693a SHA-256: e54f9058d9a0aa77b92a116fc1201edab8775b2992e19cd932fd2fd205c07e6b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://catamma.ru/uplcv?utm_term=citalopram+%28celexa%29+davis+pdf PDF link annotation
    • http://hanmih.com/userfiles/file/20210724110045.pdfIn PDF document text
    • http://beiks.info/public/file/40535516210.pdfIn PDF document text
    • http://highspiritsmusic.com/ckfinder/userfiles/files/kizadozipizibe.pdfIn PDF document text
    • https://regiefranchet.fr/userfiles/files/sulinotexuse.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/q0aj5jv8h3hgi738fqcv09mf5f/losidira.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/bcfdad55e1bd0a68eb69a01e1d8a04fb/lixezelijizaxumaka.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607a348bd4253---zinorobitovojaxuto.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/dcdff7fea941dad8c42f77374bf40cfa/sitewikivix.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/3b1e6e98ac6b3c6b86e31030487f4eba/57963042042.pdfIn PDF document text
    • http://fecoil.com/userfiles/file/37921419325.pdfIn PDF document text
    • http://www.aragonemprendedor.com/userfiles/files/5674516954.pdfIn PDF document text
    • https://fablab808.com/nbloom/fckuploads/file/dajadaxulutuwu.pdfIn PDF document text
    • http://xn--49s538bo8ux8c.net/userfiles/file/64663119382.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/16077b0a3a930a---perorosogelefidu.pdfIn PDF document text
    • http://duepassidalcentro.it/userfiles/files/ximexofonaxunedowezi.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/lidovilisevirogakaxijo.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16086e46b654f5---kisejaxevewojabufavuvefa.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/16087d4146ed41---20587630174.pdfIn PDF document text
    • https://ozsersogutma.com/upload/files/61906354785.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16126e9e65adb6---83226455664.pdfIn PDF document text
    • http://metalltechnik-kutschi.at/pikisatug.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/032cd4cc66f018ddc55457e9cde1dd84/84308367059.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611a3909e80ea---96127227413.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_off0000d45b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD45B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC72 11032 bytes
SHA-256: a90fa31915e34e8e367f9477dcde40d163de032697f7e23fe6b402b73821bf5b
font_02_sfnt_off00010655.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10655 18212 bytes
SHA-256: c25ac90601c336cd7c4b351aadaed7abdef6339471e4595a79ece9cfadaa35d6

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