Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7691859fe342461…

MALICIOUS

PDF

76.0 KB Created: 2021-07-09 13:32:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 334bab71ae79a6f8d733be353072f656 SHA-1: fc18e6b839592d800723466d986867c060406efe SHA-256: c7691859fe342461b3a09c4dd8f6a31f6c78dbc64d8d19fcb2d65593a1e46260
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV and an ML classifier as malicious. It contains a link farm pointing to numerous external URLs, many hosted on compromised CMS uploads, suggesting an attempt to distribute malicious content or phish users. The document body is unreadable, but the heuristics strongly indicate a malicious link distribution pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://theatresaucinema.fr/uploads/file/nolasemomuv.pdf
    • http://valeneighbors.com/userimages/ketek.pdf
    • http://ekolojikweb.net/upld/userfiles/file/fifiwufonodipamalideloba.pdf
    • https://alternativecarrepair.com/userfiles/file/gopazojuvukarepujiram.pdf
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cbde39ad1af---44986999442.pdf
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/6fpfm7gnsigfp8s5mcn3j26frg/forufamipavov.pdf
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077f5f6040e2---gipugiwubexepufejitujegok.pdf
    • http://mosvag.ru/img/lib/file/gisasarapujiwowimolefi.pdf
    • http://say-international.eu/userfiles/file/wuluguwuzukumedun.pdf
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/6133fc6f2ee9de00c39af47e95a9ef6a/85559315455.pdf
    • http://www.tobywells.org/media/fckdir/file/vugizewis.pdf
    • http://allycatering.com/userfiles/72284227771.pdf
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/19b7180fb4a93cbc5f6e23c99857c6b5/fugijumedozosezozirorux.pdf
    • https://greenlakepaint.com/ckfinder/userfiles/files/77787564970.pdf
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/52ff74c21e48f776053850c45f72c7f4/47780807494.pdf
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/edigvrj2dkcqlddiajqgdt466p/siwudojolojadime.pdf
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/afc4666a0db030b53ab6cdb73f25bb72/puzuvugolugupajeb.pdf
    • http://15thstpresbyterian.org/clients/d/d7/d7025cfb1d4df99eee5a588ecc3dd57f/File/wiwojevulagorobigakuvogi.pdf
    • http://ziconiavip.com/uploadfck/file/wodosutesonugakufewi.pdf
    • http://bonfiremadigan.com/uploads/fckeditor/file/jovutejijev.pdf
    • https://accesoriosalmayor.com/images/userfiles/file/rojilezupisumiduriresuvi.pdf
    • http://minuspk.ru/minuspk.ru/userfiles/file/viseludumulan.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=in+which+province+is+groblersdal
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c717.bin
e81ae94cd64118909de6121b683e52a09ece4d77e91d1b62157a402a71a373a8
pdf-font-stream PDF embedded font (sfnt) at offset 0xC717 16536 bytes
font_01_sfnt_off0000f202.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF202 16792 bytes
font_02_sfnt_off00010a19.bin
5cecce79e3fc902f1c6123b0b01559ac24a338c2d9e4f52c4bf42b219fd60432
pdf-font-stream PDF embedded font (sfnt) at offset 0x10A19 10936 bytes