Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a9b371b35721a28…

MALICIOUS

PDF

88.7 KB Created: 2021-07-30 13:10:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0710328078e1452f66afca1cb3b7a57f SHA-1: be3d18b544f7c75962b618847322511059e87ffd SHA-256: 8a9b371b35721a28c906947166d4c1d1d069ce7110b4392babacb5297dc092d7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to compromised CMS upload directories, indicating an attempt to redirect users to malicious sites. The file's structure and the presence of these links suggest it is part of a phishing campaign or a malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://phenix-security.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609412c965233---zizoresufemodeg.pdf
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/msoilsdpdraijbh8k09qejtf73/gofewebi.pdf
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071c2dce2949---wabovabimefamufusezo.pdf
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1b43235876---70322360408.pdf
    • http://kokalietudarbnica.lv/files/files/wazasasen.pdf
    • http://softwarefactory.nl/images/file/figetipimulepexana.pdf
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607be34c8cb6e---81314730822.pdf
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160bddf2f36bd1---66424778236.pdf
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160abb19c9bf54---sebuj.pdf
    • http://ahkjt.com/upfile/file/89897812610.pdf
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/v04426abdiv7ls4irh3umn5vqd/4191500722.pdf
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bb5af7399f---lilixirisafanujugo.pdf
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/160cfb65d5e3a2---muzajupalezoxegonigu.pdf
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb4d2b21219---56813364175.pdf
    • https://malashealthcare.com/userfiles/files/zevasajumisipanofat.pdf
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/6d91770536339d91bf9443ee902538f5/4678217611.pdf
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/5j5201aeiil3iqvlkveubm1a48/21855554586.pdf
    • http://animationcoach.com/userfiles/file/rurofi.pdf
    • http://painttechvina.com/webroot/img/files/nujobesikolatet.pdf
    • http://asea-admin.com/_userfiles/file/20210620013103.pdf
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/161038410b5e2f---xibipepufumedipa.pdf
    • http://d4storonto.com/clients/e/ed/ed023a0734c265ca673a92d1d81de675/File/kaxososinojalusine.pdf
    • http://impactpluslearning.com/ckfinder/userfiles/files/sovuvoximofu.pdf
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee493dbe69b---bemapuv.pdf
    • http://kag.fr/userfiles/file/vutajamopudipojixez.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=how+to+connect+to+plantronics+plt
    • 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_off0000f3de.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF3DE 16792 bytes
font_01_sfnt_off00010bf0.bin
ff4ff1eb6ae816339e363f7954c1e48b8abff85ab9751ddd9a5301519fbfb6cf
pdf-font-stream PDF embedded font (sfnt) at offset 0x10BF0 17556 bytes
font_02_sfnt_off00013a6d.bin
b344ad4e04709d7aa52390ec5b656e39153a9439eab4033832dbd387a72493c7
pdf-font-stream PDF embedded font (sfnt) at offset 0x13A6D 10444 bytes