Malicious PDF — malware analysis report

Static analysis result for SHA-256 1584bd8e6c557719…

MALICIOUS

PDF

107.3 KB Created: 2021-07-02 00:33:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4cc995f39f9f9c5b0285fe37c31e92a4 SHA-1: 3b52b0d41efcec665e7652a6a03d39fbc9635b62 SHA-256: 1584bd8e6c557719934e3442d1ff58d23c8df0cff8e673de56bd469374f54b34
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a link farm or phishing lure. The document body is heavily obfuscated and unreadable, but the presence of embedded URLs and the nature of the heuristics strongly indicate an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

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://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/oqevvuph221p0vfvm9fno19k8k/42934306983.pdf
    • https://acrgroup.nl/userfiles/file/mevalixipo.pdf
    • http://mini-garden.ru/userfiles/file/19499352458.pdf
    • http://ashioke.com/images/library/File/netojalotibamokutukupir.pdf
    • http://actlogistic.vn/upload/editor/files/58513525892.pdf
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1609ec79c43224---xewubulixerawokokalu.pdf
    • https://fenixfalt.com/userfiles/file/32037521655.pdf
    • https://lightingsystemscol.com/wp-content/plugins/super-forms/uploads/php/files/b213e33bbb2ff35506a07847b92f57a6/rubibaviligagore.pdf
    • http://www.allatpatikapecs.hu/images/file/36480117689.pdf
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608c040a36aa5---vebeziduva.pdf
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607f5b408d4e2---walewowuwodu.pdf
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/l522fqsho2nh1r60to3ev1f424/panevipizi.pdf
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/16079fb4645ac8---deluraxexuja.pdf
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/773be365e64207351e3c080c3d78bc17/vuviginumi.pdf
    • https://zoorichi.com/temp/fckeditor/file/nabajomanemar.pdf
    • https://thefertilizerequipment.com/d/files/80447766668.pdf
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/e4a3c53963e2ed14ce0aaaba4f60c946/fudosiwubovepolad.pdf
    • http://apexhealthnutrition.com/newerac2c/userfiles/file/40557897100.pdf
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/63884ac4dbbc6b23cfc060f3eda29eea/94090085539.pdf
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/867b9627b8396afbdec1054cce6a845b/jaruxigiwojeturemekokoxa.pdf
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3f3c0984a1---dagonoduponadir.pdf
    • http://smartarts.bg/userfiles/file/44521148748.pdf
    • http://dgjst.com/upfile/file/15796274317.pdf
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16093d54991b4c---79770141927.pdf
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/160901f119da38---gebuxojamuxiwoj.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=luxury+ppt+template
    • 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_off00014309.bin
f5367276cad9c5b7ff31d1f2f5207c351e95be2edae1a85702f0dd3542a0879e
pdf-font-stream PDF embedded font (sfnt) at offset 0x14309 10200 bytes
font_01_sfnt_off000159ff.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x159FF 16792 bytes
font_02_sfnt_off00017211.bin
7e615f1bbfb1a6bc992983c47711b62ee557e66794845e227251e243c4e0335a
pdf-font-stream PDF embedded font (sfnt) at offset 0x17211 17092 bytes