Malicious PDF — malware analysis report

Static analysis result for SHA-256 33206dfdc6dc59c9…

MALICIOUS

PDF

81.1 KB Created: 2021-09-06 17:00:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4e083e0d64b05efcf430aaa98b019f95 SHA-1: 8f0cbf7bd6a141283a0f235255a99d1f66b68a20 SHA-256: 33206dfdc6dc59c9bb5af75a3d8db6f14693e3169472601a0a84d1f9425d337c
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan. Multiple heuristics indicate it functions as a link farm, directing users to various potentially compromised or disposable hosting sites. The presence of embedded URLs and the ML classifier's high confidence score suggest a malicious intent to redirect users to phishing or malware hosting sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://budohurtsa.pl/userfiles/file/bozofewo.pdf
    • https://radekslodkiewicz.pl/files/file/93006064822.pdf
    • https://pendekaremas.com/contents//files/48632296557.pdf
    • http://itps-group.com/uploadfiles/file/49060417484.pdf
    • http://157.230.241.115/image/upload/File/tijabegiparozef.pdf
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071bf9dc4236---nenukupalibubuxuxi.pdf
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/csnsv894sncgsje9krbcek3n2c/32485800482.pdf
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c85b3d19d5---55531960725.pdf
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160912942628f1---62031507849.pdf
    • https://dineflon.com//files/japaf.pdf
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/6c928ed164633fffcd071e0ff94d8521/54318805717.pdf
    • http://lakes77.com/clients/47041/File/sotukufodefimimenuna.pdf
    • http://allnatureint.com/userfiles/file/15913143875.pdf
    • https://toppelletmachine.com/d/files/2888927717.pdf
    • http://zabradli-znerezu.cz/userfiles/file/wisuvupos.pdf
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d280b3ecfb---88667450007.pdf
    • http://boki.hu/editor_up/90050524381.pdf
    • https://toscanafantastica.com/userfiles/file/tezoxixadivajil.pdf
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/3c954dc3ab484a1de611ff97dbdcc851/pafatekimax.pdf
    • http://jjburgerut.com/uploads/files/59905857734.pdf
    • http://krevue.cz/UserFiles/File/faxabegozozalubafematokop.pdf
    • https://plagij.at/ckfinder/userfiles/files/lusibifajoruzumis.pdf
    • http://coinproject.com/userfiles/image/file/dizevuriretizonoti.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=reussir+le+delf+niveau+b2+pdf
    • 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_off0000cd3d.bin
9c6d6261b462362c5e841f0a4525f4449f49c9499dc1857f88b5ee61fbb55891
pdf-font-stream PDF embedded font (sfnt) at offset 0xCD3D 21720 bytes
font_01_sfnt_off000104d4.bin
777b0923f75b38712b13e1467fd9b1b7372eeaa6a8aaa99685601956eeb8772e
pdf-font-stream PDF embedded font (sfnt) at offset 0x104D4 10744 bytes
font_02_sfnt_off00011d74.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11D74 16792 bytes