Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a859f3badcecedb…

MALICIOUS

PDF

144.1 KB Created: 2021-06-25 12:49:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2a56f69266a997bbb411cbd2f5f5dae4 SHA-1: b400c53d910fffa722f344e0a6f1f47785432ea4 SHA-256: 7a859f3badcecedb677eeae5d6a30f52f4f44b9b21acba318661684096539c43
164 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to compromised WordPress sites, suggesting it's part of a link farm designed to host malicious files. The presence of a 'download button' heuristic further supports the lure-based attack pattern. The embedded URLs likely lead to the download of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://inwebjor.ru/uplcv?utm_term=configure+eigrp+packet+tracer
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff5fa51f48---17616915631.pdf
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/43bdb687ffedd7d4a5c9594856a02cf5/13880328367.pdf
    • http://deccanquest.com/konadnew/userfiles/file/saxugarugada.pdf
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/fmkjtcnfkur0rgg2coqn37hskp/lefuwutokozuvod.pdf
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1609b7b6da29a2---49758880487.pdf
    • http://raiders71.com/clients/4/41/4134020f2f298c111575624a380fabfc/File/jirimetokow.pdf
    • http://adaviestransportltd.com/userfiles/file/newineruxevewe.pdf
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/160912c8f6738f---jozegidonitelenobenojuvar.pdf
    • http://tsg-edinstvo.ru/userfiles/file/9348330657.pdf
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085665a94dff---batelemafike.pdf
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/65753942067.pdf
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/11abb1e9c80c46b1fef27eab05700d03/damevenonix.pdf
    • http://ashioke.com/images/library/File/mafipalamalubiluguzatano.pdf
    • http://ldbell1965.net/clients/85689/File/kegagoz.pdf
    • http://thamdinhgiadaiquang.com/img/files/zebuzebolot.pdf
    • http://akvari-um.ru/userfiles/file/32275332849.pdf
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/1e2642ca3e2aa03bca92ab6a3447b6e2/puxabolojakugimamuxil.pdf
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/9tjli3mkh86kvd09e1eln6vkio/6178600924.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_off0001d42d.bin
fda6fc0c9a8f25ba9f1aa28028b00faea22453dca5b7c8596cb629bc65dcb6b5
pdf-font-stream PDF embedded font (sfnt) at offset 0x1D42D 10664 bytes
font_01_sfnt_off0001ecd0.bin
7587b4705ebef6433c63aefd50fa0741876788669ec0422caef101f729842ad2
pdf-font-stream PDF embedded font (sfnt) at offset 0x1ECD0 17640 bytes
font_02_sfnt_off00021b2f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x21B2F 16792 bytes