Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bb4b658e5f38551…

MALICIOUS

PDF

71.8 KB Created: 2021-05-09 03:02:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 61f8319492b21e5a453734572c3b1d98 SHA-1: 2f048fbfa5f83f258bd1171799c048d92b5a55e5 SHA-256: 6bb4b658e5f385517fc805fb0d694c78373bde13c88bcea2b78c10d7dbddd5b6
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many of which are hosted on compromised WordPress installations, suggesting a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, contains keywords related to wallpapers and mobile devices, indicating a lure to entice users to click on the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://krisoc.ru/uplcv?utm_term=hd+wallpapers++for+jio+mobile+1080p
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/afbdbacded5a3d36cd768efe898d108a/venupeguw.pdf
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/f20ee5e59bb6b324e047e15cdf7b2b2e/domufebi.pdf
    • https://jnfarley.com/wp-content/plugins/super-forms/uploads/php/files/kugt6ui1vcdbmi3eot07sk24a7/10637219881.pdf
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/6puuqg58fno1mf1meik78adr4t/36543918539.pdf
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/hrlq9fou0hnvvrsve956dh8paj/23983603596.pdf
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075ceb6f07b9---podefodavudovapizegiwe.pdf
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/0adc58da27d5c474a4f83165df698ece/sonidoxote.pdf
    • https://myupfield.link/wp-content/plugins/super-forms/uploads/php/files/mad9kel6tvnudb2mbh9plh7124/finagewakimevituk.pdf
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16080ba3ed3e56---95867779022.pdf
    • http://aimic.com/userfiles/file/rinujogelotivurina.pdf
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/abedf7f5d0ecb0b33492c4ecac170919/kozupedovuga.pdf
    • https://actor-conseil.com/files/file/tofedifuwodolimevo.pdf
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/7c7f934a928fa3e9dd0472b475efc2e8/82167407424.pdf
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a9aa86ff4f---70848210548.pdf
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b0d682f660---wuvapotesetubunusuripij.pdf
    • https://accuratesearch.com/userfiles/file/40147808093.pdf
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16088d4c72e286---fenobefof.pdf
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/u13eitbli44qs5ilgt4em547gn/wosesijugizef.pdf
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/aaakevndti1n2vo7j5ebjo0k64/tisumoku.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da81.bin
fbc568df2667bb9b3b03503a2a4a01a0b23d3b0fce445a0156e467426c51d326
pdf-font-stream PDF embedded font (sfnt) at offset 0xDA81 5844 bytes
font_01_sfnt_off0000ee5f.bin
414d8d73b68ca8d2bd78ca5a2a3c8c88c79afdfe546d33d7cc4d0375024528ad
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE5F 10632 bytes