Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f3c7a3430170291…

MALICIOUS

PDF

72.5 KB Created: 2021-06-25 00:36:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 55e80d48f2a073f1596cbc42b5092202 SHA-1: 4be7c59963002ae92a4b32223b2ca213e841cd42 SHA-256: 3f3c7a3430170291b00d8168df5eba17a9995d9c1f65d4eb23386c54430d77fd
156 Risk Score

Malware Insights

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

This PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to numerous compromised websites and disposable hosting, suggesting an attempt to redirect users to malicious content. The document body, though heavily obfuscated, appears to be a lure related to file conversion, a common tactic for phishing or malware delivery.

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 http://arcomproltd.com/userfiles/file/goxezerepe.pdf In PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/61da8245853e115619e8f29f06ef7a2c/tegijetanemapodofuvexik.pdfIn PDF document text
    • http://hattingtoemrerogsnedker.dk/userfiles/file/69310159850.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/gikirodife.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/hqaooa72cam298l93ebcfncj6h/poluloginef.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/16087f6c6bb922---wufikaz.pdfIn PDF document text
    • http://novichiha.ru/pic/file/tivatadipo.pdfIn PDF document text
    • http://iaestedresden.de/userfiles/file/sesuvupevu.pdfIn PDF document text
    • https://clubelsendero.com/img_pag/file/14271102295.pdfIn PDF document text
    • http://dush-kz.ru/uploads/fck/file/dakadopexovugi.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/a228c16f502c6c2232dddcf2c5c6e082/demetedutimawo.pdfIn PDF document text
    • http://ottotech.center/userfiles/file/tizefiniwibufexena.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/59615142032.pdfIn PDF document text
    • https://bauarch.bg/files/ladipupi.pdfIn PDF document text
    • http://solamsys.com/userData/board/file/tajilepi.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/7d0e349c4f3858c028e8e611587f6493/43375095665.pdfIn PDF document text
    • http://teechart.com/uploads/images/files/18125181594.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/5ciellvu9s8jp41dboemd6p72g/30889746482.pdfIn PDF document text
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/7cc137f430a040abc2feb77b126dc255/64587953436.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=how+to+change+pdf+to+tiffPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ddf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDF1 5164 bytes
SHA-256: c1faa13c8273eccf2ad7896d207bfb306b286c7c5e614eb9f5fa8c331a15dc3f
font_01_sfnt_off0000ef9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF9F 10952 bytes
SHA-256: dd9f2e422cc64a0f1948693806a68b713dff7d7267c1188116eb5acf40e21bf5