Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad3065ea78ba295f…

MALICIOUS

PDF

102.3 KB Created: 2021-08-17 05:36:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 98af5b4af56b433e1f1faead58a97303 SHA-1: 650e07103ef8c349894cd454a7080eb26a8e9d42 SHA-256: ad3065ea78ba295ff840b8785c994a477d20e2d860d7d7bc67dcbde03da6828c
156 Risk Score

Malware Insights

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

The PDF document exhibits characteristics of a phishing lure, primarily through its extensive use of external URLs. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a non-clustered link farm on disposable hosting, and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' points to compromised WordPress uploads, suggesting an attempt to obscure the true destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://wastran.ru/uplcv?utm_term=south+pole+adventurer+reading+answer+key PDF link annotation
    • https://postele-z-masivu.sk/ckfinder/userfiles/files/60243070751.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c462985aa8e---65385552459.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/xikesoxukaxabirizer.pdfIn PDF document text
    • http://trendybiz.in/usersfiles/file/50419374652.pdfIn PDF document text
    • https://tapetcenter.ro/app/webroot/files/userfiles/files/41905075272.pdfIn PDF document text
    • http://tmacfashion.com/ckfinder/userfiles/files/dugubuzolizedu.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608f5e5ad2037---gibepufosusoxuzufo.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-7-22/20210722225050730363.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/f697c043f5fdcfb850cad73590330f61/98165075267.pdfIn PDF document text
    • https://binarbaidrealestate.com/public_html/userfiles/file/masumedewepovodaranorepo.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/43tqlv0qq26vvafd0gg6ecr6dm/63996176728.pdfIn PDF document text
    • http://testplanet.nl/uploads/files/vuduketapo.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a37ca0b91b9---94810404760.pdfIn PDF document text
    • http://antwerp-reefer-tournament.be/argt/files/8473515665.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/85235910060ade4ec55365.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/155a6cfdaba1f6a9575bc1fe9d2fc33c/pefodabipugozezula.pdfIn PDF document text
    • http://jfhconsultancy.nl/userfiles/files/bewusazivizujugagapevet.pdfIn PDF document text
    • http://fernandopelosini.it/userfiles/files/rupawilixubibufav.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/patateniko.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074c05c823b1---24371689071.pdfIn PDF document text
    • https://sanagustin.cl/files/5969767424.pdfIn PDF document text
    • http://stin-verdon.fr/assets/Image//files/26621593950.pdfIn PDF document text
    • http://spalovnachemolak.sk/userfiles/file/58727740976.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/45857c34839aa81fd645157cd946d75d/gejelagutiji.pdfIn PDF document text
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001255b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1255B 11204 bytes
SHA-256: f833cce4e79fa1c76cd2de7623702d17133a2aad58272447daa9f508c7e90586
font_01_sfnt_off00013f62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F62 20220 bytes
SHA-256: 44074a679ed6753a11934cbb8617affd8180fe07d98f008f71f0a1805f99c3b9
font_02_sfnt_off0001731e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1731E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1