Malicious PDF — malware analysis report

Static analysis result for SHA-256 afec08604c659150…

MALICIOUS

PDF

92.6 KB Created: 2021-09-04 10:00:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7e31a9196aa43c267748aaedaaddfa4c SHA-1: c40559a443ab0c4df930ea5734a79ebbbb1944e8 SHA-256: afec08604c659150d84a8e65f58c3152d7bd572184699028e84b3ed243eda087
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous links, many pointing to potentially compromised CMS upload locations or disposable hosting, suggesting a phishing or scam lure. The presence of a 'download button' heuristic further supports the idea that the document is designed to trick the user into downloading a malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9726

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://accesoriosalmayor.com/images/userfiles/file/39957396856.pdf
    • https://prokoncept.hu/admin/blogfck/image/file/76777942321.pdf
    • http://slp70.com/clients/873855/File/tamumezajewopimofu.pdf
    • https://bak.vn/upload/files/bejidogatagemulumexutuzun.pdf
    • http://farmina.ru/uploads/files/fonufofepofinoduwadomo.pdf
    • http://lejonhund.com/upload/20331368750.pdf
    • http://dedanskecasinoer.dk/userfiles/file/83087204478.pdf
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073fbb971547---gubewole.pdf
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/pba9ql8k7jacu3gp9pqc7h17so/mulenakifonimafubod.pdf
    • http://maslag.eu/userfiles/file/deruxilig.pdf
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/6ed4d99656af1f2b4210dd9ad683cc47/306813710.pdf
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/ig689rm24grbtdmo7agtelpvv9/tofekaxexixamewovifuzabad.pdf
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/eafe37956c3770df76c17215c17f7314/1796450928.pdf
    • http://mobilenmr.com/files/files/nevufefatuku.pdf
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/160bc3e4be4796---nesuperurojuxedeku.pdf
    • https://doluhosting.com/calisma2/files/uploads/40158068388.pdf
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/64efa96a371f9908d0dff7e64393a01c/92885115272.pdf
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6992209b36---zutawad.pdf
    • https://vendax.ro/files/file/gofeboniwewej.pdf
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a680e88a491---wifokatogufobe.pdf
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093e115b0ce1---wevozifu.pdf
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d4a9217e698---tediba.pdf
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160917ef60efd5---91832483986.pdf
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/16075856355ca5---74502601846.pdf
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dbbcd53f9da---luwagomoresalibipax.pdf
    • https://accu-split.com/userfiles/files/46656153064.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=qigong+practice+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f72d.bin
0bdfde5936c887d21594ac3fbfb48341d82e3aea7d94805c2ac4ea5be3c0e815
pdf-font-stream PDF embedded font (sfnt) at offset 0xF72D 10640 bytes
font_01_sfnt_off00010f81.bin
7a94accc6b4ca69ec24e11173f2fc367bbcff19d17b5dcc3167e857629fb2493
pdf-font-stream PDF embedded font (sfnt) at offset 0x10F81 2284 bytes
font_02_sfnt_off000119a5.bin
567bd051194ee6d39ddc6eba9c968ca952419927fb1f11942d76015668e89aff
pdf-font-stream PDF embedded font (sfnt) at offset 0x119A5 19444 bytes
font_03_sfnt_off00014c3a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14C3A 16792 bytes