Malicious PDF — malware analysis report

Static analysis result for SHA-256 41afc54d47ca11a8…

MALICIOUS

PDF

88.3 KB Created: 2021-06-30 00:06:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c64b364a55be4e3c316d83e52d54399a SHA-1: 41880b466c6b0e02113a279084fc015beded70de SHA-256: 41afc54d47ca11a837629a745520d95a913c734b060cfd928c8ad3568d553d3c
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating it likely contains malicious content. It functions as a link farm, with numerous embedded URLs pointing to potentially compromised websites, suggesting an attempt to lure users to malicious content or phishing sites. The presence of multiple links on disposable hosting and compromised CMS upload storage further supports a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a94772d5b86---38302738174.pdf
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073035de738c---14727883321.pdf
    • https://www.sacda.org/wp-content/plugins/super-forms/uploads/php/files/ci6rrc5u5ueb8p9h83loov6135/jijafupanifevotevilot.pdf
    • http://northcity.rs/slike/files/wotoxomi.pdf
    • http://hakkabrothers.com/userfiles/file///25604581654.pdf
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/984b8efaf675abf726138f768a0b7bff/64491873351.pdf
    • http://brianhaymore.com/images/e/file/kumipedatebilivamalutuwu.pdf
    • http://lordbeaverbrook1973.com/clients/76835/File/23882865680.pdf
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c29a3ce62e7---99266480921.pdf
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/fcpg1pf6lstrfd0hd3hqibics5/kudago.pdf
    • http://rosabaum.de/web/editor/files/kajuseb.pdf
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608bd5927ab73---35456124729.pdf
    • https://ises.ca/phpsites/vertical_living/uploads/file/begasixojowamif.pdf
    • http://limobebe.com/userfiles/files/14850621421.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd70c1dee21---nepuze.pdf
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607bff3d0aaa8---61710628012.pdf
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607f398b1575b---jigigimewu.pdf
    • http://kagoshimakojintaxi.com/userfiles/file/76066030870.pdf
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/a31f00e67d215489a38f3c278331be38/zobarem.pdf
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160bdd03498d0b---redal.pdf
    • https://weeb.nu/userfiles/file/nowaduloniwipuwagenaguber.pdf
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/bfd8d42f0ba66559d1069b4ee47a7cf5/fijaxibotozufatevupibawa.pdf
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b5ec0cb47d9---36661956698.pdf
    • https://liniagdanskzydowo.pl/files/21561846307.pdf
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076f53985add---xaxirufutugofesuneluwu.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=ragas+in+indian+classical+music+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_off0000f5ae.bin
247d877f6fb7a48dc8944403b638e62948ee9d64d669659337f54bc6b7212463
pdf-font-stream PDF embedded font (sfnt) at offset 0xF5AE 16992 bytes
font_01_sfnt_off000121de.bin
088ab6b01a9b71c89db6a2d78c4ee142ea087ab66b436431d00b72f36c4eb9e5
pdf-font-stream PDF embedded font (sfnt) at offset 0x121DE 10656 bytes
font_02_sfnt_off000139f8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x139F8 16792 bytes