Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ef1d6761a95e1d2…

MALICIOUS

PDF

86.3 KB Created: 2021-07-07 23:43:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e71b2b508f29137160d3b11a8aaccd70 SHA-1: 773e19cb290ea39ab3cfb1e100aeaab6908abce3 SHA-256: 6ef1d6761a95e1d243d7a2c603c5a51d57148ac81451a3eb5811ea79e2ae2e1c
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to websites that appear to be part of a link farm, with several hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to direct users to phishing or malware distribution sites. No scripts were extracted, and the document body was unreadable, but the heuristic firings and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://bilmatbasim.com/userfiles/file/venupomamanukipakuda.pdf
    • http://www.herbertvanderbrugghen.nl/draft/wadusitixalegaw.pdf
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/8b72638e25f739e0bc3b63738d69761b/tevana.pdf
    • https://butchercurnow.com/img/shop//contents/68818315646.pdf
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/1606e968937102---nixebe.pdf
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae0683012f1---donizikewa.pdf
    • https://solidpractise.com/files/userfiles/file/99485890829.pdf
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca72c0910f---zavapezevonejitawesibe.pdf
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d7c5879042---70952242314.pdf
    • http://smeclassof1987reunion.com/clients/37165/File/tapakunimubukepe.pdf
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607207c80c05a---39553767680.pdf
    • http://jejuecotech.com/ckupload/files/sagalewovej.pdf
    • http://pr-jam.com/ckfinder/userfiles/files/72495041641.pdf
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/7a57cc705491535c339bdfdc68e48156/78856415349.pdf
    • http://mp-hd.de/data/aktualnosci_imgs/file/31139805672.pdf
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/7e705be4d8d598742153a20daf2c1571/37961350495.pdf
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/fec24cdde45d5b616e587b60576f6449/86225414661.pdf
    • http://hasyo.net/files/file/visefidivanulufex.pdf
    • http://ronniejoymemorialfund.com/clients/1/1a/1a75100f29d804137a154ca93ef51a80/File/16878980353.pdf
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/3ed19430d3535016e5fc20eb6109cb7b/88861683414.pdf
    • http://spy-military-labs.com/userfiles/file/68497627790.pdf
    • http://travelport.pl/userfiles//file/57509214228.pdf
    • http://kirilmazbardak.com/userfiles/file/razat.pdf
    • http://beachfirebrands.com/userfiles/file/22346902899.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=a+french+martini
    • 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_off0000ee41.bin
a8c67ece159f24333dfb426b0c0bfc67b23da63bc4d2331a005120bc6011e490
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE41 17588 bytes
font_01_sfnt_off00011bdf.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11BDF 16792 bytes
font_02_sfnt_off000133f6.bin
a929ce6c430b5d13aaf5ae596a9433636eb07cb14ed671478b905a5de5e5a365
pdf-font-stream PDF embedded font (sfnt) at offset 0x133F6 10248 bytes