Malicious PDF — malware analysis report

Static analysis result for SHA-256 7784de15af0d3480…

MALICIOUS

PDF

84.3 KB Created: 2021-07-04 03:52:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e20a8f4558c3974e209a5dc8a58c1343 SHA-1: 1c87c44262ef4af27b351acb73402ac7d5dd0b06 SHA-256: 7784de15af0d34804653336f247a97ac6d7382b1c84d3feff26e6d993edc9149
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which point to compromised websites or disposable hosting, indicating a link farm designed to lead users to malicious content. The ClamAV detection and ML classifier strongly suggest this PDF is malicious, likely serving as a lure for phishing or malware delivery. No scripts were extracted, but the structure and URLs are indicative of a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://garglob.ru/uplcv?utm_term=type+630+stainless+steel
    • https://www.idahomedia.com/wp-content/plugins/super-forms/uploads/php/files/8565e3335c95793b5dd8e50b15c6fc7d/fusezuxetafekal.pdf
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/9752bdea2f904e9fbd83a40679a5a1b8/94872539720.pdf
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607040557f416---11701329973.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160c5038ae546f---96148395615.pdf
    • http://turnyras.lt/Files/file/doferep.pdf
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/16089a5f9aac45---57187953783.pdf
    • http://firanywiktoria.pl/uploads/editor/file/rulowawujigebavok.pdf
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608064737aa1b---85571018800.pdf
    • http://coffee33.ru/archive/file/ponivubi.pdf
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/r5ekq6pjpnmcdqeb5pbtou0pa1/mexofug.pdf
    • http://nutronicltd.com/userfiles/file/66415319524.pdf
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160829a3479d8e---wajasawatolezuwewu.pdf
    • https://micro-churches.net/uploads/file/98931761090.pdf
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2d48b764b---38563388053.pdf
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16071a0b547bd7---jaxefilulifeku.pdf
    • http://kondicionery-vidnoe.ru/upload_picture/file/zosatu.pdf
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/3a98a6ca68faa029ec414911fb2265ca/18317218141.pdf
    • http://xn--12cbg9dihj7egda2g6a7dceb1d2cp4nvgf4f.com/datas/files/jizagokudif.pdf
    • http://www.look4job.gr/images/_user_na/file/75505745277.pdf
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/1ae148acc06d6c5c8a8aa38e98921cd9/19962575176.pdf
    • http://bagiez.com/userfiles/file/fixitevote.pdf
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/e56dafd40544b83387db718b8829b1f5/vivafimuluwowit.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_off0000e8f6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F6 16792 bytes
font_01_sfnt_off0001010d.bin
bf8e7cdb68a79137c98c19f52b99c7033f8de5dc12467793396437dfed48233c
pdf-font-stream PDF embedded font (sfnt) at offset 0x1010D 10564 bytes
font_02_sfnt_off00011957.bin
f7c9c530ab4dc020b98a24bc7c05224859d02a873d3c0ba63f6262127083285d
pdf-font-stream PDF embedded font (sfnt) at offset 0x11957 16632 bytes