Malicious PDF — malware analysis report

Static analysis result for SHA-256 69a6a28f4563e19c…

MALICIOUS

PDF

88.0 KB Created: 2021-07-20 18:43:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6c4edb235431904ecbedbb83f20901e1 SHA-1: 66190e6bb86ce452ecf2b1e4b67b9c731722cc48 SHA-256: 69a6a28f4563e19ca893b469444537c0d9269445a039c037111276f926180388
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised CMS upload directories, suggesting a phishing or redirection campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites or download further malware. No scripts were extracted, but the link farm structure is a common tactic for distributing malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://nbcmedia.vn/ckfinder/userfiles/files/mugomazidi.pdf
    • https://al-farh-iq.com/upload/userfiles/file/pefab.pdf
    • http://teusz.pl/UserFiles/file/ruvawozeragibijoxevam.pdf
    • https://argumentua.com/i/file/94896399495.pdf
    • https://flardochform.se/userfiles/file/51171414726.pdf
    • http://kxzyjy.com/CKEdit/upload/files/gozoxewerubavekerij.pdf
    • http://ibshop.gr/uploads/_uploads/files/66556077521.pdf
    • https://pointsourcegroup.com/wp-content/plugins/super-forms/uploads/php/files/3a46d6a89c981ecb610930dff38d04b9/tavanav.pdf
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/77455369d2fc90bd4d6c57826f16ffac/kujozisim.pdf
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16073ca8622bb9---16005547791.pdf
    • https://daleel.global/wp-content/plugins/super-forms/uploads/php/files/5k5qrudpimtt2vheqs4go4ng68/57821414356.pdf
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/476500ede574a665b77d861509b2e89a/99855540772.pdf
    • https://batikatravels.com/userfiles/file/40130959177.pdf
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/464e4fa895c4918828f1ba3533aadf6c/gizerefinokubamabodaw.pdf
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a072636f48d---17238562261.pdf
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7795ee0146---manividajuriza.pdf
    • https://nutritie-metabolism-sanatate.ro/app/webroot/files/userfiles/files/81613667445.pdf
    • http://firanywiktoria.pl/uploads/editor/file/zujukumo.pdf
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/947ac471b0862c7f50eb5fdab6a96124/kosorugu.pdf
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/h5db3coe6ct2sf615jlt7t9gbs/46152817212.pdf
    • http://fincasotilloviejo.es/files/sotillo/_repo/file/98671608977.pdf
    • http://wearefamilypalestine.com/clients/3/3b/3bc38fc23f9ffb54b20226cbd6ad6ce3/File/22456018855.pdf
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/136ecbec573b49fe0e8ae4d4f596dd09/kosidexeresuvirogo.pdf
    • https://indobaliart.com/sitefiles/file/14428165922.pdf
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/2198d792e25585ba1b62e76362f97ca9/natejubemuxo.pdf
    • https://www.makathastaliklari.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607c1ea26e6cc---ronagapibudodedewun.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=how+to+save+edited+video+in+imovie
    • 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_off0000f537.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF537 16792 bytes
font_01_sfnt_off00010d4e.bin
2308b1fb494e1e5076a627091b951d8f9511fedcc4bb451c604da05c26875e53
pdf-font-stream PDF embedded font (sfnt) at offset 0x10D4E 10408 bytes
font_02_sfnt_off000124dc.bin
20393410b413e9aa2cd7b430e145f612b720c60b01faab916274c38351d45ba3
pdf-font-stream PDF embedded font (sfnt) at offset 0x124DC 17820 bytes