Malicious PDF — malware analysis report

Static analysis result for SHA-256 c807341ed7a8233a…

MALICIOUS

PDF

76.5 KB Created: 2021-09-23 03:44:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8c2f7c16894e8b4c3b9824034fdf862f SHA-1: 9436f587755af11a391f0678e804b1cf0fac8c06 SHA-256: c807341ed7a8233ab67f6788af0741dd3ff6229670e7c616a820a45fd70ce487
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The presence of a ClamAV detection for 'Pdf.Phishing.Trojan' and ML classifier flagging strongly suggests malicious intent, likely for phishing or distributing further malware. The document body is unreadable, but the heuristic firings and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://smidgel.ru/uplcv?utm_term=how+to+unlock+android+pattern+lock+if+forgotten
    • https://www.potravinyav21.cz/ckfinder/userfiles/files/50900000432.pdf
    • http://emanuelmlevin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/5346898185.pdf
    • https://adikkeempat.com/contents/files/78543373206.pdf
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1613e05cb450c6---73857907497.pdf
    • http://lmnn.ru/userfiles/file/lipivatatovovarameke.pdf
    • http://yh-nutri.com/filespath/files/20210911082054.pdf
    • http://nexxosrealty.com/userfiles/files/92154817022.pdf
    • http://www.taylormadetc.com/siteadmin/ckfinder/userfiles/files/60481430717.pdf
    • http://bestpokeya.com/uploads/files/11896297733.pdf
    • http://111-orte.com/testarea/cwsCMSlight/media/files/wituvaxeranizo.pdf
    • http://savytrading.com/userfiles/file/muzisunu.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131ca0fbba0c---tarodawabuzanaduli.pdf
    • http://stitesattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/44754874015.pdf
    • http://nofatrans-int.com/userfiles/file/sowududamutokopi.pdf
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144a5ac5fafe---karazobotewuwevipawom.pdf
    • http://dansecyr.ca/pdf/file/kevixurilaxeketivat.pdf
    • https://chupwo.com/editor_upload/file/lujujibazake.pdf
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/16146332561a7d---22111130292.pdf
    • http://villahetzwartepaard.nl/survey/userfiles/files/wifutelato.pdf
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148477319a84---93931145578.pdf
    • https://markyatirim.com/resimler/files/wanugoninuguridog.pdf
    • http://styrexon.cz/userfiles/file/12516606186.pdf
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/3b9f6ab294579d74400645a6c3523c63/kekofaremiwujosomipufexa.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_off0000c509.bin
3fdb10d22b2091f387444429798aabb84a21b4adc70b23eaff1a19039d9fdfd4
pdf-font-stream PDF embedded font (sfnt) at offset 0xC509 10896 bytes
font_01_sfnt_off0000de32.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDE32 16792 bytes
font_02_sfnt_off0000f644.bin
9db9c775e2730f4e7fa938a7b361e1c53054bf41fcf91ad5aa6c6c943e4754c9
pdf-font-stream PDF embedded font (sfnt) at offset 0xF644 17908 bytes