Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4ad32df0ef9a47b…

MALICIOUS

PDF

90.2 KB Created: 2021-06-28 04:36:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7201cd99edd3c4b0b8579814686cbb5e SHA-1: abb33c8698ac56d57eb42461e885464404872369 SHA-256: a4ad32df0ef9a47bbe5dfebba5fb68f59c52a4de3bf8ba67705c717e46e96101
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, indicating it functions as a link farm to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL analysis point to a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/1sm6i22802gu0oklr062tek0k3/95736546670.pdf
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16086a0bf5b456---87771693330.pdf
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608a2969a4b22---99809628659.pdf
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/a81b72e2bdf3e67d901543e3642e6a28/remoj.pdf
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/3qa8ad9qmgvk3fdeqeo1f7p8ih/61242049364.pdf
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb11a61669---7927085857.pdf
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a47e2238b86---fadegerumekafa.pdf
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/c696fb1bcd4e47e891fb41e7d46c19a2/26481037875.pdf
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/vscui0a5pnofc7b6jgfc6oie41/51747674164.pdf
    • http://accessiblevehicleservices.com/userfiles/file/mejotiwali.pdf
    • https://local-atlas.ru/userfiles/files/tazow.pdf
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8aad197f5e---97453419533.pdf
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/1fbf4ee19a5f9dc3710cad07c5eb506e/lumidurituzufonepumeza.pdf
    • https://hitourkorea.com/FileData/ckfinder/files/20210612_AC2495127B2596EE.pdf
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c92eda4673c---jonudazanuxebapewogeka.pdf
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608554a128ac5---86005987566.pdf
    • http://amexeuro.com/an3_Uploads/file/jometosajavuti.pdf
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/7nfbaprgcc0hqag2gfglscugu0/gipanozuxitaveponep.pdf
    • http://antifftech.com/uploadfile/file///2021051503313895.pdf
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/dafn9n8kisntjkf1kvgnv0s2u0/8626398254.pdf
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160c75bdd7970c---lizufakuvasadisibojek.pdf
    • http://alibabashipping.com/userfiles/file/43896486235.pdf
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/52e67578fe0e925838ef8b6a246b3db5/revoj.pdf
    • http://eshop-kocicinadeje.cz/files/file/44606693789.pdf
    • http://associatedreclaimed.com/userfiles/files/bimojixosigavisiguvu.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=with+all+my+love+meaning
    • 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_off00010019.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10019 16792 bytes
font_01_sfnt_off0001182b.bin
b8d671d74c15a296d45184e31bf6fb64652fdfb1c4544de06630d996c271f152
pdf-font-stream PDF embedded font (sfnt) at offset 0x1182B 17156 bytes
font_02_sfnt_off000143f9.bin
b85369cfd1bddd6826187215c4cdf83958ce484d0d4251da4af5acd7e30ecb43
pdf-font-stream PDF embedded font (sfnt) at offset 0x143F9 10460 bytes