Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab9fc2ff4a7c0d69…

MALICIOUS

PDF

74.7 KB Created: 2021-06-28 02:51:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a49eee5f4d10c20f62769410932924f5 SHA-1: 7f40df5c269526601a1784f2b2a1af08754b7166 SHA-256: ab9fc2ff4a7c0d69cc1af3cb2f5a544bd8b0f1c74576bdfc72a55450b8b692f9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, identified by heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160952c4e9a477---23491934601.pdf
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/ad3f7ebdb5bdd77d707a716e98814fef/31062917598.pdf
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/1f5bb3a69fa75af15781e58cc903a72b/18817542694.pdf
    • https://samarpanbharat.org/trila/userfiles/file/wabelekaxuza.pdf
    • http://hersheyhigh1981.com/clients/37302/File/97898835873.pdf
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607863cd99e6e---domowex.pdf
    • http://traiteur-ribot.fr/userfiles/file/gidurepolepawuke.pdf
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/uk3rflfb12654mdialh9073dft/9310853823.pdf
    • http://absolutelyneon.com/userfiles/file/wurokopumibagove.pdf
    • http://daedukgs.com/admin/fckeditor/data/file/20210618212126.pdf
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160b88c7ca8ac0---wuvinemurewipevi.pdf
    • https://agrimal.pl/userfiles/file/85974313048.pdf
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071993b08913---mavipam.pdf
    • http://papianiarch.it/userfiles/files/86003690795.pdf
    • http://drironcat.com/images/file/58474040865.pdf
    • http://93564497.com/userfiles/folagotupadinipale.pdf
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/6c53917f6047fa86299984a826e5770c/woxagu.pdf
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/j49sn1uf8r0tv396incq8af9vr/73395738934.pdf
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/e737f4c227139b9261ddcc3d5d498c5a/30444540179.pdf
    • http://biomassasia.net/data_ed/userfiles/file/manivamivojaguvuzusaz.pdf
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a3dde6332b2---zumefaguribep.pdf
    • http://tz5168.com/uploadfile/image/2021/05/22/file/20210522_220925_109.pdf
    • http://esoftland.com/userfiles/file/ronexeme.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=roll+of+thunder+hear+my+cry+answers
    • 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_off0000c335.bin
de15d0e094ca991aac7fc804eab1184e6ed66bdc751d08e324e7544735e7a4e5
pdf-font-stream PDF embedded font (sfnt) at offset 0xC335 15928 bytes
font_01_sfnt_off0000ec03.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC03 16792 bytes
font_02_sfnt_off0001041a.bin
55ef3e5077f5637c087a9f8052202649454588855e890c2874abba60487f7eb5
pdf-font-stream PDF embedded font (sfnt) at offset 0x1041A 10992 bytes