Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9ce6ca54aeab21a…

MALICIOUS

PDF

128.3 KB Created: 2021-06-26 12:47:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cccabb918db8e6b849faf2e589d0bff7 SHA-1: 9751c1bf5f3c2b316b2997c3fe5a19a87ff85aad SHA-256: c9ce6ca54aeab21a937f5a3e1fd9d9fa5382dac3b2b038490f7998e07a80c5cd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a common PDF-based lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://archism.ru/uplcv?utm_term=the+law+of+delict+in+south+africa
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095af7b19894---zebotugudubodidiniseve.pdf
    • http://www.sport-konyv.hu/userfiles/file/jesapoj.pdf
    • http://danieldesignpro.com/userfiles/xewobafene.pdf
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/295627bbc4f40e6eb06b37e6c9da115b/gapotejaramifuwibi.pdf
    • https://www.erenang.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081702a083e1---86968933562.pdf
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/adf7cad83de8257dc69383bebe4b23f2/7066783498.pdf
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/0e45ed9ce7c213d017516de9ffed4b7b/gitemolakutojixiliseg.pdf
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/vkjk4e8p17h4mtuk3h981ps3re/66923076945.pdf
    • https://rajakedua.com/contents//files/65725733287.pdf
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160960e282ff71---lulezejojivamalebuzef.pdf
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/62675a70d1ceb4ea9690efb110951cbc/biwawodiv.pdf
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/ab86fa5604749245307d3b3725124085/fudinasekasufivexeb.pdf
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/gvl1jadh3hikuq1rvr0825ql32/68731036609.pdf
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160722c812a5ca---masuduk.pdf
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/bdjin9krfhqoms2elntaiivmse/68216469573.pdf
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/f9d8b259ed8761c69a68e350b98eaa84/subulamuzakike.pdf
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/kbski31i8ma9k7jigtp9452l95/fasofirasipa.pdf
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/aih3ugkotjfvn3jpvlgc8gin43/50947897386.pdf
    • https://sjalikave.hu/pictures/file/zetutalenobag.pdf
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160983edb7aca7---87156338552.pdf
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/ad9d53603c486f0b06b928a03ea9f7de/25717387768.pdf
    • http://szkolka-wiercioch.pl/files/file/82846901593.pdf
    • http://gibson100.com/clients/870224/File/vudexagakupilob.pdf
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/16076fe3e91767---84206105221.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_off000194b5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x194B5 16792 bytes
font_01_sfnt_off0001accc.bin
f59dd60faf2b263958379814c40b1966064c4a6b12edf75e7323f69ffc5865e6
pdf-font-stream PDF embedded font (sfnt) at offset 0x1ACCC 10724 bytes
font_02_sfnt_off0001c56e.bin
5ce9dd5f1cf67a091b9c5514355620d4190c94b20557c0bb7fca13ff1cb30838
pdf-font-stream PDF embedded font (sfnt) at offset 0x1C56E 17928 bytes