Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a6ee3e986494282…

MALICIOUS

PDF

83.9 KB Created: 2021-08-26 09:44:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1a6d90681cd8c2cc7dc5388ffb0cf0cd SHA-1: 77b94cffca3467e9bfa02099ed97e1bc271e34cf SHA-256: 8a6ee3e986494282f719227c2ea5d5ca44214b91b7498e87578d22a19c3e96be
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to compromised websites, many of which are hosted on WordPress installations and utilize formcraft plugins for file uploads. This suggests the document is designed to lure users to malicious sites, potentially for phishing or to download further malware. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9925

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=sorting+sentences+into+paragraphs+worksheets PDF link annotation
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/160a0867477f66---matawijepolaxeduzewitori.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082f3ef88660---91549552432.pdfIn PDF document text
    • https://vietspices.asia/uploads/files/1563579443.pdfIn PDF document text
    • https://www.dartmusicfestival.co.uk/wp-content/plugins/super-forms/uploads/php/files/8923cab661c8de36bc2d17e307fd650f/33151121220.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/16124c436e15a1---gezaledurutodubi.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///8803179377.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f58ca08e69---boxenepitaw.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16077c21119f69---matipik.pdfIn PDF document text
    • http://grawerlik.pl/userfiles/file/gojewo.pdfIn PDF document text
    • https://tktravelkorea.com/FileData/ckfinder/files/20210729_8969E276F1CFBADE.pdfIn PDF document text
    • https://kingwrapcarspa.com/upload/files/25959048728.pdfIn PDF document text
    • https://distriparkbotlek.nl/userfiles/files/4666800784.pdfIn PDF document text
    • https://matfreklam.com/calisma2/files/uploads/352822004.pdfIn PDF document text
    • http://daphongthuyhueminh.com/uploads/image/files/waxetutogizamuxe.pdfIn PDF document text
    • http://tchid.net/userfiles/file/ribetibupiwizijujenizad.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6fa7e3313f---dikonu.pdfIn PDF document text
    • http://info56.ru/userfiles/file/37934595206.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/160886e6f46791---jogevoge.pdfIn PDF document text
    • http://jyotiacademicpress.org/uploads/file/17312778015.pdfIn PDF document text
    • http://mhs69indians.com/clients/864804/File/gotewunewodimogevodab.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a7159f20a2d---kegurepafetusoronar.pdfIn PDF document text
    • http://isagenixmakessense.com/ckfinder/userfiles/files/bikoninojusuloxemi.pdfIn PDF document text
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/5fde1fbd7d2500bc2eb70cb83b4133ad/98648205560.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16086bb747897b---turozixumumulepujebik.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd3505bdf3---7049923251.pdfIn PDF document text
    • http://hongdacable.com/d/files/pakujuva.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e4b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4B8 16356 bytes
SHA-256: 452ce8968c9c401c7f1f9faa214775d9372d33b0bde84e44ff1c89cb1a237010
font_01_sfnt_off00010f4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F4D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012764.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12764 10860 bytes
SHA-256: df5a57cff192816028c24dfcb743155c20faa48f1206dd933584428cced334d3