Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6ca1bbd42f341ce…

MALICIOUS

PDF

85.6 KB Created: 2021-08-09 22:44:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a4723055189320415b4b46a77557b512 SHA-1: 4cb696425a1c9520925580ec8d8b7d2e9187bb17 SHA-256: b6ca1bbd42f341ce06c0037eacae671a3797d25b0b847acd61fb8a3b9ddfd3d1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. The PDF structure and embedded URLs are consistent with phishing or malware distribution tactics.

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://ketchas.ru/uplcv?utm_term=history+of+africa+kevin+shillington+online+pdf PDF link annotation
    • https://svingenieria.cl/userfiles/file/74847901764.pdfIn PDF document text
    • https://zulapin.com/calisma2/files/uploads/xivifojizafolesiga.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/160c07f7e0752a---65212188799.pdfIn PDF document text
    • http://netinflux.net/userfiles/file/47744806083.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090f4fb5f38c---35079850843.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/ba07e66fddd0c7bddcdc80c8b5427f40/magegazulinukukeras.pdfIn PDF document text
    • https://muguet.fr/sites/default/files/file/69458058143.pdfIn PDF document text
    • https://datajournonepal.org/files/82513544861.pdfIn PDF document text
    • http://rebornfair.com/FileData/ckfinder/files/20210701_50BCAAC3CEA91AAC.pdfIn PDF document text
    • https://bulgariapools.com/contents//files/rulibipeta.pdfIn PDF document text
    • https://aravlicraft.com/cmsCart//upload/file/2725323264.pdfIn PDF document text
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/5m887ft75h1j6637i6fndbqll9/terasiledaluduwidofawe.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/50fc07489a946609b120cbefdc403149/kexetu.pdfIn PDF document text
    • http://brookhavenclassof1967.com/clients/0/0c/0ca802fc87877f8c548ddf85495caeb2/File/pasuzomutonir.pdfIn PDF document text
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/47cebb6f164e18d9fc5aa4b19adf43c6/10825283805.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/95435280947.pdfIn PDF document text
    • https://actor-conseil.com/files/file/rojirikewokivipo.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ddaa2652bd7---11420856670.pdfIn PDF document text
    • http://ms-beauty.com/ckfinder/userfiles/files/sasajazubaxidapaxelefuxe.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/3eb60e41d2c711812b6d8a03accbda69/2633367183.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160984e19728be---wixudilalefufededotatuzob.pdfIn PDF document text
    • http://remont-elektro.eu/archiv/file/70619302261.pdfIn PDF document text
    • http://telekommarketing.com/firme_data/files/fipumakibuzojovukivur.pdfIn PDF document text
    • https://residenciasanamaro.es/userfiles/files/82035743195.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/b413d2db57aa4221d5fb4a57eeef161d/famajuroleminigeli.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/skc1asn1mc2j2fg8roi0efrc3u/gujamerelipuzababoz.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_off0000e723.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE723 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ff35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF35 18604 bytes
SHA-256: 7ef442f4e8fd015342b17326a2d7b2d5ba473dc9966f8dacff12317043ba8f1e
font_02_sfnt_off00012e02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E02 11160 bytes
SHA-256: 47eff70c984490823edf6694d3c824599b50437bec48c003a47928fdfe49c30b

Open this report in the interactive analyzer, or submit your own file for analysis.