Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1d848ff621f0945…

MALICIOUS

PDF

71.8 KB Created: 2021-09-04 16:50:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1df5bc6df02987b6e8e36ed5dcb540ce SHA-1: 89616dd867b86773c7e8b7d94dbdf7b706542423 SHA-256: f1d848ff621f0945e126d8c89be20d8d2e767640f0a126174c7c866c974634ad
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external resources, many hosted on compromised websites or part of link farms, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or delivering a trojan payload. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://bahtiyardishekimi.com/fckfiles/file/tuzegokonovidowiwulemiv.pdf
    • http://i-p-p-c.com/ckfinder/userfiles/files/xabuxifanomekuxakuwix.pdf
    • http://sea-cruise.ru/ckfinder/userfiles/files/sosokolewiwenejinuru.pdf
    • http://sieuthihatgiong.vn/webroot/img/files/73322058408.pdf
    • https://ecoverservice.be/gallery/file/24711423639.pdf
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073b61278d4f---xawepo.pdf
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608f4e1648ded---72313271768.pdf
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/89c007b4b0a2f1e4dcc3ef94697a3c47/garoxigewurinufok.pdf
    • http://ldkxzzs.com/images/userfiles/file/lonasopijodurofovunowufi.pdf
    • https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/2b33d13ecbc6921877ca360f365d0f3a/nupekatewulemitumeputoxu.pdf
    • http://hebakotb.net/userfiles/file/nudanobisus.pdf
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610b00170505b---25696798274.pdf
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609482b81a502---44899911116.pdf
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/dpqkdfkaikto10dceik7hko082/12579676781.pdf
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/9vtq5fntash0aqu6ubi9r17el3/wirepob.pdf
    • http://northmarking.com/userfiles/files/57244523824.pdf
    • https://detmers-kontejner.hr/files/30140651635.pdf
    • http://kiddeefire.com/media/userfiles/files/fonivesosu.pdf
    • http://uralcomservis.ru/crn_fls/crn_files/91619465971.pdf
    • http://dribblebar.pl/userfiles/file/nigujovojajiraxavidirip.pdf
    • http://www.retorika-zidar.si/ckfinder/ckeditor_uploaded_files/files/kapabijos.pdf
    • https://club-sports.net/uploads/products/files/32420749600.pdf
    • https://nmg.lv/img/uploads/files/jezuduruvunobowolodakum.pdf
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/7sllj5gtqsp8c5p30fj9mse1jr/40412505066.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=convert+word+to+pdf+in+word+2007
    • 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_off0000b92f.bin
9e5a9afacc4e84be2e5c92129595d566b5d7b0dd5292ba782dfa76a6994cb99c
pdf-font-stream PDF embedded font (sfnt) at offset 0xB92F 10588 bytes
font_01_sfnt_off0000d1a1.bin
9c32b21fdbcf5116f2d45cd92c5205ee6d9e992f340eb88b227772f8f56b68e6
pdf-font-stream PDF embedded font (sfnt) at offset 0xD1A1 15640 bytes
font_02_sfnt_off0000f975.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF975 16792 bytes