Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ac5b09d98552640…

MALICIOUS

PDF

82.7 KB Created: 2021-09-09 15:28:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 924231df5934b212e0e085d6ffb4fbb2 SHA-1: d68eea4b4827e51eeb83dc52a1201a9f199da001 SHA-256: 8ac5b09d98552640462e6e942147d0b7a11388a12a1ae88717633ec4dede3467
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URI heuristics and a link farm pattern strongly indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://inwebjor.ru/uplcv?utm_term=usb+debugging+android+auto PDF link annotation
    • http://niezapominajkowo.eu/userfiles/file/finolalazinajik.pdfIn PDF document text
    • https://wanna-drive.nl/files/File/59479560673.pdfIn PDF document text
    • http://lnianemarzenie.pl/userfiles/file/30049577293.pdfIn PDF document text
    • http://sungwoneng.com/upfile_editor/2021/files/dajewedagi.pdfIn PDF document text
    • http://sujitonweb.com/userfiles/files/xajik.pdfIn PDF document text
    • http://helder-effect.nl/userfiles/file/35301075599.pdfIn PDF document text
    • http://hidrometa.com/images_upload/files/31083381282.pdfIn PDF document text
    • http://www.ximangsongthao.com/app/webroot/uploads/files/bebirazuwagemexapol.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16138a307d7d1c---wuxojakesubumobasozula.pdfIn PDF document text
    • http://amindoost.ir/images/upload/files/sifalawafitawadaf.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16133631db1232---nefar.pdfIn PDF document text
    • https://kaptenhoki.net/contents/files/17903180829.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139a912117d4---10809370503.pdfIn PDF document text
    • http://onmamtour.com/FileData/ckfinder/files/20210903_42A86CEC78431AA6.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/77e29ec45be5779e0d32b075c6dd1345/42206042996.pdfIn PDF document text
    • http://hizirferforje.com/admin/fckeditor/editor/images/file/lepokawono.pdfIn PDF document text
    • http://iphysiology.ru/upload/fevufavunav.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/185cde84a17c165892cdcfd190d76abb/rurovuwidizema.pdfIn PDF document text
    • https://espiber.cl/images/uploadedimages/file/35213717355.pdfIn PDF document text
    • https://autopits-directo.migrupoq.com/ckfinder/userfiles/files/kamerudovinofiniwu.pdfIn PDF document text
    • http://unternehmensberatung-hegenbarth.de/userfiles/file/77185836074.pdfIn PDF document text
    • http://cappellastudio.it/userfiles/files/32075226735.pdfIn PDF document text
    • https://www.esicm-old.org/admin/lib/ckfinder/userfiles/files/20603291438.pdfIn PDF document text
    • http://czernavendeghaz.hu/admin1/file/17445366163.pdfIn PDF document text
    • https://betalinktech.com/blmedia/file/64943025910.pdfIn PDF document text
    • https://noursportevents.com/wheelmarine/userfiles/file/40706134805.pdfIn PDF document text
    • http://hanleyresources.com/images/denebatoju.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_off0000e0aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0AA 10624 bytes
SHA-256: cd131c5b1de9e9fa855047486f07087d36955bab283238849aad3edf14d6bb49
font_01_sfnt_off0000f8dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8DC 16960 bytes
SHA-256: 1a2e7e1171ae81beb755de498d6023eab4c3d08419e5277374685a3490df5fd4
font_02_sfnt_off000124fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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