Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa6b173babaf8c26…

MALICIOUS

PDF

82.6 KB Created: 2021-09-12 10:16:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d11957e85fa0170c8cd09db781fd4fb8 SHA-1: 59fef6ce3a63db1ff9f75b5e0a80e800c5805c6a SHA-256: fa6b173babaf8c262decad46258852ea98042ebb78dc5dd70074d2bfe4d4f0c1
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a phishing or malware distribution campaign. The presence of external URIs and link farms indicates an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://majubesar.com/contents/files/50827078628.pdf In PDF document text
    • https://smartstone.ca/userfiles/files/gupedotabegemokusudi.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/d0903f9437152306b650a5a235fdeaf4/bunolufevelamakapor.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/882d20ea257681441c98b8976a111cd9/pibid.pdfIn PDF document text
    • https://tractorpulling-emmeloord.nl/upload/file/8482695258.pdfIn PDF document text
    • http://www.gobarging.com/uploads/textareas/file/63214178742.pdfIn PDF document text
    • http://yishiweb.com/upfiles/files/20210901_053012.pdfIn PDF document text
    • http://hanleyresources.com/images/fupudomudixusiz.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136e6c2df48b---12735628602.pdfIn PDF document text
    • http://gsemilia.it/userfiles/files/legiw.pdfIn PDF document text
    • http://abwninemile.com/uploads/files/73480952099.pdfIn PDF document text
    • https://aukshanya.promosing.com/alpha/ckfinder/userfiles/files/33889219438.pdfIn PDF document text
    • https://bulgariapools.com/contents/files/takesozanevuminaku.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/23210534656.pdfIn PDF document text
    • http://skupka23.ru/upload/m/33220521682.pdfIn PDF document text
    • https://www.smartfutureexpo.com/ckfinder/userfiles/files/28626771856.pdfIn PDF document text
    • https://rodolphe-blanchet.fr/Rodolphe/fckeditor/file/vuxomemuka.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/0aomemo9pkb4au0kmsptag64vu/ponipagozudabawulewozoze.pdfIn PDF document text
    • http://ambvetsanprospero.eu/userfiles/files/90895337793.pdfIn PDF document text
    • http://happyorderfood.com/uploads/files/wesevopimusenevekorewuzo.pdfIn PDF document text
    • http://855solution.com/htdocs/cljr/data/files/45666782036.pdfIn PDF document text
    • http://pjteam.hu/uploads/xivoneb.pdfIn PDF document text
    • http://farmina.ru/uploads/files/65711193661.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=block+hexa+game+online+unblockedPDF link annotation
    • 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_off0000da97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA97 19404 bytes
SHA-256: 250bda9762af8c65593dc5abe5c594e4702759ac9bc980fac788b9330b548b22
font_01_sfnt_off00010c82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C82 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012499.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12499 10940 bytes
SHA-256: ab6b61169a474dd6785f81f307c295077e91a258cb1cb66e3d24012318bfe6d0