Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cba5359500ee278…

MALICIOUS

PDF

90.7 KB Created: 2021-09-17 10:49:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a2f2a98541bcaf76eb421dd0fe2cfe0a SHA-1: 775da660f7786ef2d1ce7445c1b9a1f475047d06 SHA-256: 9cba5359500ee27811fd80a4928f355d01ddaff7688f3787e49e0c8193a2a0b1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, forming a link farm. While no scripts were explicitly extracted, the nature of the embedded URLs suggests a phishing or redirection attempt, likely intended to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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://fanaf.com/article_ressources/file/bibolemuvig.pdf In PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/161422c316ffcf---27125182557.pdfIn PDF document text
    • http://alcantara.cz/data/file/lopaninusajusefopusasi.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613e4a7e935e1---4281791867.pdfIn PDF document text
    • http://xn--9p4b29dncp2cc6y.net/upload/fckeditor/file/21984508887.pdfIn PDF document text
    • http://aal.tw/uploads/htmlupload/files/rozuwofenebodumupu.pdfIn PDF document text
    • http://dlabiura.kbo.pl/ckfinder/userfiles/files/gatefigusojizos.pdfIn PDF document text
    • http://55pluscommunityspecialist.com/userfiles/files/rufunamadizokitimi.pdfIn PDF document text
    • http://mamnonhieutrung.edu.vn/ckfinder/userfiles/files/85779368625.pdfIn PDF document text
    • http://zoscm.zohukum.com/ckfinder/userfiles/files/29377359757.pdfIn PDF document text
    • http://e-sheremet.com/img/62976525731.pdfIn PDF document text
    • https://aluvioneschicamocha.sinecsas.com/ckfinder/userfiles/files/15434602017.pdfIn PDF document text
    • https://www.rapn.ru/ckfinder/userfiles/files/nemibidedijopusedenuwelax.pdfIn PDF document text
    • http://elitvorota.ru/f/file/lomegunekaxejoxawep.pdfIn PDF document text
    • https://indiachristian.org/uploads/files/24794552551.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/91cdf5079efeadabe10a33b6734463b4/40474695679.pdfIn PDF document text
    • http://geodez.com/pliki/file/46394312839.pdfIn PDF document text
    • http://naturalfurnish.com/userfiles/file/71155968677.pdfIn PDF document text
    • http://adaviestransportltd.com/userfiles/file/vixuvudoberajitejunera.pdfIn PDF document text
    • http://modelseafarm.com/kweb/ckfinder/userfiles/files/39132062167.pdfIn PDF document text
    • https://hagabb.ro/ckfinder/userfiles/files/7051798965.pdfIn PDF document text
    • http://3mfa.com/images/editor/files/5101604409.pdfIn PDF document text
    • https://dgssu.com/upfolder/e/files/20210905054734.pdfIn PDF document text
    • http://geoodwierty.pl/files/file/nagipafowululole.pdfIn PDF document text
    • http://mai-colle.jp/userfiles/file/xamepevegalewumefutelawew.pdfIn PDF document text
    • http://hndgyl.com/v15/Upload/file/2021961946233490.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=pc+and+android+cross+platform+gamesPDF 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_off0000fed1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFED1 10964 bytes
SHA-256: 066467ead82b1eb609bb000e1ef05872a0230b049cf7a0cbe97b530176b81d26
font_01_sfnt_off0001180f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1180F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013021.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13021 17232 bytes
SHA-256: feb8764bd455ffa95db63eecd783daa44824099eef17d84945250bc002ec6ae8