Malicious PDF — malware analysis report

Static analysis result for SHA-256 8258bc1b95e11873…

MALICIOUS

PDF

68.8 KB Created: 2021-09-30 10:24:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 54724e23016d03d32feb37f6eaae7356 SHA-1: 38c2ac6656a2a00c014eb80435779663f982043b SHA-256: 8258bc1b95e11873b4b8329ea3cd833f5458ca3355fcb22cff717b1e471f417d
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm pointing to compromised websites. Several heuristics indicate the PDF is designed to host external links, with one specifically identifying a link farm on disposable hosting and another pointing to a compromised WordPress upload. The presence of these links suggests an attempt to redirect users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://www.parinet.fi/tiedostot/files/gelosifelufewurepipovo.pdf In PDF document text
    • https://maffart-guy.com/userfiles/file/gukokibodimota.pdfIn PDF document text
    • http://scarpatti.com/files/58202794669.pdfIn PDF document text
    • http://yizhu580.com/ckfinder/userfiles/files/74946641170.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/161489a115ffa9---gumitaviwunadupifufabame.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/6umuct0q13uvjbev5nc3huk0c4/88776211553.pdfIn PDF document text
    • https://widerbet.pl/userfiles/file/fuborubabuwenogudum.pdfIn PDF document text
    • http://icoenergia.com/userfiles/files/vekijusexigedezupo.pdfIn PDF document text
    • http://studioambienteterritorio.it/userfiles/files/naforawu.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/adce7389d82d41eb361f06d7b48b3bea/92190967163.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/20043d351e5f1e634bd27cceab7847b2/badariwafazewepobisunosov.pdfIn PDF document text
    • http://serdceprirody.ru/userfiles/file/tiwolid.pdfIn PDF document text
    • http://tcsm62.org/uploads/news/file/75507703647.pdfIn PDF document text
    • http://dywin.com/uploadfile/files/xutafuxozerifufufitupuf.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1613d8bfedee95---fupabofinosowalilubakapa.pdfIn PDF document text
    • http://duda-tech.pl/dudatech/upload/file/79227798253.pdfIn PDF document text
    • https://defi128.phpascal.com/userfiles/files/55827084384.pdfIn PDF document text
    • https://flyags.com/editorResources/file///wotoxetumisiratuditodip.pdfIn PDF document text
    • http://motty-etai-sharon.com/files/files/zosilut.pdfIn PDF document text
    • http://www.anglometais.com.br/adm/Editor/ckfinder/userfiles/files/10428826768.pdfIn PDF document text
    • https://bccphil.paramedix.biz/uploadfiles/file/vimasenisatujikuzutoj.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/rkqlrdgde3b9lf4f5dltjuq0e3/14901960813.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/161450d4899cca---20115344834.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=android+tv+mouse+cursorPDF 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_off0000b1e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1E9 10468 bytes
SHA-256: d727a3ad76bef1a57971bf0f4ed8843441f5dc1b5b3a49ae3bc980f2429b36e6
font_01_sfnt_off0000c9bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9BC 14240 bytes
SHA-256: c5229746a555be560788c12c5344dd9cf2907abc50885e37da901975ac1c84ba
font_02_sfnt_off0000ed62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED62 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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