Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f6c978e49560126…

MALICIOUS

PDF

70.0 KB Created: 2021-09-07 09:58:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 31ddc2935ce1b3515e2c9a39961c97ae SHA-1: 66bad37d7bce3b79a7a4812dab77ae9e52e07af8 SHA-256: 6f6c978e4956012610cdd16cda8b7e817c84c139b7e9573da0f42bd0c8430767
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS uploads. While no scripts were directly extracted, the PDF structure and link farm behavior suggest an attempt to redirect users to malicious sites for further exploitation or phishing.

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 https://ohcsi.com/ckfinder/userfiles/files/sasajisibalijogotujib.pdf In PDF document text
    • https://aymfly.com/aym_image/files/77822516811.pdfIn PDF document text
    • http://podushka.by/files/files/fekadesozirizes.pdfIn PDF document text
    • http://24horasnoar.com.br/ckfinder/userfiles/files/41680433553.pdfIn PDF document text
    • http://www.bargiel.com.pl/ckfinder/userfiles/files/69123243127.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/092bd639c0cad34ac48972afbd0b8109/89648312026.pdfIn PDF document text
    • http://dlmberatung.ch/userfiles/files/wibitavemisirekewiwop.pdfIn PDF document text
    • http://rdasesores.gestconcursal.com/editor/ckfinder/userfiles/files/23311314535.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/lhilu7phnjt9amuen99903h3na/veginilabexiwosugupir.pdfIn PDF document text
    • http://crystaltrade.hu/data/file/jopebefuwalakipas.pdfIn PDF document text
    • https://la-klamm.org/userfiles/file/levinojavaweletawedamozin.pdfIn PDF document text
    • https://editions-tlp.fr/ckfinder/userfiles/files/89746852825.pdfIn PDF document text
    • https://mbzgogo.xyz/web/img/podborky/files/telufolatelafovafatozoxig.pdfIn PDF document text
    • http://soupworld.de/upload/file/tololaxanulinesoz.pdfIn PDF document text
    • https://www.lipca.com/ckfinder/userfiles/files/lepujizojavakeg.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160b593da90552---gamusopatisu.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16113a6e98ecd5---17939654132.pdfIn PDF document text
    • https://wavesmaroochydore.com/wp-content/plugins/super-forms/uploads/php/files/is24kdpcn0hk1m4kd955aen2ek/romaxiki.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/c6796fb761ffdfa85bd85dd52f238669/94206161636.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/16078bea568505---27736655000.pdfIn PDF document text
    • http://bahattinburyan.com/userfiles/file/28977381291.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/160e1f91888192---wuvobevukazuwom.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/9984d989eae8e28095a5a8bac37f7c75/mabokazarijorusalun.pdfIn PDF document text
    • http://yuanjen.com/ckfinder/userfiles/files/97346387253.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=power+system+transients+notes+pdfPDF 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_off0000b542.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB542 14224 bytes
SHA-256: c8b27492cd4a54ebfb6b84c3926a0dc4555a1fa995c92f91611f2c5fef14e14d
font_01_sfnt_off0000d89f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD89F 10812 bytes
SHA-256: 83ccce860a46b3fd42fd03bd7a3ff8ace2d24c919fafaa8c78afa5834b07fc29
font_02_sfnt_off0000f1b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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