Malicious PDF — malware analysis report

Static analysis result for SHA-256 c46f242dad823d65…

MALICIOUS

PDF

72.7 KB Created: 2021-09-25 08:49:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a7fcf2ecc6d6218f2c5032bf9aa33481 SHA-1: b5583dfeab3b8c9a4035c5bf30d66b44d5c37c5c SHA-256: c46f242dad823d65d6294f1ebe056de0e0621a8cb7b66fcb9128a616c5def09e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS platforms. While no scripts were directly extracted, the nature of PDF link farms often involves JavaScript to facilitate redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://jocoseatee.com/userfiles/files/gonebofogigomawexoj.pdf In PDF document text
    • http://vetportonaccio.it/userfiles/files/76071539402.pdfIn PDF document text
    • http://xn--42cfa4ewb0a0b3fwh.com/imageupload/files/radovugudonime.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131f145020e0---gavejakonasumajomami.pdfIn PDF document text
    • https://nikosdimos.gr/userfiles/file/77225461685.pdfIn PDF document text
    • https://sskundal.com/userfiles/file/wexuzepoduwi.pdfIn PDF document text
    • http://birizgardenhotel.com/userfiles/file/6416897571.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16134fae5a9270---66843753849.pdfIn PDF document text
    • https://birudongker.com/contents/files/pusiruxazujevusux.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613f704931f4e---suvesew.pdfIn PDF document text
    • http://kuwaited.com/cote_dor_import/admin/ckfinder/userfiles/files/kazitagevigopujofidif.pdfIn PDF document text
    • http://sportsgarten.com/editorData/file/woboloxinoduvew.pdfIn PDF document text
    • http://zangerlelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/95125698559.pdfIn PDF document text
    • https://renesens21.com/ressources/upload/files/87239598739.pdfIn PDF document text
    • http://vin-baietii.ro/ckfinder/userfiles/files/jelagonubod.pdfIn PDF document text
    • https://marblo.com/app/webroot/img/files/lakevokemoxeweti.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16138210f45e35---walofejategasatazuduk.pdfIn PDF document text
    • https://777mto.net/contents/files/76984842553.pdfIn PDF document text
    • http://mayinluatudong.com/uploads/userfiles/file/38062854866.pdfIn PDF document text
    • https://btsis.com/upload/ckfinder/files/lekunilafoguxini.pdfIn PDF document text
    • http://teamtrinity.net/trinitya/file/putujusifelinigasivepula.pdfIn PDF document text
    • http://lscapital.it/images/file/41658646298.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=apk+left+to+survivePDF 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_off0000b95c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB95C 17628 bytes
SHA-256: 6b5e4c8921790f27abe3d54d42e0ef8f1c235cef45810462e1ef84199d380eb7
font_01_sfnt_off0000e5b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5B8 10324 bytes
SHA-256: f6bc68c2176afa9887acbfcf45932094a5775e84ec9497e4b6dba69cf6f6533b
font_02_sfnt_off0000fd3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD3B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1