Malicious PDF — malware analysis report

Static analysis result for SHA-256 a074346c8bd3e68c…

MALICIOUS

PDF

69.2 KB Created: 2021-09-28 08:53:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 984e691dddfd949cb299766dd0cdbc89 SHA-1: 7bf4b869027ba545db8e073c436df8f7fc65e66e SHA-256: a074346c8bd3e68c45f742c51db94644e9f8aa431d400178e7ef2e6f135ca905
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to various domains, many of which are identified as compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO poisoning to redirect users to harmful content. No scripts were extracted, and the document body was unreadable, but the link farm structure is a clear indicator of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://issaproject.com/app/views/panel/ckfinder/userfiles/files/69715863394.pdf In PDF document text
    • http://stin-verdon.fr/assets/Image/files/lojelenukupidetowesuv.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/b8cff38e1bb553ff1c599b51d22632fa/13427265113.pdfIn PDF document text
    • http://omni-links-europe.com/images/blog/file/47471511105.pdfIn PDF document text
    • http://getdol.com/page_data/file/boresopolazel.pdfIn PDF document text
    • http://stringquartet.biz/web/images/fck/file/nejasiwusitibowezove.pdfIn PDF document text
    • http://haokunchem.cn/upload/files/wirozaxo.pdfIn PDF document text
    • https://kp-bs.ru/upload/files/24611167137.pdfIn PDF document text
    • http://legalinet.eu/userfiles/files/pezibudanidogo.pdfIn PDF document text
    • http://sloplast.com/userfiles/files/61575665880.pdfIn PDF document text
    • https://hoongnau.com/upload/files/47908122758.pdfIn PDF document text
    • http://dnt-mayak.ru/content/File/duneliz.pdfIn PDF document text
    • https://tomorrowhubs.com/upload/users/files/76277461722.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/20605543747.pdfIn PDF document text
    • http://droneducational.com/admin/userfiles/file/52330679233.pdfIn PDF document text
    • http://khodahoanglang.com/admin/webroot/upload/image/files/60096005082.pdfIn PDF document text
    • https://topinsolventa.ro/userfiles/file/liwusilateduviwep.pdfIn PDF document text
    • http://kbinteriery.cz/userfiles/file/72063397897.pdfIn PDF document text
    • http://sarigol.kr/userData/ebizro_board/file/reniribojolobodesut.pdfIn PDF document text
    • https://anandalaya.in/resources/file/beluzudadoje.pdfIn PDF document text
    • https://shevian.com/images/file/jewun.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1613ca89e86563---jagonavuxele.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/869acd1d60b8aee71b2aec1b4d9142c9/tatinutejomovujapos.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=carrom+clash+mod+apkPDF 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_off0000af11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF11 10476 bytes
SHA-256: 990ce70aea2e18793762aed063b32e43a99814456d88effaccfd3454e378b713
font_01_sfnt_off0000c6de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6DE 16096 bytes
SHA-256: 673f1935ae34c40adcd871b83c16f21348571a69d974686395b7bc025c59b2d7
font_02_sfnt_off0000ef72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF72 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1