Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1b199e2237d14d4…

MALICIOUS

PDF

95.4 KB Created: 2021-08-20 03:59:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9ed95c28c5a963291c741459e1198c5e SHA-1: 8b4df368cb95f7a83ea424fda6299b9b9f5bc21e SHA-256: c1b199e2237d14d46818511dc59a073e8472cc634cfee45d137b58cdccca99ad
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. The heuristics indicate it functions as a link farm, containing numerous URLs pointing to various websites, some of which are hosted on compromised CMS platforms. The primary purpose appears to be redirecting users to potentially malicious or phishing sites, rather than delivering a direct payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://syteq-pro.com/userfiles/file/bitotemidutog.pdf In PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606eb900a8081---sugavukepemolow.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/8de97938f8062c6c98ccecf419757b8a/6660151133.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd1b3e732a---60087055527.pdfIn PDF document text
    • https://guclupin.com/calisma2/files/uploads/33013114984.pdfIn PDF document text
    • https://wagaskar.com/media/fesenoda.pdfIn PDF document text
    • http://xn--brneneskontor-landsforening-b0c.dk/userfiles/file/pefusexutixeku.pdfIn PDF document text
    • https://travolution.travel/wp-content/plugins/super-forms/uploads/php/files/149dfd9d055acfb3f6eaf113534abc95/41492451892.pdfIn PDF document text
    • http://scherzerpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/89314814256.pdfIn PDF document text
    • http://ulrike-mayer.de/userfiles/files/41140535778.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc0bb52786---3943835136.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c0548a7dee---revitixadupizanapelominu.pdfIn PDF document text
    • http://se-ty.ru/uploads/userfiles/file/46963330935.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/rkqc3e8nbup2oui27qokak2671/vuvuvadowejikonaju.pdfIn PDF document text
    • http://technoculture.cz/admin/upload/file/26186444146.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a55a3dd325c---43849740312.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160925e13d37d3---zuxizumut.pdfIn PDF document text
    • https://www.sonorisation-auxerre.fr/ckfinder/userfiles/files/52201237682.pdfIn PDF document text
    • https://nikken-engineer.jp/export/sd205/www/jp/r/e/gmoserver/8/6/sd0748886/nikken-engineer.jp/fckeditor/upload/file/palorukegovafus.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160768701844f4---punugerekejulonivilugura.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608751e66001a---38322993228.pdfIn PDF document text
    • https://supermagnum-bg.com/userfiles/file/79185411512.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/16103bfbc48847---9637024543.pdfIn PDF document text
    • https://nada70.org/userfiles/file/26963887236.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=web+programming+pdf+tutorialspointPDF 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_off00010f46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F46 18032 bytes
SHA-256: 087942b2a8bd7e7687fe645dee5c57375d7168fc89933d79693ed2446936f898
font_01_sfnt_off00013e6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E6E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015685.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15685 11072 bytes
SHA-256: 7c4b99cd240a7e870deae09c95bfef1c05b16248d86e1ef90e592e9791492236

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