Malicious PDF — malware analysis report

Static analysis result for SHA-256 a30db7f063cec356…

MALICIOUS

PDF

74.1 KB Created: 2021-09-15 12:35:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 90edb0c0fa4bcc494e09021e47bd612a SHA-1: 19974d3447c3ead983f03f7241760c481bb8484f SHA-256: a30db7f063cec3566090e50b33bc64adbb96bc5d4931211ec8f7717a15ac5d95
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF that contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm for SEO poisoning. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to trick users into downloading further malware. No scripts were extracted, and the document body was unreadable, limiting the analysis of the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://tsrmvolontari.it/userfiles/files/63275664031.pdf In PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/jipobiviku.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613c98784c76e---13103096381.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1612f0877c057d---75285730829.pdfIn PDF document text
    • http://hakasasi.id/userfiles/file/94881891824.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141832e88c2a---22500066932.pdfIn PDF document text
    • https://www.educazionesessuale-scuola.ch/ck/ckfinder/userfiles/files/76745736924.pdfIn PDF document text
    • https://careersourceokaloosawalton.com/files/public/96985675490.pdfIn PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///76983082627.pdfIn PDF document text
    • https://kisikana.hr/UserFiles/files/34969610187.pdfIn PDF document text
    • http://perilatomsk.ru/ckfinder/userfiles/files/wugumovaremewuvafidibodi.pdfIn PDF document text
    • http://musicfriend.vn/public/default/ckeditor/files/vominofajixisulirip.pdfIn PDF document text
    • https://drhuanghair.com/uploads/files/202109140452502970.pdfIn PDF document text
    • http://myrbacken.se/login/ckfinder/userfiles/files/tujasogowupoxugedivuneke.pdfIn PDF document text
    • http://asbazainville.org/userfiles/file/gawobemuzogog.pdfIn PDF document text
    • https://pasationtravellers.com/root/FCKeditor/file/mutosaraxekaja.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d7c27efbb7---fixizileme.pdfIn PDF document text
    • https://gdaniec.com/upload/files/88675921734.pdfIn PDF document text
    • http://franklcalabreseattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/75898068218.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/16132fc6849acb---59874613961.pdfIn PDF document text
    • http://khaskhaan.mn/uploads/userfiles/files/8875104455.pdfIn PDF document text
    • http://yalcinsezer.com/upload/ckfinder/files/55170756578.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=download+manga+bleach+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_off0000bf00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF00 10836 bytes
SHA-256: 59eb4d9300034b89532afb723bf2136cf8afb29aa49897cd92b3b146d571474f
font_01_sfnt_off0000d765.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD765 16916 bytes
SHA-256: 0e97dd84b8a057281ea52e1511a85f447a4ec2c124ee568c882dfa925e5d1c0a
font_02_sfnt_off00010289.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10289 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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