Malicious PDF — malware analysis report

Static analysis result for SHA-256 dabae36f2c6b33d1…

MALICIOUS

PDF

72.0 KB Created: 2021-09-01 21:33:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 342f45cca825da24249ae5aee9cfc9ac SHA-1: e5f87535a6f88af54e1f43189216e778e0d06354 SHA-256: dabae36f2c6b33d1443e383a3db8b0fef95f48c15857074c97941c976073b7cb
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and is identified as a link farm, with many links pointing to compromised CMS upload storage. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to phishing or malware-hosting sites. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://smidgel.ru/uplcv?utm_term=cocktail+class+near+me PDF link annotation
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a834c4e20e2---90784519948.pdfIn PDF document text
    • http://chayka-svg.ru/files/niwabedegasadol.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/cnt3i8lkjcscc13g3a47e945s7/91341218393.pdfIn PDF document text
    • http://hiredriver.com/uploads/assets/files/85758323156.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d1f4e19382f---wepukikunomi.pdfIn PDF document text
    • http://tecsun-moscow.ru/docs/file/49461551833.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/4e1dcd6c24e13606400c73a2557e3874/58518249591.pdfIn PDF document text
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076c09c182c7---94951759234.pdfIn PDF document text
    • http://palami.by/images/file/fekitixavapezon.pdfIn PDF document text
    • http://shreejians.com/userfiles/file/suzobopiwopusabimigud.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/23e0a4af4f7cd5c37c2acd20c3d1c456/xukezadalez.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1607b820c95b68---67267958918.pdfIn PDF document text
    • http://dansecyr.ca/pdf/file/44073157843.pdfIn PDF document text
    • http://everest-c.ru/ckfinder/userfiles/files/witawenilovinozuwamivame.pdfIn PDF document text
    • http://penzion-u-zamku.cz/files/file/92628841749.pdfIn PDF document text
    • http://joltiy.ru/uploads/files/nilarurixuzu.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/ivh5mocosdfhbv2k0afln4p974/13127188185.pdfIn PDF document text
    • https://aventura-agence.lu/userfiles/files/20414626006.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/a4082res55koof37ab8gmjq2lr/15649905441.pdfIn PDF document text
    • http://www.klimavill.com//data/editorfile/mowubuxot.pdfIn PDF document text
    • https://bamor.org/userfiles/file/kosalelebowafufewivo.pdfIn PDF document text
    • http://spiregene.com/image/files/20210626_114922.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/9aed568ebcc61eb96c2d2b49c17be9b9/nowoduxawi.pdfIn PDF document text
    • 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_off0000b925.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB925 10512 bytes
SHA-256: ec301c09f44d54d10c291c1296eb26ed431336bc0abfd01bd1f7371c2797189f
font_01_sfnt_off0000d116.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD116 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e928.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE928 16152 bytes
SHA-256: 555b419ad52ab4ee56a594595f8ace8c863576cef734c2f8dade8ecb204ca6f8

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