Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cd8df41c68e9cb7…

MALICIOUS

PDF

85.5 KB Created: 2021-07-15 22:46:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 56cd31d6267fb65b04fad4c3e828dec2 SHA-1: 585c1dc62bd59937ccb196deeda52de27748a8bf SHA-256: 0cd8df41c68e9cb7eff8297f65e7a70726f56b6d448c678f7a93603fe8b4c42a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to external websites, many of which are hosted on compromised CMS uploads or disposable domains, indicating a link farm designed to redirect users. ClamAV and ML classifiers identified this PDF as malicious, specifically flagging it as a phishing trojan. The presence of embedded URLs and the nature of the heuristics strongly suggest an attempt to lead users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/fdc7eb8f1f3083dc07afaee960cbdf73/xizakaxuna.pdf In PDF document text
    • http://debschoen.com/userfiles/file/pimirutanivowupafedubiguw.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a80d6c6622e---12648001387.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609ed0fa3188e---fipajasodubozanekorak.pdfIn PDF document text
    • https://kund-in.com/userfiles/file/79818461065.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/76n577r15bcddsq4vkf0snj2l4/nedisakiraw.pdfIn PDF document text
    • http://digitalpolicycouncil.com/imagenes/file/fofitajovolojebixi.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/c5665556f7e0165379d7b7aa1191e130/sizizuzuposogojatuxe.pdfIn PDF document text
    • https://gs-hemeringen.de/ablage/userfiles/files/46948910181.pdfIn PDF document text
    • http://thetachikappasigmaalumni.org/clients/5/56/56ac51e2ee760b54d3ff8b7d53c877b7/File/zirosedoxiker.pdfIn PDF document text
    • http://kopdesign.nl/userfiles/file/gumisirotokejonowe.pdfIn PDF document text
    • http://kimbuunguyen.com/uploads/userfiles/file/dujas.pdfIn PDF document text
    • http://niezapominajkowo.eu/userfiles/file/15127425236.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4c43e1490---51946260915.pdfIn PDF document text
    • https://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/5faa55105d9f00405906e9c10fcf6e70/niworaxobedifelejadugebi.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160ad8b5cc452b---xexelu.pdfIn PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/th0u90jj2o2j55g7p05i3jfs6f/tiriz.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3ab06beb87---sipev.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/14e5a55df8af8451638bc91ee6ef25e6/55148977958.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a48bd532321---mevadefoferexefazeg.pdfIn PDF document text
    • http://stardentalcare.org/userfiles/file/gojotekulakozunof.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160875a1f97303---buzodikazamib.pdfIn PDF document text
    • http://acril.ru/ufiles/files/nenogulobafog.pdfIn PDF document text
    • http://computergramm.com/userfiles/file/41598828349.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=17+day+diet+chicken+recipes+cycle+1PDF 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_off0000eae4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAE4 16660 bytes
SHA-256: f9f0bf17e283eff389f4012c85b89b38f3552ad19ba12758a99f1ef85c1a710e
font_01_sfnt_off00011667.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11667 10704 bytes
SHA-256: f2b5ce3274aa8ce55561081f2ef56d1cadd5e4dd00bc403f4065e3e39bec8f6a
font_02_sfnt_off00012ef8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EF8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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