Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e9dbf7fb7480184…

MALICIOUS

PDF

70.2 KB Created: 2021-09-02 06:16:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: fd843c859ed070e0ebf5c9af7e509d37 SHA-1: f952d98feacbb95c070ec0b1a8f490043ded83d6 SHA-256: 9e9dbf7fb7480184959425b77f703c290bbc7cd46b034f19282f4109c4168bee
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 hosted on compromised CMS upload directories or appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as phishing or a trojan. The primary attack pattern involves directing users to external, potentially malicious, websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 http://salonorganica.ru/upload/files/lojisimiribo.pdf In PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/898149a66938edc6224462cfd9c6be60/dagikopekamafeputi.pdfIn PDF document text
    • https://tutorsbureau.net/userfiles/file/56624498636.pdfIn PDF document text
    • https://baigiangtoanhoc.com/upload/files/joxodajedudubupow.pdfIn PDF document text
    • http://music-saikung.com/ckfinder/userfiles/files/78000834327.pdfIn PDF document text
    • https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/34796460ddb85b695b5c7e81746285a4/jedamulekutagimajofuve.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608f4a2922d31---feledojezabiludisawejaxiw.pdfIn PDF document text
    • https://9ja-bet.com/userfiles/file/19719714111.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ada7a022a18---fuvajijib.pdfIn PDF document text
    • http://school19-zav.ru/userfiles/file/79157611106.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/531edf46d830b6000d8609069994b391/dedoxugati.pdfIn PDF document text
    • http://eau-msu.ru/ckfinder/userfiles/files/zuniniradiralofopa.pdfIn PDF document text
    • http://teplospectr.ru/images/files/bibesekudekerasaxegufupux.pdfIn PDF document text
    • https://hongmao.tw/uploads//files/202108081344148262.pdfIn PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/f868fc99a6a0a28254da057f33aff603/62675792059.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f74a1988ff4---96228498253.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609be233ae8cd---20269856721.pdfIn PDF document text
    • http://congtyvima.com/images/Download/sunafupikidekumegonoxiruw.pdfIn PDF document text
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/74252949965.pdfIn PDF document text
    • http://www.fashiongale.ro/userfiles/files/56169935006.pdfIn PDF document text
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/2e069ef24de8ff90c0d12727dc32c21a/gilekefisiborinodoru.pdfIn PDF document text
    • https://ewt.cz/res/file/48446235928.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/j4r8c06bk1shhihvfem10e68k2/wakujozepilokanike.pdfIn PDF document text
    • http://fresh-j.info/images/uploadedimages/file/38851721217.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=french+car+makersPDF 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_off0000b4e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ccf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCF4 15848 bytes
SHA-256: ea68a7355bab4cd2e0fa24f863f0cd349b12fe82fda48c029603202a17173eab
font_02_sfnt_off0000f562.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF562 10208 bytes
SHA-256: 0850038a338d0f8e32365f59cf6819544c33b2e1a0aafcdd9e60e412f572217c

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