Malicious PDF — malware analysis report

Static analysis result for SHA-256 45e150d9c2d5d86e…

MALICIOUS

PDF

87.3 KB Created: 2021-08-09 18:05:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: cf1bc94586fb528bdd4ee57d77ca8961 SHA-1: 0e0cfe6d612b9bd4c0a264c489d369bf249bad8c SHA-256: 45e150d9c2d5d86efe0dde1dfcd064ef6a8f91becd7711b643db4ca090a6e099
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF contains a large number of external links, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to lure users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9933

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://myjobcareer.net/userfiles/file/2021052515271373499.pdf In PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16090ae846c899---zosuvarixejozawasewegofi.pdfIn PDF document text
    • https://www.alapan.org/fckimages/file/50241579417.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16070f682a1c27---nosim.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///95470989063.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b181ddf804---55712334917.pdfIn PDF document text
    • http://soft-pro.hr/upload/datoteke/jisemuletavusogimat.pdfIn PDF document text
    • http://assistance.uz/images/shared/file/jelukedumoxonizi.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082bf0b47a14---paxejobijakuf.pdfIn PDF document text
    • http://ziva-muzika.cz/files/file/79182342320.pdfIn PDF document text
    • http://abwingscolley.com/uploads/files/22567561717.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7c1640da59---gurolezamov.pdfIn PDF document text
    • http://amctop.com/board_data/editor_img/file/202107032226.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1610b5e8094320---kefizegu.pdfIn PDF document text
    • http://bangdinhphucat.com/quangbasanpham/app/webroot/upload/image/files/vunem.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae2ef4f2a99---wutejomekisujit.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/88237894734.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad299782f25---xekup.pdfIn PDF document text
    • http://project-lovcen.me/userfiles/file/sinukoragi.pdfIn PDF document text
    • http://bulk-supplies.com/userfiles/file/21161367648.pdfIn PDF document text
    • http://cadelupo.it/userfiles/files/pinafukaboxeb.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160c45d74d87a8---39695236223.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/9899403389.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b44b36af0b1---6909317565.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=english+b1+grammar+test+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d785.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD785 16508 bytes
SHA-256: 769942884e4d381c394e19081ee48897751ba3127cc30a320accb1ac0b98b9ef
font_01_sfnt_off0000ee6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE6A 17580 bytes
SHA-256: 91c155f50a666477bb30d6f8c90d222f7f2274f648c45c3b0e363b49fbdf0b05
font_02_sfnt_off00011b59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B59 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00013370.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13370 11000 bytes
SHA-256: d1af7f051d7ad84fe681378a11b4cb6de02d21ada9dced92cb5df584b7b16ce3

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