Malicious PDF — malware analysis report

Static analysis result for SHA-256 75300828e8314eee…

MALICIOUS

PDF

82.2 KB Created: 2021-09-05 20:27:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 39b4ca98809d9c8256d9421dbc7fc48c SHA-1: 5ff67b155af142ca18a11a3e255360b6d9d61e19 SHA-256: 75300828e8314eee47cfb159861c07c38959ec88ba3a1870c86cca82552c74a5
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites, likely to lure users into downloading further malicious content or phishing for credentials. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a tactic to distribute malware or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a125629ab09---68970503344.pdf In PDF document text
    • https://inunekocp.jp/mailmagazine/upload/files/watas.pdfIn PDF document text
    • https://harryfok.com/ckfinder/userfiles/files/vifewa.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c8fd2961db1---35021662952.pdfIn PDF document text
    • http://sysquare.com/UserFiles/files/40264473163.pdfIn PDF document text
    • http://americandeliorder.com/uploads/files/64876272067.pdfIn PDF document text
    • https://hinodanang.com/uploads/image/files/96930474666.pdfIn PDF document text
    • https://atlastoursntravels.com/userfiles/file/3532623120.pdfIn PDF document text
    • https://www.nrlandscapes.co.uk/wp-content/plugins/super-forms/uploads/php/files/a419b05e70c4f2c2a34a514c8c739745/42937939734.pdfIn PDF document text
    • https://www.hinkler.com.au/application/third_party/ckfinder/userfiles/files/83028729809.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d23768308da---23810401564.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/bd34dc108e5cd33f5563280c4ae28a3d/28924712765.pdfIn PDF document text
    • http://chapraptti.org/userfiles/file/91876531000.pdfIn PDF document text
    • https://tapetcenter.ro/app/webroot/files/userfiles/files/tafaxuva.pdfIn PDF document text
    • http://bielwod.com/userfiles/file/56120275396.pdfIn PDF document text
    • https://viratrip.com/basefile/travelasreviracom/files/ritaxuruzipuw.pdfIn PDF document text
    • http://93564497.com/userfiles/pivoxexapis.pdfIn PDF document text
    • http://cdkuysuujk.handysociality.com/upload/files/26077978384.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160984414144e8---92548873721.pdfIn PDF document text
    • https://greenlakepaint.com/ckfinder/userfiles/files/84556719631.pdfIn PDF document text
    • http://metall-press.ru/files/wovobuj.pdfIn PDF document text
    • http://yilip.net/userData/board/file/wulazutaxovimezajujo.pdfIn PDF document text
    • http://kondicionery-dolgoprudny.ru/upload_picture/file/19826949904.pdfIn PDF document text
    • http://jrmhandling.nl/upload/file/bijeterusizapuna.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=developmental+psychology+book+pdf+downloadPDF 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_off0000d8b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8B4 11376 bytes
SHA-256: 1441125f79f1c07639f973d3146769f221f3e2fb7ff14820e44ebed4d7ab1692
font_01_sfnt_off0000f309.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF309 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B1B 18408 bytes
SHA-256: 6c62bc48701ab0d69998be8041fe65eb1fa2b35fb0438c0197db69807ae4cc24

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