Malicious PDF — malware analysis report

Static analysis result for SHA-256 f896e6fb69a86a11…

MALICIOUS

PDF

77.9 KB Created: 2021-08-18 18:54:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3e68bab0e08d81f641091f6ce04a22b5 SHA-1: 038b10fc74c903189ce7a341c78cf3695442d711 SHA-256: f896e6fb69a86a113a658041d6401fd00103bbe108638942223bf5a4b5c614c0
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The document body is heavily obfuscated and unreadable, providing no direct content clues, but the heuristics strongly indicate a phishing or SEO poisoning attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://augsburger-dartliga.de/uploads/file/70447698124.pdf In PDF document text
    • http://miraesusan.com/ckupload/files/kizorusepexolibujebipab.pdfIn PDF document text
    • https://epponline.com/mentorfinancial/page_images/file/keneduturodok.pdfIn PDF document text
    • https://www.pactforfamilies.org/ckfinder/userfiles/files/19975373003.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a47b2a071f8---mepogomok.pdfIn PDF document text
    • http://saeronbio.com/userData/board/file/papexikapuk.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/48e0a0b317f7b59a73d1e6d8b791e1e0/89831937396.pdfIn PDF document text
    • http://gospel-pour-100-voix.com/fichiers/newsletter/file/kibuzalaxunefife.pdfIn PDF document text
    • http://ktcz.eu/files/files/gumafisizoxawipix.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a1ec1fd92ab---6192953148.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/3e456911e049be3d088422f67b9fb536/satovuz.pdfIn PDF document text
    • https://corpusbg.com/files/fck/file/kumogetebobukakuxo.pdfIn PDF document text
    • https://hogies.com/includes/template/uploads/file/30971491665.pdfIn PDF document text
    • http://benetalent.com/upload/files/bokosomobolowamixezixebut.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dbace40b8c6---tokemawenanudarawa.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/fewerotadotawowotoxi.pdfIn PDF document text
    • https://coil.hk/upload/files/51610327433.pdfIn PDF document text
    • http://lpc2529.com/piceditor/file/15408910967.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c39bdee15cc---75745068250.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/3b62e04d62fbf3562a65e711264978d7/pezalitunebukegixereg.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/i8g87tmorurcd54evmb9geuog1/70158365158.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bedb3f85e2a---viwego.pdfIn PDF document text
    • http://flygarfield.net/userfiles/file/44821397584.pdfIn PDF document text
    • http://turskazka.ru/ckfinder/userfiles/files/96948269762.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=angularjs+bootstrap+4+template+adminPDF 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_off0000cb50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB50 11164 bytes
SHA-256: b00de0cbd6b59c16b6b615bd2be3308c3175f14c286848106e3198f740429850
font_01_sfnt_off0000e4fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4FD 17112 bytes
SHA-256: 5dbeaffe4c6a627f16be7dbae5c85fcc0deaad9ff3087d3ed704b3affec3bf04
font_02_sfnt_off00011206.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11206 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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