Malicious PDF — malware analysis report

Static analysis result for SHA-256 586fb939c02cfe90…

MALICIOUS

PDF

80.8 KB Created: 2021-09-01 04:18:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ae55deb13fe2ebc7838a45a8c8b16cbf SHA-1: c96ca092f46df66f084871bf580d58499e1c8f89 SHA-256: 586fb939c02cfe90188f9ca8f0c39bf9d8944e55b6eb564d992701f2b4f3092a
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or other disposable hosting, indicating a link farm designed to redirect users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://palyavalaszto.hu/teszt/upload/file/96459594239.pdf In PDF document text
    • http://uceng.net/_UploadFile/Images/file/gaxovoduxapexudit.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/23aeb53a8d99b76076813961cc565ddf/18346639945.pdfIn PDF document text
    • https://erdenet.mn/userfiles/file/kaminaberorifadekex.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/2dd493fc1efa96d48a9e4f2191869df7/xawizepuxodano.pdfIn PDF document text
    • https://reniuved.it/file/zuxulinevexa.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/2e304bdc0124904ed2257dd308e16cab/50269844261.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/neoa32rho9r2c3u99fg92m4dr6/50377404161.pdfIn PDF document text
    • https://elesud.it/img_pagine/file/51978966861.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16115f08b0af1c---458028509.pdfIn PDF document text
    • https://iwanbim.com/userfiles/files/futunixilorujatexepugola.pdfIn PDF document text
    • http://solamsys.com/userData/board/file/2353357259.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160962da09ce8d---febanu.pdfIn PDF document text
    • https://www.tocbirsen.org.tr/ckfinder/userfiles/files/13887287263.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/24905154948.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bf96582b27---gixafaxid.pdfIn PDF document text
    • http://alessandrobelleseveterinario.eu/userfiles/files/mozutemajovunijazaraxobu.pdfIn PDF document text
    • http://dotacjedlaoze.pl/userfiles/file/maforakof.pdfIn PDF document text
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/bhl0ks2df2ub8cbkmnjheosnbd/4043422541.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160cb030531d02---98035423413.pdfIn PDF document text
    • http://reutlinger.pl/userfiles/file/53644252258.pdfIn PDF document text
    • https://havanic.com/cache/fck_files/file/69662157924.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=the+main+purpose+of+the+company+known+as+cr%C3%A9dit+mobilier+was+toPDF 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_off0000d0f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e910.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE910 11536 bytes
SHA-256: 84535a58abeb69622a5934372f67d7d3c78aa63900d3585be9c4dd7a6315ba67
font_02_sfnt_off000103c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103C0 18000 bytes
SHA-256: 13dd9b0c0ac71cf735f23f11c8e1ff045eb147875726ab897035fdf4c0ce9143

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