Malicious PDF — malware analysis report

Static analysis result for SHA-256 66fda7828e3dd5f6…

MALICIOUS

PDF

90.0 KB Created: 2021-08-25 05:49:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: e9d7fb0186ac34823447235e40bc8cd1 SHA-1: b57f1752004bed2ae86b747b61cdef093874cec5 SHA-256: 66fda7828e3dd5f68905acc511b22528462a59e3faf594a4b60dec868f9a6f51
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and link farms indicates an attempt to lure users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://ketchas.ru/uplcv?utm_term=really+offensive+insults PDF link annotation
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608a58b10e095---41088523375.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6f8b531d0---lukitovewilirurinew.pdfIn PDF document text
    • http://cafemsoffice.com/userfiles/files/33193935652.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6b097baeed---50365195519.pdfIn PDF document text
    • http://emmanuelmissionarybaptist.com/clients/74938/File/51300560949.pdfIn PDF document text
    • http://grandinhr.eu/images/user/file/60388105039.pdfIn PDF document text
    • https://ketex.com/trcgp/ckfinder/userfiles/files/88691473473.pdfIn PDF document text
    • http://w-w.cn/isee/pfm/cms/uploadfile/fck/file/39069128370.pdfIn PDF document text
    • http://pixel-pro.ru/upload/file/vanamafuxupepo.pdfIn PDF document text
    • https://profm.hu/files/file/jaxerilimokar.pdfIn PDF document text
    • https://www.ideaklinik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ef6f146e31---52861830523.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac3fc7bae87---2317347479.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/e42ae2dc9ba2bdc0f939d3509fa43115/tisevupitozovugoga.pdfIn PDF document text
    • https://tanasiri.com/piceditor/file/69843334769.pdfIn PDF document text
    • http://www.darvidproperty.com/news/file/wuzatugesevefamefizon.pdfIn PDF document text
    • http://yacpa.org/yacpafiles/file/87220784869.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a094e718336---99720017935.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/ijs0q511clare4uq7obc2b8984/kutixakikezuwalez.pdfIn PDF document text
    • http://atek-ent.com/upload/file/rosamewowosives.pdfIn PDF document text
    • https://xn----7sbbjg7ctfs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/08f8fc98eddb090cabf13b82e75c0c36/26289475627.pdfIn PDF document text
    • http://verduciautodemolizioni.it/userfiles/file/49471114274.pdfIn PDF document text
    • 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_off0000fa30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA30 18540 bytes
SHA-256: f945ab4857c1feadfeea85d7e806122883cef414363ec573b966a16b662b634c
font_01_sfnt_off00012a18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A18 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001422f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1422F 10432 bytes
SHA-256: 96b10b4e79e7ecb7d51e04e8c46f8ad09e05d95a376d1cb09deb62227e24c35d

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