Malicious PDF — malware analysis report

Static analysis result for SHA-256 0423c1722e7399e4…

MALICIOUS

PDF

167.6 KB Created: 2021-07-27 20:00:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: ddd2452c2498180291361b93423db354 SHA-1: e0f7670125e395dfa6a9669540e51afad69c9ac6 SHA-256: 0423c1722e7399e45af154ecc089157b9f2fea725230588b894ed39384a942d7
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious. It contains numerous links to external sites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a link farm designed to host malicious content. The critical heuristic 'SE_SECRET_RECOVERY_LURE' indicates the document's primary purpose is to trick users into revealing sensitive recovery secrets or private keys. No scripts were extracted, but the presence of multiple URLs and the nature of the lure point towards a phishing or credential harvesting attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9959

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/160910c4579637---73244280729.pdf In PDF document text
    • https://alirezamirmohammadi.com/images/upload/files/27320614228.pdfIn PDF document text
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/7ecu0he1n2l9civ82jbhpffoau/jekoxudez.pdfIn PDF document text
    • http://appartenvue.net/appart/upload/images/worijididutotopor.pdfIn PDF document text
    • http://mariamozharova.ru/uploads/files/79849490374.pdfIn PDF document text
    • http://uniquecharacters.com/upload/files/lujike.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/files/7439938340.pdfIn PDF document text
    • http://bigxra.com/uploadfile/file/2021052614385173499.pdfIn PDF document text
    • http://rauvuonsach.com/images/uploads/files/8748184271.pdfIn PDF document text
    • http://rurisnet.org/images/file/95504086080.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/lm70g2tqhka6btj8ij89lc3i99/niligiwapenewe.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/1vqqfo8t1o758vacqcsqviqu11/98805477374.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/d288aca2076e4cc26ef81fa03c07c2b3/zelagagewemano.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/nep6qkkgb7r029psl7v7h7vms3/86750359209.pdfIn PDF document text
    • http://jnnycc.org/userfiles/file/mefidegizoduxafowobijega.pdfIn PDF document text
    • http://josepholszowka.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/16198653632.pdfIn PDF document text
    • https://itchanoi.vn/uploads/news_file/90392382723.pdfIn PDF document text
    • http://barcelonahotel.vn/UpLoadFile/file/kabosufezipaximolekuv.pdfIn PDF document text
    • http://aprendanow.com/wp-content/plugins/super-forms/uploads/php/files/8897c6902ab9fc7a3bc4382eee9fd93d/duvawakanijopaw.pdfIn PDF document text
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c9eb9d9b42---81579188533.pdfIn PDF document text
    • http://soupworld.de/upload/file/24224531852.pdfIn PDF document text
    • http://yjsyrj.com/userfiles/file/63970844563.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c94019d48ae---zeworuvaguze.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=fl+studio+mobile+apk+obb+free+download+full+version+2021PDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00022d16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22D16 18124 bytes
SHA-256: f9e09e7d6c1b4e566737578e17ffcd8b126343e580293196b89c37e8580a3b0f
font_01_sfnt_off00025cb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x25CB0 11416 bytes
SHA-256: 88d89e539dcb8882393cfdd91d3eb18c5848270a1700759253fe80cf7cff7f91
font_02_sfnt_off00027785.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x27785 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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