Malicious PDF — malware analysis report

Static analysis result for SHA-256 2804367cbdbe738b…

MALICIOUS

PDF

88.8 KB Created: 2021-08-12 09:04:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1864cf5f27de0efc0f8e67b37f84afb5 SHA-1: efce2fb8111c4d74f1035f4c1eeb0e8ea9a4cd00 SHA-256: 2804367cbdbe738b245a3425a2ff676656d212602c6bbb863b70c58a342cee8c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of techniques used to redirect users to malicious sites.

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://wastran.ru/uplcv?utm_term=what+is+the+purpose+of+the+souls+of+black+folk PDF link annotation
    • http://teakdeck.pl/files/file/gobalexuwemej.pdfIn PDF document text
    • https://stillwaiting.org/userfiles/file/65434382321.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3058988ca7---kibuwamojumofisuwirogu.pdfIn PDF document text
    • http://voorwindenotariaat.nl/app/webroot/files/ckeditor_files/files/90286524002.pdfIn PDF document text
    • http://dreiseengrundschule.de/files/41782636432.pdfIn PDF document text
    • http://stepasidemedical.com/images/uploads/file/16314633574.pdfIn PDF document text
    • https://aedwea.com/upload/foto/libozugonebeva.pdfIn PDF document text
    • http://africareview.in/userfiles/file/zutikawoxox.pdfIn PDF document text
    • https://itracmediav5.com/ckfinder/userfiles/files/xijokomad.pdfIn PDF document text
    • http://aprendanow.com/wp-content/plugins/super-forms/uploads/php/files/2ddfe0057a17e17aadda8aec0d2eee03/57230351999.pdfIn PDF document text
    • https://angkoronetour.com/userfiles/file/munolopupexo.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/aca8244b624cb2feb0740d1ff012dfc2/vexojijofi.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/d8agk9de14mog47ki9j7hv7ksb/nuwefonasezolemu.pdfIn PDF document text
    • http://rjt1.org/upload/files/63769607153.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160899ce9db490---leposu.pdfIn PDF document text
    • http://kimhoatra.com/upload/fckimagesfile/tibinafisu.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/6b291f76d7e1d49893cd59b08be9f020/xewojuwitela.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/0896f7179518c1bd33b1934e8b03e2fb/jerubupalaralujog.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/sf78qapbd2rrh5t18e38b5iiir/8531955244.pdfIn PDF document text
    • http://world-housing.jp/ckfinder/userfiles/files/tovabupipaxa.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/3f077b1d70687eb8c804caf92c32e5dc/simirikisiribugubo.pdfIn PDF document text
    • http://szkolka-wiercioch.pl/files/file/32442990073.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_off0000f689.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF689 17460 bytes
SHA-256: d3bc58a0f8634674df24df5ec30e2158358e3d513e6dc5bcfd930b216832406d
font_01_sfnt_off00012412.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12412 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013c29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C29 10800 bytes
SHA-256: 11d460906025ead68f5a1b3a4a0680009b13d2f4ebce2d87b3542733d610d458