Malicious PDF — malware analysis report

Static analysis result for SHA-256 907ef06e8ef0dd79…

MALICIOUS

PDF

113.3 KB Created: 2021-07-02 17:28:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ac7b0e8f5afb495c5079c887525fa84e SHA-1: 38d4eca86576c5b28e5a2e9728654370f7bf0df6 SHA-256: 907ef06e8ef0dd794d25a89fba76eb0f1e7076d1faecb626fc7ed1f480711446
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains a large number of embedded URLs, many of which point to compromised WordPress upload directories and other potentially disposable hosting. These links likely serve as a link farm to direct users to malicious sites, a common tactic for phishing or malware distribution.

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 http://barnesfamilyconnection.com/clients/f/f3/f37d50667a1bb99e511e26172889fab9/File/84316373645.pdf In PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088b35d0fef3---fawaziw.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1608fbbba02bd0---larugedet.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607169d2ca08e.pdfIn PDF document text
    • http://strategie-online.net/catalogue_dynamique/file/nupukobusakawase.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/ujvje8t8jnbqm496fldhfv83r5/pefojelagasozu.pdfIn PDF document text
    • http://gadkowski.pl/repository/filemanager/file/mupeferuvisa.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/41adef93546ca2125e67613a9d44a164/30559152454.pdfIn PDF document text
    • http://flatadministration.com/uploades/fckeditorfile/pufidefosotaloza.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/5e6b2f0e595b3cc3cf4f83a10d4f12d8/90781434209.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/f7159c1282fa017d052a98d6426239dd/49308752353.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/ea9fcf150522548054694da623902c67/60447729950.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/8gnfsbi1hplp0nhe46565d7qj1/xozibesosa.pdfIn PDF document text
    • https://cakenflowersonline.com/userfiles/file/90177495434.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16077e2921fd99---xarepo.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/9ce12493b65c64c0f5cb443738fb35ba/dases.pdfIn PDF document text
    • http://yilip.net/userData/board/file/bovezax.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a69ca7b8eb9---60466285666.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/dd5d8d8c440a2593bfa17f2e3e93243a/futatirovelot.pdfIn PDF document text
    • https://mannerfeltdesignteam.se/ckfinder/userfiles/files/51045995815.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/0c754e609c693c809de71e4fafcbb6f9/kotikatidasevuvebabexifoz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=endolymphatic+hydrops+meaningPDF 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_off000152c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00016ade.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16ADE 11056 bytes
SHA-256: e8409b228115ca1ea07c92a4f2a0d829d266d1e9b3d10e22ad1e2af7f873a334
font_02_sfnt_off00018433.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18433 19468 bytes
SHA-256: b7a55b33e0defe702e13973eb62a9547802eb9731c7a77ee32bbc529785f7a6a

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