Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b3b9794bd5b9227…

MALICIOUS

PDF

82.2 KB Created: 2021-08-08 09:44:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e279f70289b3a3e8d67b0e9014ddf913 SHA-1: 036cf1d19f415b71343841943f9c3de172c9f6e3 SHA-256: 4b3b9794bd5b922701392fd40af919aa36091f18a20f19a08c681013f64d33d3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains numerous links pointing to various websites, many of which appear to be compromised or disposable hosting. Heuristics indicate this is a link farm designed to direct users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest a phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://ozmutludokum.com/userfiles/file/zudomenuwudisulafixe.pdf In PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/eeed71146599bfac48a273de1fa0f258/nekukulox.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ab4b054ce95---nokiwibukebidal.pdfIn PDF document text
    • https://acrgroup.nl/userfiles/file/babobemakoluk.pdfIn PDF document text
    • http://vakoplus.cz/klienti/devel/sneznerolby.cz/ckfinder/userfiles/files/bigemewi.pdfIn PDF document text
    • https://bluetact.com/locktactyuma/userfiles/file/97960318670.pdfIn PDF document text
    • http://blesk-stroy.ru/userfiles/files/37778686350.pdfIn PDF document text
    • https://digireg.it/upload/fajoveb.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/4f1846ff700b2016cf707bbc5776c619/nelurupuxunu.pdfIn PDF document text
    • http://www.christianhouseshare.com.au/ckfinder/userfiles/files/gufijoxakejirisemarada.pdfIn PDF document text
    • http://dreamcatcherltd.com/userfiles/file/feveno.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608760f8cd34e---37997741500.pdfIn PDF document text
    • https://beautydiction.com/ckfinder/userfiles/files/46819728.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160972d3a470b9---48733529792.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/160f570fe65d4f---62454430592.pdfIn PDF document text
    • http://maility.pl_adresuserfiles/file/38894527121.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec8a23a8e9---magisidanemusitiz.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd85177b1f2---33816983536.pdfIn PDF document text
    • http://newo.ru/files/files/jepuka.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fab35ad16ae---vapij.pdfIn PDF document text
    • http://beergolfers.com/blog/images/file/mitevevekomorolez.pdfIn PDF document text
    • https://bkht.vn/userfiles/file/14297254517.pdfIn PDF document text
    • https://infypos.com/infyposcms/media/90982889747.pdfIn PDF document text
    • http://coutleelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/41470485343.pdfIn PDF document text
    • http://auapp.ch/userfiles/files/sexane.pdfIn PDF document text
    • http://shiraz.sk/ckfinder/userfiles/files/valinefirasevubudamowozuz.pdfIn PDF document text
    • http://augustaelectricalwork.com/editorData/file/74618565069.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=is+there+snow+right+now+in+renoPDF 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_off0000e17c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE17C 10216 bytes
SHA-256: 931a46bda4decdb2de84f3676b506ff38cb22e9d9dfd34964540b37352fe82bd
font_01_sfnt_off0000f86a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF86A 16396 bytes
SHA-256: 0737b194c798eecdeb1fa4d0b92ff22c07c7c5ff14bd667f1b3593207216dbb7
font_02_sfnt_off000122d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1