Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a91dea0d85fab0b…

MALICIOUS

PDF

115.0 KB Created: 2021-08-05 12:02:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 910cdfcecc1d281dd98520607fb855ad SHA-1: 23fcd563b76592eb780d3822edfcc8fc1892751d SHA-256: 7a91dea0d85fab0b28adf4f35662071782d9a8a6eac41e4ac56bacdc51881e67
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and link farms pointing to compromised WordPress upload directories and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious redirection chain, likely employing JavaScript for obfuscation or execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crysiq.ru/uplcv?utm_term=pirates+of+the+caribbean+2+in+tamil+full+movie+download+isaimini PDF link annotation
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/3768b6e1c6742ad3164e05fc02750030/jamewilegobidaz.pdfIn PDF document text
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/8da5b3ead7863a5075293d78c09ad1a0/gesufawa.pdfIn PDF document text
    • https://xistenze.com/files/files/rafowuvavuniv.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607812465e968---betonolodito.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1608e1d7a32944---jubinigavakebo.pdfIn PDF document text
    • http://nesemlak.com/test/images/uploads/files/jowigi.pdfIn PDF document text
    • http://daehwa.info/uploaded/file/rodanufu.pdfIn PDF document text
    • http://tomaszfilipczak.pl/userfiles/file/26534611319.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608509b4b679e---19843477038.pdfIn PDF document text
    • https://vayamcs.com/content_files/files/33938846731.pdfIn PDF document text
    • http://tantex.org/tantex/tantexuserfiles/file/6340055467.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/0716af47f39a887daa4c5951f9ce1156/puxufaxutujumu.pdfIn PDF document text
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/d5ebf6d3cffaa0a41a48158962c677ae/mudakonewisifofajop.pdfIn PDF document text
    • https://www.bistro-e.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb472ca33c---toxipefesegerulukopuse.pdfIn PDF document text
    • http://kristenpell.com/userfiles/files/giwujef.pdfIn PDF document text
    • http://beming.com/ressource/site-image/files/96976213011.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c704ba27b83---webolidemu.pdfIn PDF document text
    • http://influences-vegetales.eu/assets/Image//files/91754065007.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608de21e6296b---34980815320.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1610690a410bb5---vubozimalo.pdfIn PDF document text
    • https://quangcaowebsite.vn/uploads/files/44039541466.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607afeba32390---63202700835.pdfIn PDF document text
    • http://4yoga.by/pics/files/vuvodevadakosuputog.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/farumiwizino.pdfIn PDF document text
    • http://kingalbertltd.com/uploadedfiles/file/diwekobifo.pdfIn PDF document text
    • https://www.delaneyllc.com/ckfinder/userfiles/files/13550235054.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_off00015aa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15AA5 18532 bytes
SHA-256: 225bd19cbcb7e4fdb06149300730d95e17b4f5f254d541bf12f3873c09b1a386
font_01_sfnt_off00018b36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18B36 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001a34d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A34D 11256 bytes
SHA-256: 90c47e65fea3e7ebf53f69a7b585db6ad566508a731d32bd415fad540ad2a8d7

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