Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e4bc184bfb46d48…

MALICIOUS

PDF

82.4 KB Created: 2021-09-05 23:49:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 30835c24e4c7af039a53056caaf6b9f9 SHA-1: ba72b8d4e4f5f2bd8a9c4c7db8575b87c35d25f6 SHA-256: 9e4bc184bfb46d48dc4d780352fbd57735433884b1d44dc684a6fd9eac42674b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress upload directories and disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fb30f2bf06c---30160441105.pdf In PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a96d6ed8236---16749774210.pdfIn PDF document text
    • http://solyaris.pro/admin/ckfinder/userfiles/files/bafolikajobodudigowugow.pdfIn PDF document text
    • http://strandedtattoo.net/file/49117349363.pdfIn PDF document text
    • https://groupburuemas1.com/contents//files/21628031269.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/ei1k2dsuq16erdfi8bd2m65ur0/26097406121.pdfIn PDF document text
    • https://free-spirit-city.eu/uploads/wysiwyg/files/65854716247.pdfIn PDF document text
    • http://novussiteyonetimi.com/uploads/file/rabowumemivubalirene.pdfIn PDF document text
    • http://bestbelly.org/content/files/files/2471887607.pdfIn PDF document text
    • http://karat-dobremiasto.pl/userfiles/file/rasidazukumubowe.pdfIn PDF document text
    • https://www.oalysa.cz/ckfinder/userfiles/files/jolerilajilamokux.pdfIn PDF document text
    • http://poongdung.com/FileData/ckfinder/files/20210707_1AF90E7DBEACF457.pdfIn PDF document text
    • https://www.idahomedia.com/wp-content/plugins/super-forms/uploads/php/files/de13418a6d64752eb07e187ba4d7b8a0/36853932105.pdfIn PDF document text
    • http://bhk-aindling.com/userfiles/files/texomumawego.pdfIn PDF document text
    • http://gancza.pl/userfiles/file/87938643413.pdfIn PDF document text
    • http://udelimpa.es/ckfinder/userfiles/files/83353553985.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160804512e3b64---8602105750.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/a1949b5ae6b5f685b287f5333e9deefb/soteginube.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160a80df8056a5---temukigezawifima.pdfIn PDF document text
    • http://nature-revive.org/files/file/12378608773.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=hdfc+joining+letter+pdfPDF 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_off0000db86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB86 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f39d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF39D 10588 bytes
SHA-256: 69e3111465ddfca6b7053651f9aaecd8f804ec5db79acc87162e6706ef694978
font_02_sfnt_off00010b93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B93 18568 bytes
SHA-256: aaffb9b576b29a20330ac63f46adcc5bf8e3e7ae7baf173f4a1d8eeb1ad20439