Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fac0c05f27ced4a…

MALICIOUS

PDF

78.7 KB Created: 2021-09-12 08:55:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: beb3187b8a490f0aa2d6ae74de08c8d2 SHA-1: 1a44764370eb4e8b6b4e21f835f0dd6ec0d0fa04 SHA-256: 1fac0c05f27ced4ac4ad343f94537d29a4f1197d5f78aa05daaff578f8b18775
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and link farm heuristics, indicating an attempt to redirect users to malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, potentially leveraging embedded JavaScript for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://inwebjor.ru/uplcv?utm_term=free+rust+steam+key+generator PDF link annotation
    • https://orderpoet.com/ckfinder/userfiles/files/67235007244.pdfIn PDF document text
    • https://igruppe.no/ckfinder/userfiles/files/tolabimorukirewuvasowumi.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612f8ade62a98---juvixonatimeza.pdfIn PDF document text
    • http://icltindia.in/userfiles/file/31053509400.pdfIn PDF document text
    • http://runhouchem.com/upload/files/86359559206.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/23711307e04401f1fa512851221a458e/52393311673.pdfIn PDF document text
    • http://goldsunjsc.com/upload/files/82445402124.pdfIn PDF document text
    • https://indicaperu.com/userfiles/file/fegovikiginuzuk.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16130429a7e532---9651227686.pdfIn PDF document text
    • http://kryotherapie.net/neu/userfiles/file/44037524414.pdfIn PDF document text
    • http://highdesertrent.com/newsite/images/uploads/file/solomuxuwekudiwuzinel.pdfIn PDF document text
    • https://villatoscana-pi.it/userfiles/file/xamepupujonezu.pdfIn PDF document text
    • http://cautrucpalang.vn/webroot/img/files/tovigafozixufajiwuzuburi.pdfIn PDF document text
    • http://gartenbaukoeln.de/uploads/files/97217959823.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135888c87360---44740887999.pdfIn PDF document text
    • https://nabijdefossa.nl/upload/files/tuzarejulazuj.pdfIn PDF document text
    • http://csc0898.com/userfiles/file/20210909062017_c774j1.pdfIn PDF document text
    • http://yds-wcv.jp/free_images/files/37851958774.pdfIn PDF document text
    • http://farmaciafasolis.eu/userfiles/files/56719134066.pdfIn PDF document text
    • https://himalayanwanderer.com/himalayan/userfiles/files/sizagotutilimebilo.pdfIn PDF document text
    • http://thegioixedap.net/upload/files/wataninenis.pdfIn PDF document text
    • http://gyermekhaz.hu/Content/site_images/files/sabufexexakemi.pdfIn PDF document text
    • http://miskolciharsona.hu/pictures/file/94540647717.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_off0000ce35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE35 18048 bytes
SHA-256: c4c95791bf90e81bed050178f8018661634bb1456672453296216d2052343a95
font_01_sfnt_off0000fcdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCDF 10596 bytes
SHA-256: 1984ffb173899d7a141c64bbcfcdded72d7b2fba67d75f1aa262cb569900671e
font_02_sfnt_off00011530.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11530 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1