Malicious PDF — malware analysis report

Static analysis result for SHA-256 597731f190f8b268…

MALICIOUS

PDF

86.8 KB Created: 2021-07-14 00:08:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 6981cdfec8d85b759dcbc0135ebb30ab SHA-1: 2ff83466bb2187b071b93ff0a099d04cae412328 SHA-256: 597731f190f8b26822905784102cc54d1428e7c8ebe89b28ecdfb71f821c9f5d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The heuristics identify it as a link farm hosted on compromised WordPress sites and disposable domains, likely serving as a lure for phishing or malware distribution. Although no scripts were extracted, the presence of numerous external URIs suggests the document's primary function is to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://krisoc.ru/uplcv?utm_term=fluid+therapy+in+icu PDF link annotation
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/0b6dd2dbe26667d7b11e6f2867503cdd/tadeworekazokuwi.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/16081d073ed2e3---xefomuponokeb.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/91888317892.pdfIn PDF document text
    • https://soosekszer.hu/upload/files/gimizedodokul.pdfIn PDF document text
    • http://health-bridge.in/upload/file/jemez.pdfIn PDF document text
    • http://hesexpo.com/img/editor/image/file/vopavido.pdfIn PDF document text
    • http://logiccpacma.com/ckfinder/userfiles/files/seketasepibomu.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/35ffdc2867ed19e1107bea24c540a9c1/97846489460.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a1d8a6a3739---fitavidaxewexoxifozijival.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/v8ps99m8qrk40heoi9vm5mmcms/47498748485.pdfIn PDF document text
    • http://struttur-arch.it/userfiles/files/naxuvozenirikimazusu.pdfIn PDF document text
    • https://sport-jicin.cz/dokumenty/buzorofixozozugim.pdfIn PDF document text
    • https://unicornproduction.gr/wp-content/plugins/super-forms/uploads/php/files/6a589242b69f77e31a0031dda511364f/12961022035.pdfIn PDF document text
    • https://nestaerospace.com/uploads/file/68540167831.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160861b22436ae---68718085008.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/5g1t4p2p2oln8qk45ku6id73i9/79967723810.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc23febd9a---21615863692.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/93dfa462199d8178cf4870bfea97d872/55902213875.pdfIn PDF document text
    • https://pasarantogelsatu.com/contents//files/mufitenufo.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609fec00e9e57---diwenodupe.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/h2a8mnkrnvkn2778m45q66qdl0/basonuvojuxinurew.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/b3c1273bc8d9f6d6842bd2072650a223/daxigopi.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160dab0dde2b3a---dezobubemaxobunis.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/160abf6b5aecb2---taripajej.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_off0000f270.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF270 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010a87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A87 10516 bytes
SHA-256: 93765a5612585ed3984fd50171c2b90a2a2493f077f4df0d9602105befe26bad
font_02_sfnt_off0001225b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1225B 16836 bytes
SHA-256: 9953898dec798f4ed313a3570e9a8e21bf83a2b28e085ee3e779e569a696acc1

Open this report in the interactive analyzer, or submit your own file for analysis.