Malicious PDF — malware analysis report

Static analysis result for SHA-256 a09c54930ea108eb…

MALICIOUS

PDF

75.9 KB Created: 2021-07-04 02:01:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: a3ca5b1ea3974b70a89fd0ad86404150 SHA-1: de4b6ae6866dd8b1aa0b5374d4173cd64a5addd2 SHA-256: a09c54930ea108eb015a45b3c1c5d43cc8153e2583b3b6d2dc212c93a1ffd2b5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs and link farms hosted on compromised CMS platforms, suggesting an attempt to redirect users to malicious or phishing sites. No scripts were extracted, but the structure and URL patterns are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://huntic.ru/uplcv?utm_term=domain+of+root+function PDF link annotation
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/d10992050299e95dcdd4448cb36883ae/nujopuxowebumusebos.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607756b48b6ea---sotimibetudesemagak.pdfIn PDF document text
    • http://gwhs79.com/clients/867100/File/2432271845.pdfIn PDF document text
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/f108f7df4858395dfb73918d29de666b/86391695144.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094c83e1a3e2---mapexajanud.pdfIn PDF document text
    • https://gamasteel.net/userfiles/file/88769790487.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc9357797e---29991309969.pdfIn PDF document text
    • http://frezerovka.by/images/fxeditor/file/70950267895.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607da5f7e3dc0---gigixulis.pdfIn PDF document text
    • http://bluekeydigital.com/images/pic/file/xolinoregodebi.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16097e841d8e3d---zumubogikovurisesesoter.pdfIn PDF document text
    • http://holzbau-napetschnig.at/46239206224.pdfIn PDF document text
    • http://hutbephottaihaiphong24h.com/upload/files/35734413158.pdfIn PDF document text
    • https://easypayindia.in/userfiles/file/46094719897.pdfIn PDF document text
    • http://lowndes85.com/clients/d/d3/d39312ffd46aa2fbcc4e4de04d96a17f/File/10886331201.pdfIn PDF document text
    • http://breakevenpoint.pl/uploads/editor/file/lariguvu.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094d77a9da71---xobireg.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/7ff93ffe7c72e0707f4b93424ffc29a0/kobixakisirixuboguvelami.pdfIn PDF document text
    • https://alice-immo.com/userfiles/file/saviwiririnuk.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/c55c210481c93e5fc71f9b6523004502/94438320768.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/c5aevb5r4k1qahkavcg0iaj3l5/jozibozisaxojakodujimujo.pdfIn PDF document text
    • http://kancelaria-perfect.pl/app/webroot/media/files/molidokokipek.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c98cad412c---filokiwazisokova.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///wanawovutobu.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/9d2a61f5b606c79df2e908e88a35f7af/xutavopogov.pdfIn PDF document text
    • http://divorce-difficile.fr/userfiles/file/likusavanuwaxo.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_off0000c638.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC638 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000de4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE4F 10252 bytes
SHA-256: 5180e6f51e784c47522a32223975dc4e2b9d6ac256ad75359e076afff233380a
font_02_sfnt_off0000f54e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF54E 17088 bytes
SHA-256: 2a6d8f7229c45ab094ffb2bb41fd7751879335100cfc936834acf056c570546b

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