Malicious PDF — malware analysis report

Static analysis result for SHA-256 6373bf2a5a4b6d20…

MALICIOUS

PDF

86.8 KB Created: 2021-08-15 00:45:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: f005fac4205bd68a980abd96094969dd SHA-1: 2297d8bff1f7b0d31831e38e5ed0e1e21052d1ce SHA-256: 6373bf2a5a4b6d20d48bfe5668ae4df48a4ea5ae8d78d709df22db6f3a8b9b7d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and numerous external URLs, many of which are part of a link farm hosted on potentially compromised or disposable domains. The embedded JavaScript and the nature of the URLs suggest an attempt to redirect the user to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://nomylo.ru/uplcv?utm_term=verbos+regulares+e+irregulares+en+ingles+y+espa%C3%B1ol+en+presente+y+pasado+pdf PDF link annotation
    • http://personnelstrategies.net/userfiles/file/8993795491.pdfIn PDF document text
    • http://canoeing.by/pics/files/nexulajusefizozideno.pdfIn PDF document text
    • http://jonme.net/ckupload/files/biluwagilasikemusu.pdfIn PDF document text
    • https://projectmine.hu/ckfinder/userfiles/files/siweza.pdfIn PDF document text
    • https://sport-jicin.cz/dokumenty/pirove.pdfIn PDF document text
    • https://kompaspt1.com/contents//files/43422762635.pdfIn PDF document text
    • http://artospace.com/pics/file/50200780875.pdfIn PDF document text
    • http://luxcottage.ru/stroykamen/userfiles/file/87625510981.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af8a235f3c6---buzaxifirarobefewiwulup.pdfIn PDF document text
    • https://neksav.com/upload/ckfinder/files/49732249296.pdfIn PDF document text
    • https://verlauf-ekb.ru/admin/ckfinder/userfiles/files/96089474521.pdfIn PDF document text
    • http://kwartetproforma.com/userfiles/file/xonowugudal.pdfIn PDF document text
    • https://aquarell.ro/userfiles/file/2312357326.pdfIn PDF document text
    • http://diagnosticaedilizia.com/userfiles/files/razefuvobepituxo.pdfIn PDF document text
    • https://empezo.xyz/js/ckfinder/userfiles/files/fuxijudisetorivegasifa.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/m1ksj3l4ui6jh18irk1blq6i60/75210127321.pdfIn PDF document text
    • https://0900107678.com/upload/file/90335090429.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d92ab016ed5---xadugabo.pdfIn PDF document text
    • http://wellfoto.cz/pictures/files/97252787027.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/fd14bc6db515fd69dfda6039c5e08386/64102155275.pdfIn PDF document text
    • http://vetcasatenovo.it/userfiles/files/92028080109.pdfIn PDF document text
    • http://dostavkaturov.ru/files/file/duvujinefozegevixi.pdfIn PDF document text
    • https://helicopterleasingservices.com/userfiles/files/56923808855.pdfIn PDF document text
    • http://farmaciafoglia.eu/userfiles/files/gagikilulugux.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_off0000ea62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA62 11204 bytes
SHA-256: 04ce0f1e47e61535940ba73dbe9d530e8a7ed0997be95539584453e6075d0abd
font_01_sfnt_off0001041f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1041F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C31 17404 bytes
SHA-256: d90032f5d79e759b16cf073aa89e79af4d4d6cc96e21636c19832759a4c5189e

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