Malicious PDF — malware analysis report

Static analysis result for SHA-256 08ce0ef0484458c4…

MALICIOUS

PDF

89.0 KB Created: 2021-06-28 09:21:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: a7a2547316991d46931418f14b1b2178 SHA-1: b675775ac0ae26a2447387df040f28c070600133 SHA-256: 08ce0ef0484458c4c38375f0a56f06503c0c32eff9541576e4c75c3a6d35eed2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The file's structure and URL patterns are consistent with a spearphishing attachment used to lure victims to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://laborke.ru/uplcv?utm_term=tom+petty+song+free+falling PDF link annotation
    • http://chiangmai-clean.com/user_img/files/34250962451.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b93d041497---40123256755.pdfIn PDF document text
    • https://evenimentecastel.ro/wp-content/plugins/super-forms/uploads/php/files/ha6gef261cov6bclpc98bbrkrm/kegen.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/5092375409.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b3b92d5dc74---51862382362.pdfIn PDF document text
    • http://grandp.ru/userfiles/file/jagoxar.pdfIn PDF document text
    • http://wittlich-luexem.de/userfiles/file/52607186052.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b5bb2cdfe31---dewusipez.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a758c1ce96e---50912719995.pdfIn PDF document text
    • http://dkmmotor.com/files/userfiles/file/98407969827.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b139aa003c0---zoroxozafezafuwozina.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/16a51596a174f79bbda6f3606239b37b/wuwanatudapipoziw.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c32e8f0326e---xuzuwovurokijogevigafe.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/160b66f68de330---jodarabanalawudaretoloj.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c49ec7eb76e---sodupavapezemilok.pdfIn PDF document text
    • http://drivingschool-brno.eu/files/63439376382.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607390375559c---85980225221.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/1609d2968404ff---70567106154.pdfIn PDF document text
    • https://theelementrama9.com/userfiles/files/gakavojiwa.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/t7tk8ecih1fil5tu6eesqu31ar/40882517247.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/62e4e980de18c31b3d85ec994da10d27/fixedekopabudifikutu.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16087b6d61246b---vakimazoxavukib.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/32973212560.pdfIn PDF document text
    • http://davidlbrooks.com/clients/868292/File/mibamejeduzunobe.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/9ddb275aad98340f6694287429b26c7d/jodilebiwigadera.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_off0000f7fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7FC 17748 bytes
SHA-256: 5b5aa9bd44d3d57b685fa19c1eefcf1e4933d6b7b9e7a40c9fdf67f7a28a700e
font_01_sfnt_off00012614.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12614 10776 bytes
SHA-256: d8d6f308b29fee3c52c92a7edebce0bc7cbc44d1e17ea3301236a67b30256b76
font_02_sfnt_off00013eea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EEA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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