Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a9e93e39b484d40…

MALICIOUS

PDF

81.5 KB Created: 2021-09-04 08:47:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d1857492ecc598563e0d6a1d6bb79b96 SHA-1: ebbc7e0e8ce84feafb20129cc7c98882d406aa74 SHA-256: 0a9e93e39b484d4058e2ba71876f970e3ad36cfd26a06aae4df907578fe1b9f4
156 Risk Score

Malware Insights

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

This PDF was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting. These links likely lead to further malicious content or phishing pages, serving as a distribution mechanism for malware or scams.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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.
  • 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://ketchas.ru/uplcv?utm_term=comparative+and+superlative+board+game+pdf PDF link annotation
    • http://nhadep30giay.com/uploads/image/files/wijowegamet.pdfIn PDF document text
    • https://renebeumer.nl/userfiles/file/renotadazezirenomelemas.pdfIn PDF document text
    • https://copperscraphandlers.com/ckfinder/userfiles/files/saxunuvize.pdfIn PDF document text
    • https://genesislighting.net/wp-content/plugins/super-forms/uploads/php/files/425a6b21a6cf5cc785ed10ec4d0d2a06/zoxapirabifukuseri.pdfIn PDF document text
    • https://hanomanberjaya.com/contents//files/tozipejafuvo.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/16076cefb1ca61---kolitezaxoxedojivew.pdfIn PDF document text
    • https://viessmannboilers.ca/fck_upload/file/birolalaret.pdfIn PDF document text
    • https://luminex.pl/upload/file/zaxifesaxoku.pdfIn PDF document text
    • https://aksukartela.com/images_upload/files/zesomirafiwufazow.pdfIn PDF document text
    • https://bmat.mn/uploads/ckfinder/files/89584828695.pdfIn PDF document text
    • http://bet-balance.com/userfiles/file/81605950116.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/4f9c21a81c61ed3ca6dd31652bac7c13/viraxokituxegod.pdfIn PDF document text
    • http://gesht.ru/admin/ckfinder/userfiles/files/88556893844.pdfIn PDF document text
    • http://amy-tsai.com/images_express/userfiles/files/zirapip.pdfIn PDF document text
    • http://mosjob.ru/images/file/gejagiwopur.pdfIn PDF document text
    • http://timebank.ru/sites/default/files/photos/pagefile/20493102469.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/jixowejelesimix.pdfIn PDF document text
    • http://ridendo.cz/files/file/dilelosazuveraxixonuzuvo.pdfIn PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/r1ffra1090aahu6ofkrq21o2h1/paxosozuseduje.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071d28abe91f---53819340944.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1611270188351c---fopupam.pdfIn PDF document text
    • https://4cmedica.com/ficheiros_upload/file/38451602598.pdfIn PDF document text
    • https://darkoyunpin.com/calisma2/files/uploads/zoxawul.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_off0000d82f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD82F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f041.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF041 17928 bytes
SHA-256: 0c99b05ba36dec313ab8eba0599ea73aae3aea0454a79e6e5f206212b4744722
font_02_sfnt_off00011e62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E62 11180 bytes
SHA-256: 7a5ac6bcbab1958637ec12901aaba753d9965f009591c947f8d97bc1a8e00a80

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