Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3bf4469e2d77bb6…

MALICIOUS

PDF

115.2 KB Created: 2021-09-04 14:58:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: b42c620b6f285127ffc248cc8567e290 SHA-1: 23741cf3e90f55262bd21fdbcda2cd34d108da5c SHA-256: d3bf4469e2d77bb60d5636c43573d0bbf6a0d145c71f4335b40edaad8f8e8d7a
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, presenting numerous URLs that likely lead to phishing pages or malware downloads. The presence of multiple compromised CMS upload links and disposable hosting further supports its role in distributing malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://medvor.ru/uplcv?utm_term=verbarama+passe+compose+pdf PDF link annotation
    • http://scamps.biz/userfiles/file/sumegu.pdfIn PDF document text
    • http://nextgt.eu/uploads/file/nunijivuxexo.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cade4dad334---xetitazel.pdfIn PDF document text
    • http://gpkoaee.ru/ckfinder/userfiles/files/59971658023.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c55d8501437---bujovowodikemipunedovat.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/mhr075nq85js3k2oedlcco8uc4/sumawizisitora.pdfIn PDF document text
    • http://qianlong99.org/ckfinder/userfiles/files/vozugufivimizezenezu.pdfIn PDF document text
    • http://dzbnf.com/upload/file///20788746956.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071031a2f972---41669200116.pdfIn PDF document text
    • http://kssi.ir/public/userfiles/file/waxirusem.pdfIn PDF document text
    • http://studioboscono.it/userfiles/files/77714474265.pdfIn PDF document text
    • http://homenet-spb.ru/userfiles/file/bofazejozosawututukuvopa.pdfIn PDF document text
    • http://mytaylormadefamilyusa.com/clients/864113/File/35918945055.pdfIn PDF document text
    • http://lor-rostov.su/userfiles/files/jasonemikutonuguxubuguwaw.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/lbjq01t4ofhekgg73ckpj8nmj4/labojuzebezuju.pdfIn PDF document text
    • https://tonmathunglan.vn/upload/files/74138878877.pdfIn PDF document text
    • https://fengshan-zhennangong.org/upload/ckfinder/files/zavafako.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/uvrhtpr26t9v11b26opt7cd2e2/vorizawosutogawuge.pdfIn PDF document text
    • http://sicompk.com/survey/userfiles/files/37550441963.pdfIn PDF document text
    • https://tecnibat.net/uploads/archivos/rezoxadi.pdfIn PDF document text
    • http://omgmediatank.com/userfiles/files/kuxuguwupudijeje.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16084b5769e390---67744982640.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_off000155fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x155FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00016e0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16E0E 22124 bytes
SHA-256: c42b8c0ea5367ff8d0b38631bf139ff8ba05d12f29f4d29dce4d9baff563b940
font_02_sfnt_off0001a731.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A731 10552 bytes
SHA-256: 6ccb3b4f07856c89494c020c82e02334716bf10b9c2b921b5deffe35d079c7c7

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