Malicious PDF — malware analysis report

Static analysis result for SHA-256 c044aaaf0b51fe4c…

MALICIOUS

PDF

81.6 KB Created: 2021-09-07 17:21:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4d0fd295eaaa40b84f0dbcde60618a17 SHA-1: ca3368c79488e9d08b89d3702e46f435b0cf3bc5 SHA-256: c044aaaf0b51fe4cfe49fb703d5ec034cd603834bc6e02d9cf832e1a9f1364e2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It functions as a link farm, containing numerous URLs that point to compromised WordPress sites, likely serving as a distribution point for further malicious content. The PDF itself does not contain readable content, but its structure and embedded URLs strongly suggest a malicious intent to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://ketchas.ru/uplcv?utm_term=hot+mix+asphalt+design+pdf PDF link annotation
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/7b45apbo2ko8lkdm465ijp3nql/tafaxo.pdfIn PDF document text
    • http://sitepride.com/clients/c/c8/c8c605999f3d8352d7bb792cf3fdb25b/File/1610698440.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/9a77etbmeh914ol733vt1llj4c/niliwefogevobotuviworedig.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f50cdc6004a---1571728563.pdfIn PDF document text
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/4k2ao2hlojj9m9485hphlvksmn/ledegabapozuwako.pdfIn PDF document text
    • http://mobilni-kadernictvi.cz/files/file/59704899590.pdfIn PDF document text
    • http://xz-brand.com/ckfinder/userfiles/files/vemozejopup.pdfIn PDF document text
    • https://promaxsuspension.com/csmimage/file/67701111966.pdfIn PDF document text
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf51c77ed7---bevosivifevobe.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083262490496---wuwub.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16071621aa2e3e---tiludedabi.pdfIn PDF document text
    • https://acgroupenterprise.com/userfiles/file/bukinubovanufakofel.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16100fe352507a---41946939456.pdfIn PDF document text
    • http://samrayburnclassof1980reunion.com/clients/873185/File/ruzutetiwexopejifege.pdfIn PDF document text
    • https://sunsoftinfoway.net/ckfinder/userfiles/files/86305315502.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/futometexozenitotupamex.pdfIn PDF document text
    • https://hzautomatisering.nl/userfiles/file/84969661811.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/11710625475.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c88f3dbace---marawuxavumarelem.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/k2hsmludtn5ef12bna0rtlshvc/vufututovikexutovodegelo.pdfIn PDF document text
    • https://kawanmto.com/contents/files/84198953093.pdfIn PDF document text
    • http://hunting.kg/userfiles/file/96885121637.pdfIn PDF document text
    • http://ambulanceservice.pl/userfiles/file/rozijisalile.pdfIn PDF document text
    • https://serwisnawigacji.pl/userfiles/file/89238647793.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_off0000d98b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD98B 10940 bytes
SHA-256: 287db85ce05860da193b2e9658f1c5b572b23106b33418e223419dd288b5cba9
font_01_sfnt_off0000f276.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF276 18000 bytes
SHA-256: 1af045598551a08cd1712139a92f565f9cef5b61af07bb12216cc47ab5c2ca79
font_02_sfnt_off000120ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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