Malicious PDF — malware analysis report

Static analysis result for SHA-256 605c979a1d24ec9d…

MALICIOUS

PDF

78.3 KB Created: 2021-09-03 22:23:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 747f6439d2423d9dce4062df50accef8 SHA-1: 5704aa1ab22be1c4fe35c9cf63591a05f776584a SHA-256: 605c979a1d24ec9d9403e030f72aad5e01629d227e6393ad2fc29e0bc908c7f2
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The document body was unreadable, but the presence of external URIs and link farm indicators strongly suggests a phishing or SEO poisoning attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://dewalt-naradi.cz/media/upload/editor/file/powurowolorozivinegenorud.pdf In PDF document text
    • http://clubselectionvoyages.com/images/file/93110122169.pdfIn PDF document text
    • http://grafitym.kz/files/file/74953201751.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/prpdegqgk0fga4k4bmued2l9tp/sebesawalix.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160718cba6605f---37318610171.pdfIn PDF document text
    • http://kleinschaden-expert.com/userfiles/file/sanofagumikegowaruzuxa.pdfIn PDF document text
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/160786e56199a0---68296073199.pdfIn PDF document text
    • https://lecachet.fr/docs/files/neseged.pdfIn PDF document text
    • http://ahsaipu.com/v15/Upload/file/2021510112255949.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/tgqcj3s3399p6c26k2lg0lihae/41672681679.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/savaguj.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b06b6ad5c60---98836515657.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/f1023cae51ddb3f4fb9ab3c356d45d64/bazawotogezamamilafutuf.pdfIn PDF document text
    • http://ottotech.center/userfiles/file/2435822948.pdfIn PDF document text
    • http://abpaluso.com/upload/file/27747065640.pdfIn PDF document text
    • http://sporteambiente.it/ckfinder/userfiles/files/wikiveda.pdfIn PDF document text
    • https://tskrea.com/userfiles/file/zapuwaxoxipabifaxaluv.pdfIn PDF document text
    • http://www.halpellet.hu/userfiles/files/37995945620.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/c104681c1739623c6db1947e2f575429/39872847298.pdfIn PDF document text
    • https://cubic.is/userfiles/file/89033050345.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1608b1b4f82497---61222272878.pdfIn PDF document text
    • http://dobraukraina.org/sites/all/sites/dobraukraina.org/files/57328596713.pdfIn PDF document text
    • https://kabelkyaobuv.sk/editor_uploads/files/50095030367.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=hisense+55+4k+roku+tv+manualPDF link annotation
    • 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_off0000ce44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE44 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e656.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE656 17180 bytes
SHA-256: 33849b8139955ca286839f7c2549c950e39549bdf3d94a62f8424ae2a41c32b7
font_02_sfnt_off000112c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112C8 10732 bytes
SHA-256: ac1628f8e486ebf6fef2e0bfa1b1308e2ff9ae8f5e5601a01cac9abcf196589e

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