Malicious PDF — malware analysis report

Static analysis result for SHA-256 da3a80ba938edd60…

MALICIOUS

PDF

76.0 KB Created: 2021-06-30 16:29:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 9ff11d9319c65986d498518e106dc5d6 SHA-1: edae282c2d61646cee9183fe67bcd45a77b911df SHA-256: da3a80ba938edd60417d410864e7bb0ac319be5ddb7cef3b8b1141c910922e1d
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised or disposable hosting, suggesting an attempt to lure users to malicious sites. The document body is heavily obfuscated, preventing a clear understanding of its specific content, but the overall structure and URL analysis strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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 http://niezapominajkowo.eu/userfiles/file/xasoledesewimafakekefirig.pdf In PDF document text
    • http://flexicourse.cz/res/file/gupatawonesukipilaxavo.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8c9c1167a2---fasejuvuve.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/964ed620fbad9fafd694c0875dd22161/87544813893.pdfIn PDF document text
    • http://nakatka.com/files/file/zuwipopixiratotabufado.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/3i7vbkn00v0q1k4jpcm9gjvhi7/midavuwa.pdfIn PDF document text
    • http://alpha-cp.com/userfiles/file/10980557701.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d36dc7fd65---24506431992.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160c72533b58c6---81109069301.pdfIn PDF document text
    • https://walkandsmile.com/userfiles/file/23074444025.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/p322emusdv0t3t4vt5l8d4a231/budetonawoxinob.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/aa4816803dcbbd977c9162284aba8d6a/xugufaserirule.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/c684fa962d3bf57b039f011e585f2ed5/51096230167.pdfIn PDF document text
    • http://domeinbeverdonk.be/assets/files/file/64690249737.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/e3jngjiusql28pdj6jtjr4kvl6/vizuwukimokekixej.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/073768c3abec8c20296515681e123a8b/33997370185.pdfIn PDF document text
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/348a349be5a57107d5d1bb63458dcc3c/pikujalinugofebakovo.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b72932cb7ae---jezojap.pdfIn PDF document text
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/4fc7d991cba40cf867a30491967c5c3f/52339751171.pdfIn PDF document text
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/03168bc6da4aa5d6b14bedd7a79d943a/tenegutuvapu.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/05ea5becba4aa4e8568b782eaa5b55a2/mivudazojelo.pdfIn PDF document text
    • http://cnzgks.com/userfiles/file///rabisudoxufokemuvunug.pdfIn PDF document text
    • http://daotaonhaccong.com/uploads/userfiles/file/99716589906.pdfIn PDF document text
    • https://lacecinella.com/writable/public/userfiles/file/fokafefutut.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/f9c7b726b177a0ea91de1bb570f723ad/23751782067.pdfIn PDF document text
    • https://dgaspcsm.ro/ckfinder/userfiles/files/jivivapilomopawolupop.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=yle+starters+worksheetsPDF 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_off0000c751.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC751 16896 bytes
SHA-256: 2eaddfa58cb33bed7d10a7a36887b7364feccb6f3541d7bee6398434d16493ad
font_01_sfnt_off0000f374.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF374 10168 bytes
SHA-256: 9456d5602d17508177b2eac3b8f23cc170b4da8bb5c592b5faf464c56768d0bd
font_02_sfnt_off00010a7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A7B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1