Malicious PDF — malware analysis report

Static analysis result for SHA-256 333592d322f71a12…

MALICIOUS

PDF

78.9 KB Created: 2021-09-21 06:45:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: d6d26d55ea0593b73302026fe1f6b930 SHA-1: 68ec6c75c2f323befa2d0361f71a4ccea2d3320b SHA-256: 333592d322f71a12e7c64524c316d7c5cad3bac50d95d1b0ffa4bc35e97b31ba
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to PDF files hosted on various domains, some of which appear to be compromised CMS upload storage. The document body is heavily obfuscated, preventing a clear understanding of its direct user-facing content, but the overall structure suggests an attempt to lure users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 http://oipipleszno.pl/userfiles/file/nekarimiwu.pdf In PDF document text
    • http://tznjl.com/userfiles/files/58858680744.pdfIn PDF document text
    • http://beijingteye.com/upload/files/35600320974.pdfIn PDF document text
    • https://subded.org/userfiles/file/52041342951.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/70cfc722cbc6226423527c4a90c96bb8/jeravinewatefozo.pdfIn PDF document text
    • https://austarpharma.com/upload/files/natirikupowegetuluzu.pdfIn PDF document text
    • https://rugsdirect4u.com/uploadedfiles/file/bopigudosobapetorobubip.pdfIn PDF document text
    • http://kuehllawpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tomumasezekufojadigojomu.pdfIn PDF document text
    • http://tlumacz-bialystok.pl/pliki/file/badaxatalokeruguzulekon.pdfIn PDF document text
    • https://mebelihome.ru/upload_picture/2025968865.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612ffa831fb95---kolovarexe.pdfIn PDF document text
    • https://eslms.com/userfiles/file/jaminenevogazive.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/161365175020c4---zugedivukonopivuvevojumi.pdfIn PDF document text
    • https://www.corpeverest.com/ckfinder/userfiles/files/tasekaxawegofotekevuli.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/02038639ebc97d779f739b7c7ac016da/rexegutorumenetufaf.pdfIn PDF document text
    • http://saraswatishikshamandir.com/singhania/downloads/file/senomuperafikijenitozuna.pdfIn PDF document text
    • http://abbuffalowings.com/uploads/files/tenemabobasagejezum.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138681d01b52---rujapidoribexomot.pdfIn PDF document text
    • https://budapestpainter.hu/ckfinder/userfiles/files/49411816945.pdfIn PDF document text
    • http://autoneza.cz/UserFiles/File/juxovuluretituxe.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/161441108786f1---80705506320.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/161428a94c7a4c---mafijividimuzepul.pdfIn PDF document text
    • http://teakdeck.pl/files/file/padunonejotiluren.pdfIn PDF document text
    • http://elencostruzioni.it/userfiles/files/35780808366.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613fc74e74fda---51648562516.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=klwp+live+wallpaperPDF 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_off0000d244.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD244 17676 bytes
SHA-256: f90450009d5a5c69734c8560574b5523c9b976fd2dc34a55f35e8fde28cf7fe5
font_01_sfnt_off0001009f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1009F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000118b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118B5 9896 bytes
SHA-256: def2098177959eac5d45af0be6cb451805a32c61889d92edf3f27d0ea3b9b978

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