Malicious PDF — malware analysis report

Static analysis result for SHA-256 332a9b23ad7d1543…

MALICIOUS

PDF

92.5 KB Created: 2021-09-15 06:27:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 441ec8f1ce25f771d5b5ebe03f3cc401 SHA-1: 466951390d60026c87c9d304605de02085fd0e59 SHA-256: 332a9b23ad7d15432918a0332540b3f7025b2a78ee8c6503a0f977cbdce245e5
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using small PDFs for link farming on disposable hosting, and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' suggests links to compromised WordPress upload storage. The embedded URLs likely serve to redirect users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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=after+2+full+movie+online PDF link annotation
    • http://bursaceyizgelinlik.com/images_upload/files/sizekuxofadili.pdfIn PDF document text
    • http://donghozibistore.com/luutru/files/55818511249.pdfIn PDF document text
    • http://ledseoul.com/userData/board/file/wowelikukubosipude.pdfIn PDF document text
    • https://efficimm.fr/userfiles/files/23631321438.pdfIn PDF document text
    • http://deborahkay.com/ckfinder/userfiles/files/87322213722.pdfIn PDF document text
    • https://tefen67.com/userfiles/files/73659382364.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/3looem1lhgnhiirf4tcv48v4t9/bokezitenugizuzeju.pdfIn PDF document text
    • http://oawebserver.com/piceditor/file/febezixufapetazatu.pdfIn PDF document text
    • https://generalaudit.pl/eurostyl/photos/file/31562701649.pdfIn PDF document text
    • http://dentalweek.eu/userfiles/files/42766556917.pdfIn PDF document text
    • https://doina.md/fckeditorfiles/file/puvesulo.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/161415e6743860---gidefivijubevumura.pdfIn PDF document text
    • http://monarchiaerembolt.hu/tmp/raxivowasutinafujej.pdfIn PDF document text
    • http://www.ctmmaximoravenna.com/ckfinder/userfiles/files/taxifitabarew.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130521fad3fd---guradiderefuvipiriravaz.pdfIn PDF document text
    • https://birotex.rs/images/files/84345630999.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/683aeca600a018a870e046cf204f2286/76236803294.pdfIn PDF document text
    • http://bajcsidavidfoto.com/_user/file/18179390207.pdfIn PDF document text
    • http://le-bouquet.be/userfiles/files/ximiponanapux.pdfIn PDF document text
    • https://n-vv.dk/userfiles/file/lozometiketulabus.pdfIn PDF document text
    • http://www.examnotice.in/uploads/files/lezakizireliloliro.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/kkulhhsu6e51ao68tl0lib0i76/jodetewetubufurufopogukug.pdfIn PDF document text
    • https://www.orthovision-lublin.pl/ckfinder/userfiles/files/vasusitikifowunip.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1613ba1b42fab4---nusoximuxijaridul.pdfIn PDF document text
    • http://top-rubber.com/admin/fckeditor/editor/filemanager/connectors/upload/file/59078108276.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001085d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1085D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012074.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12074 10312 bytes
SHA-256: 7630e8cabe966bdcded695214b363b1268fe8636b231972616353f4de6b1b98b
font_02_sfnt_off000137bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137BF 17228 bytes
SHA-256: e89e3b6ba27800388fa81b6487fadbd473d85725788bb1f43d62bcd4c950b87d

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