Malicious PDF — malware analysis report

Static analysis result for SHA-256 066ff04c7bb43e91…

MALICIOUS

PDF

69.3 KB Created: 2021-09-29 02:48:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6301805882f8885247c500627e2ede53 SHA-1: 47842222eaf7f7cf66e3ed36f2d7f72828c61bab SHA-256: 066ff04c7bb43e919d20f929947e9b43bf4672fabd2c749260c83a6b427c05e1
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. The document contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://archism.ru/uplcv?utm_term=best+dialer+contact+app+android PDF link annotation
    • https://feltshoe.com/userfiles/file/40594618952.pdfIn PDF document text
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/fesigawesuf.pdfIn PDF document text
    • http://xiangzhuan.tw/upload/files/31244589336.pdfIn PDF document text
    • http://malerbetrieb-malanders.de/Webseite/pics/fotos/1/file/vuwowomusasodizinav.pdfIn PDF document text
    • https://loonbedrijfschimmel.nl/userfiles/files/libuxolelazemozasofupukap.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/722bf21034519cd154d8f74b412d01dc/59926205819.pdfIn PDF document text
    • http://nofatrans-int.com/userfiles/file/21661830150.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/bb36160e1b9253bdf4755d1dc6417823/35296841815.pdfIn PDF document text
    • http://mc-opony.pl/files/file/xabobow.pdfIn PDF document text
    • http://nj-rshb.com/v15/Upload/file/202192310128565.pdfIn PDF document text
    • http://oppedisanorobertosrl.com/userfiles/files/6052976670.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145a428100bc---nurizefotuwegaxu.pdfIn PDF document text
    • http://deauville.ru/files/file/16408919450.pdfIn PDF document text
    • http://kryotherapie.net/neu/userfiles/file/sowerevezanuvem.pdfIn PDF document text
    • http://summitremodelinginc.com/userfiles/files/zefikezitorexitime.pdfIn PDF document text
    • http://xn--b1akwe.xn--p1ai/userfiles/file/xujapoginuwevegizo.pdfIn PDF document text
    • http://language-coach.pl/uploads/files/ralojepulazo.pdfIn PDF document text
    • http://newkontakt.ru/userfiles/images/file/91811370470.pdfIn PDF document text
    • http://ambiance-cinema.fr/wp-content/plugins/super-forms/uploads/php/files/8ec426b584577c3f63ccb125d52fbf7b/vuvagiwebaxedejevososegu.pdfIn PDF document text
    • https://speculatio.in/userfiles/file/35345302106.pdfIn PDF document text
    • http://fillaracingacademy.cz/ckfinder/userfiles/files/99167641587.pdfIn PDF document text
    • http://namuvaldymas.lt/userfiles/file/60543287271.pdfIn PDF document text
    • http://gomail.vazoom.com/pictures/dusivenul.pdfIn PDF document text
    • http://superfishinglewood.com/uploads/files/fobijiwikonepivol.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_off0000b213.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB213 10560 bytes
SHA-256: 5ba0298d96ba936b58285cb99da5ddf78e3a75ef962a7b2c150cab1adfb046fa
font_01_sfnt_off0000ca47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA47 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e259.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE259 14812 bytes
SHA-256: 595e850a02dbe1459c09d542336b10f073ef3d6616f3b4fbf9712017cbdb4860

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