Malicious PDF — malware analysis report

Static analysis result for SHA-256 dafef6a58ccf6d04…

MALICIOUS

PDF

97.7 KB Created: 2021-09-08 03:47:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c68fdbc81a2a1a7c586c083b7b698921 SHA-1: 25c44264efb949a2af9ab546fd2a66eb7b110c25 SHA-256: dafef6a58ccf6d041f4060dc6863e596091ed65df279021b2adb63470fbb4199
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of external links, many of which point to potentially compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and link farm behavior suggest it's designed to lure users to malicious sites, possibly leveraging embedded JavaScript for redirection.

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://cochleartudaskozpont.hufiles/95803055052.pdf In PDF document text
    • http://dzwigipoznan.pl/userfiles/file/9848902919.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160a25a469e7f1---65210806670.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160afea26d5446---54817415705.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/a936d63375e2841f26c0ba66edd7aa74/53698276414.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/92706c4d6ccac5f3e6db010ebe1b8f09/3487680035.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/b8b09558601f23bb656fd4bea924c813/17853647936.pdfIn PDF document text
    • http://xn--80aikni6a0b.xn--p1ai/images/file/kafojaximajazudesavofu.pdfIn PDF document text
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079b9c30ee6e---xajin.pdfIn PDF document text
    • http://dtyxbpzx.com/filespath/files/20210814151404.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070c82183858---gusikulefabuvopejowukeso.pdfIn PDF document text
    • http://www.fd.ntou.edu.tw/ckfinder/userfiles/files/69046415033.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/j3hpuufm4gd4k6teutdjv0bodm/nozitebusugikulazekiteju.pdfIn PDF document text
    • http://bukharaatlanta.com/sites/default/files/file/fekika.pdfIn PDF document text
    • http://drukarnia-warszawa.pl/pliki/file/80985549115.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9b0bc53872---mesirulatosifilafi.pdfIn PDF document text
    • https://t2sc.me/userfiles/zusorazopozirusufu.pdfIn PDF document text
    • http://agrocare.hu/ckfinder/userfiles/files/pufosuwogumapifaxuroru.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/2ea3070b56c1b357974a90b582f70436/80039341609.pdfIn PDF document text
    • https://ises.ca/phpsites/vertical_living/uploads/file/gaporipov.pdfIn PDF document text
    • http://komodovo.ru/upload_picture/46769953119.pdfIn PDF document text
    • http://coss-wynn-reunion.com/clients/d/db/dbe3622004495b304d8703879a486b7d/File/52946996301.pdfIn PDF document text
    • http://zhuoer.ltd/userfiles/file/zeribidoxibuzatuxek.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=architectural+design+with+sketchup+pdf+free+downloadPDF 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_off0001179a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1179A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012fac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FAC 18140 bytes
SHA-256: 11918d695783e2b45248d04aa09b30f7310ed5ad887ea5b681f172e2d7762b03
font_02_sfnt_off00015ecf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15ECF 11156 bytes
SHA-256: 2483f8e493da229e68fb8dc874b1977e2bf1cbf4f0c9fc85612ea964452bc61a

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