Malicious PDF — malware analysis report

Static analysis result for SHA-256 f289bccdb7c255f1…

MALICIOUS

PDF

81.7 KB Created: 2021-09-04 12:22:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 08ab70bf4626351310d401e2a5cc4320 SHA-1: f088105c2627f0abfaad910afc2ad4b735ba0eed SHA-256: f289bccdb7c255f135782b210bde4901e208c74abea17f5c69fcd444e0534b53
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV. It contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, suggesting a link farm for phishing or malware distribution. The document body is heavily obfuscated, but the presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicates a strong intent to redirect users to potentially harmful 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://studioingegneriavaragnolo.com/userfiles/files/74643554650.pdf In PDF document text
    • http://gildiamasterov.ru/userfiles/file/kudelitoxoka.pdfIn PDF document text
    • http://openendrep.com/userfiles/files/62592440718.pdfIn PDF document text
    • http://austria-ex.com/images/blog/file/xavarapunewomibex.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/16076ebfc0332e---sovimelolorodepabokevet.pdfIn PDF document text
    • https://tourpon.kr/FileData/ckfinder/files/20210810_D095FF24810DC92F.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/7f46e4df2b42641749ff3be7202ab31e/59317632968.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16072ad0e5d285---55568250380.pdfIn PDF document text
    • https://eingangrad.ch/userfiles/files/rusujewijilosife.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/p8ku4a2srhtko8tcev9mmg3d87/remujujorileluxi.pdfIn PDF document text
    • https://air-separation-supplier.com/d/files/jivemifumamuzusan.pdfIn PDF document text
    • http://short-story.ru/upload/file/fomabuke.pdfIn PDF document text
    • https://stillwaiting.org/userfiles/file/zetadunepisutu.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160890993d4c3f---pudewu.pdfIn PDF document text
    • http://ibrahimalsada.com/pics/file/78085044127.pdfIn PDF document text
    • http://aristosaigonhotel.com/uploads/files/60630850853.pdfIn PDF document text
    • https://aparcaderoshaddaichile.cl/uploads/images/files/1546050215.pdfIn PDF document text
    • https://butchercurnow.com/img/shop//contents/71781043616.pdfIn PDF document text
    • http://mega-stainlesssteel.com/uploads/image/files/72687166898.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612d613246c88---jekanoxoxiwabumuralezag.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b0cecda8121---77701033904.pdfIn PDF document text
    • http://studiodrago.eu/userfiles/files/91648622829.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/piwagutubavakavepisibevor.pdfIn PDF document text
    • https://amitadevnani.com/userfiles/file/luzavujuve.pdfIn PDF document text
    • http://jfhcoaching.nl/userfiles/files/dewixadutuxu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=bank+of+maharashtra+cheque+deposit+slip+pdfPDF 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_off0000d859.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD859 11276 bytes
SHA-256: f7407529f7cbd9a1f92df7ac56c70670d96cf4b82aec6900d662dc96a93db959
font_01_sfnt_off0000f271.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF271 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010a83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A83 17928 bytes
SHA-256: df86835eafca261bd221cd223b9b4d7c029ff373e9273ab368b60f3acf51366b

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