Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad40ab268991507b…

MALICIOUS

PDF

74.0 KB Created: 2021-09-08 03:59:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 11a33e181be2cd63c064d45c69daefba SHA-1: 546ed12918ac39c54c701af495d1c2d928ecf246 SHA-256: ad40ab268991507bfe952ca0a76cede4abca7979cf896780d56998a23f4eabb3
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. It contains numerous embedded URLs pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users to malicious content. The presence of these links suggests the document's primary purpose is to facilitate phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://crysiq.ru/uplcv?utm_term=y%C3%B6kdil+sosyal+bilimler+sorular%C4%B1+pdf PDF link annotation
    • https://pristineleather.com/userfiles/file/62409443346.pdfIn PDF document text
    • http://atdawnwelift.com/userfiles/file/fojegizetijibuk.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/bf0a926ab7cece519386cdf47b957941/79759213664.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/70frh1corkt2i3bkkqqqbktk23/soxux.pdfIn PDF document text
    • http://zavalinka.by/var/upload/file/18889252078.pdfIn PDF document text
    • http://ff-engineering.com/userfiles/files/tenilegukotadeluradalo.pdfIn PDF document text
    • http://gardatrans.com/content/Files/48077341472.pdfIn PDF document text
    • http://dvarenda.ru/upload/file/99869211053.pdfIn PDF document text
    • https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/b61e9e0a75dfcda59b196a108de1583d/duwegakusugafisija.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160947b916d98c---vorodewozoku.pdfIn PDF document text
    • http://www.grupoaccs.net/ckfinder/userfiles/files/bofotowusasowep.pdfIn PDF document text
    • https://binhvi.com/upload/files/11837523788.pdfIn PDF document text
    • http://nanopena.cz/upload/file/wonarafoxikekexake.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/16128e6c1aff75---19544694558.pdfIn PDF document text
    • http://jedwines.com/cmsCart//upload/file/tatazupanudagiwakow.pdfIn PDF document text
    • http://marcus-1.com/FileData/ckfinder/files/20210824_FE90AE95A23633AE.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a52164162e0---13042245138.pdfIn PDF document text
    • https://www.kiemtoandongnghi.com/public/plugins/ckfinder/userfiles/files/62030279506.pdfIn PDF document text
    • http://cuboni.com/uploadfile/hong202108311512383796.pdfIn PDF document text
    • https://xn--psg-9lac.hu/files/files/18568639549.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc8c28c6d57---mevolagidelosevosodofip.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ad049dc4467---98888438722.pdfIn PDF document text
    • http://slenderclub.cz/ckfinder/userfiles/files/82873404884.pdfIn PDF document text
    • http://agrion.org/upload/fichier/dalejeputujanalud.pdfIn PDF document text
    • http://savalis.ru/userfiles/file/45553160808.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_off0000bb33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB33 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d34a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD34A 11148 bytes
SHA-256: fbb258a0c5f0ffb74fe5c938cd543a1ac0b7307dcab1b004cfe7f12f36ec8357
font_02_sfnt_off0000ecb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECB6 17948 bytes
SHA-256: 2e9cb7ca904a15fc1e47bab796ea718062b9e4d70dfc2770d7e618b02e5bf0bc