Malicious PDF — malware analysis report

Static analysis result for SHA-256 86d2d26fe4483809…

MALICIOUS

PDF

84.8 KB Created: 2021-09-27 11:21:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 65720c373662bdd82be9f04f8772be09 SHA-1: a80cc0a258487aaca54e96456f7c70545fbb13da SHA-256: 86d2d26fe44838097834575c1a6541ab954f9440adcb9f2585c29590b5da315d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://coretry.ru/uplcv?utm_term=sniper+3d+assassin+mod PDF link annotation
    • http://bfttacg.marketsearching.com/upload/files/wivezipunar.pdfIn PDF document text
    • http://carneslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/norujafiwi.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/79000409940.pdfIn PDF document text
    • http://epmachine.ru/d/files/69480307066.pdfIn PDF document text
    • http://mamitobe.ru/files/file/rinaxifefifomigalogopu.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613686c2291f7---wozokizijedajuzero.pdfIn PDF document text
    • http://cutskytools.com/d/files/70283815671.pdfIn PDF document text
    • http://soluzionebenessere.eu/userfiles/files/kemurekogi.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/16148f0ceb28c7---47389554845.pdfIn PDF document text
    • http://kabinet.puzat.ru/marafon/uploads/files/wapadibadisopipa.pdfIn PDF document text
    • https://bimetoor.com/basefile/bimetoorir/files/28438525671.pdfIn PDF document text
    • https://www.champagne-auge-dascier.com/ckfinder/userfiles/files/fezekatepulojujezepilolom.pdfIn PDF document text
    • http://belst.by/upload/file/daguw.pdfIn PDF document text
    • http://reliancefla.com/admin/images/file/75788277705.pdfIn PDF document text
    • https://dakotaterritorydevelopment.com/ckfinder/userfiles/files/liwopujiwanimatiluvu.pdfIn PDF document text
    • http://kqcme.yiaiwang.com.cn/upload/files/20689884850.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613cc98535f13---8630485271.pdfIn PDF document text
    • http://enidental.com/userfiles/file/20210917202441.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/16141077d9bd13---28771582706.pdfIn PDF document text
    • http://khunghinhdepphuctin.com/media/ftp/file/wemugobilulavinokajimamo.pdfIn PDF document text
    • https://alcoquimicos.com/ckfinder/userfiles/files/josotesilejuga.pdfIn PDF document text
    • https://organicfertilizerproduction.com/d/files/rowejibegedabugumofiv.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613245f224529---mojawivo.pdfIn PDF document text
    • https://irisapp.cn/uploadfiles/fckeditor/20210905/file/16308323156411.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c670.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC670 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000de81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE81 16188 bytes
SHA-256: 800554d3d6320da9c8ab21a3ad3d270f40e7a92360d7538c059d647d952d1d34
font_02_sfnt_off0000f438.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF438 10656 bytes
SHA-256: 505a0d419535f081a61c3d96f7c07532017197f5e250bc768208f6223692162b
font_03_sfnt_off00010c85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C85 21720 bytes
SHA-256: 59fe3932825cc813d04f4944ef18b3fac04911c73e4e24493a78727cad9ad592

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