Malicious PDF — malware analysis report

Static analysis result for SHA-256 94228c0a159f6459…

MALICIOUS

PDF

88.7 KB Created: 2021-08-05 23:42:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a66dc38acac4d7d427e3000cb80afdf1 SHA-1: 3c0c6b7acc61dd0744e857dd8b33250eb5f4358c SHA-256: 94228c0a159f6459495e2d5488248f327399b925f4770c069a10b5234c460119
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://drafthe.ru/uplcv?utm_term=the+crown+kiera+cass+pdf+free+download+english PDF link annotation
    • http://gpba.ge/admin/ckeditor/ckfinder/userfiles/files/fatarexubijomukogipawa.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/a9kf91fnv3crnimutpskddhf60/fofumerefofuzunezidide.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/16100ef7c7eba6---dadiriwup.pdfIn PDF document text
    • https://mvservice.it/file/96420109833.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160875f90df75b---40538234219.pdfIn PDF document text
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/umrh7kuv07npuaa7ftc2j5q0uq/sudatuxofizijez.pdfIn PDF document text
    • https://grandhotelbulgaria.com/userfiles/file/33323888037.pdfIn PDF document text
    • http://thessalonikiflights.com/files/files/notegof.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075a6e22d716---wiweb.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/160b7621a80a43---37105263434.pdfIn PDF document text
    • http://mcutech.net/upload/2021/06/file/16249278311536066541.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/80305086156.pdfIn PDF document text
    • https://harryfok.com/ckfinder/userfiles/files/wuwas.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec428257b25---dasizonasek.pdfIn PDF document text
    • https://zapret-rf.org/web/img/podborky/files/sakineriroguluvafapixovik.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607e3203a91cd---bulozesitigajorawoxem.pdfIn PDF document text
    • http://sns.hu/_user/file/46920023878.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-7-26/20210726105807921586.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607a07cff05ca---80792032370.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608944deecaf1---94300797588.pdfIn PDF document text
    • http://flygarfield.net/userfiles/file/wokebenunopolobi.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/16071a9d421119---4892360898.pdfIn PDF document text
    • http://erfaspot.com/resimler/files/natosawujobazilo.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/160abf75f0097b---33819526586.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4dd18d0c29---54610866091.pdfIn PDF document text
    • http://umrllc.com/userfiles/files/galokuj.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_off0000f322.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF322 17552 bytes
SHA-256: 272c909b286907d4282e16a8b94fa53b112e1473f627e87e6180c2f2a419d41f
font_01_sfnt_off00012149.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12149 10940 bytes
SHA-256: b0f5cfbd9dea9aeb9e511d763545b0dd661116b8f023adc69a0861f76e4924c0
font_02_sfnt_off00013a73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A73 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1