Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cf2eab787dfcb00…

MALICIOUS

PDF

79.8 KB Created: 2021-08-26 07:53:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7bce1a8b123bd92cc24f37aa98cf651a SHA-1: a3bb1b6337d54d79a764dc87fa4b3f3166cb5db4 SHA-256: 1cf2eab787dfcb00830bec8269ad425bb2ff3a26fb5c25581614b8eb78910c3c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a large number of embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The authoring application 'wkhtmltopdf' and the presence of PDF link farm heuristics indicate a likely attempt to disguise malicious links within a seemingly legitimate document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://chcial.ru/uplcv?utm_term=windows+cannot+be+installed+to+this+disk+selected+disk+has+an+mbr+partition+table PDF link annotation
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f29c36b6d36---76051365810.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1606f28961fff7---palipevuwelozorizinu.pdfIn PDF document text
    • http://sattamatkapatti.com/userfiles/file/64984657413.pdfIn PDF document text
    • https://oykufestivali.com/ckfinder/userfiles/files/8541741400.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a12260cbec3---gafepigosomuvutugijaf.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099bb8ba511e---42103301167.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092e2c97d7f3---wabifug.pdfIn PDF document text
    • https://mldom.xyz/web/img/podborky/files/kujupobatodekenoluvofuke.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b69247d872a---18159717891.pdfIn PDF document text
    • https://alibabaoman.com/basefile/alibabaomancom/files/saxobosurizov.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a638bd1f91d---57006957823.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1607e931b9a4bf---92854165596.pdfIn PDF document text
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/c163ebf2e4de3dcd240430f8531eff5e/89840619500.pdfIn PDF document text
    • http://palirna-frydek.cz/uploaded/file/10231565692.pdfIn PDF document text
    • https://umutisi.com/umut/upload/files/92878589764.pdfIn PDF document text
    • https://childprotectionindia.com/lexcyberia/userfiles/files/doxatevamofawaneno.pdfIn PDF document text
    • http://vejwun.cz/images/nudezokebarekijegeliketa.pdfIn PDF document text
    • http://gartenstadt-apotheke.com/userfiles/file/56231266667.pdfIn PDF document text
    • http://come2menorca.com/images/file/27203541353.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5327573fcb---goboboduwiwomulukavoz.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/pk55eg6mm3rijbm4chp08v2af0/wokupazarutovevetixe.pdfIn PDF document text
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/f222e3febc6e99e20ff74616cf80fd9d/53528073288.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_off0000d0ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0EA 16688 bytes
SHA-256: 6a6bd1783fb9e43ad2f88efa30863836d999cd02d97f4d18378ac7f8e4a9b2a0
font_01_sfnt_off0000fc55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC55 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001146c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1146C 11092 bytes
SHA-256: 185e6d47fb91e3510a6ef73c9f4517fc9e13f9f787241bdc7e5f18013ffc3d6c

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