Malicious PDF — malware analysis report

Static analysis result for SHA-256 028c92bc56ec9a55…

MALICIOUS

PDF

79.2 KB Created: 2021-09-13 04:08:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: fe0191a4885dca747d2cc86b19f61542 SHA-1: 363641fc0527e22b57f9394160639e92f3484df7 SHA-256: 028c92bc56ec9a55b8885b2b22cccc974eb6d4315ec2d29de777d4f2c52817df
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. Heuristics indicate it functions as a link farm, with numerous URLs pointing to potentially compromised or disposable hosting sites. The embedded URLs and link farm structure strongly suggest an intent to redirect users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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=stream+terminator+dark+fate PDF link annotation
    • https://webrekruit.com/php_codes/Scott/VieauAssociates/code/userfiles/file/93877302250.pdfIn PDF document text
    • http://www.niziointerior.pl/upload/file/96012124175.pdfIn PDF document text
    • http://standdominica.org/files/files/5856083540.pdfIn PDF document text
    • http://tinhdauvietnam.vn/upload/files/rutijatu.pdfIn PDF document text
    • https://propage.q-cloud.net/upload/ckeditor/pages/files/82424985695.pdfIn PDF document text
    • http://locke-3c.tw/uploads/files/202109061113372876.pdfIn PDF document text
    • https://momentous-inst.com/uploads/image/files/dedatitijufuzufobodeleg.pdfIn PDF document text
    • https://nabijdefossa.nl/upload/files/regulop.pdfIn PDF document text
    • https://cosplay-expo.it/ckfinder/userfiles/files/98704230511.pdfIn PDF document text
    • http://ewhamd.net/upFiles/ckeditor/files/70586021901.pdfIn PDF document text
    • https://jimsdelibrookhaven.com/demo/jimsdeli/admin/userfilesfile/71474056677.pdfIn PDF document text
    • http://shlawllc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/guvir.pdfIn PDF document text
    • https://reha.bg/content/upload/file/vajemajexagevobodisowisoj.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c96e6ec6c7---96325955675.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/c1588d4b0c9c72fbd071244a82388169/kigerosirupimodin.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/2aea948cbd474763c85a074d09e0d61d/43488049781.pdfIn PDF document text
    • http://metapolar.hu/tmp/suzavimowawepideji.pdfIn PDF document text
    • http://skupka54.ru/upload/m/79670714160.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613deb16ad112---67700161187.pdfIn PDF document text
    • https://dudikom.pl/userfiles/file/83904162007.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/05f7df5261ad06da54705ab5026d478d/44544787926.pdfIn PDF document text
    • https://www.educazionesessuale-scuola.ch/ck/ckfinder/userfiles/files/82018853724.pdfIn PDF document text
    • http://tcsklife.com/filespath/files/20210913030932.pdfIn PDF document text
    • https://bestcaps99.com/ckfinder/userfiles/files/wunufijepejimilazif.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/da67eebdc76ebea1fa0f6eac469de385/dewonamuruxozosanetemeluv.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_off0000d0a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e8b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8B3 17788 bytes
SHA-256: 39d7300036da05ad7322bd704f46ec6d39056f5e680296d8575255034034f96f
font_02_sfnt_off0001171c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1171C 10468 bytes
SHA-256: afddff1e91ed57ac135fac734ad70a927ac107d290b7ccc8be5995e2e5972b02