Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e96994b5485e19d…

MALICIOUS

PDF

78.1 KB Created: 2021-09-02 15:47:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 085c21791ea04f466b0fb082f5d4bb1e SHA-1: 1e79cd662cc505719705d62b771d0cac02a11493 SHA-256: 8e96994b5485e19de2fcf96bff1bf80fa257f54281b7ea1d9c47020e09623dbc
156 Risk Score

Malware Insights

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

The file is a PDF that contains numerous embedded URLs, many of which point to compromised websites or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://huntic.ru/uplcv?utm_term=greeting+and+farewells+worksheets+pdf PDF link annotation
    • https://bibliotheque-des-arts.ch/ckfinder/userfiles/files/48923712755.pdfIn PDF document text
    • http://zeguvietnam.com/uploads/ckfinder/files/7340111370.pdfIn PDF document text
    • http://nirmalapublicschoolerumely.com/userfiles/file/33893299307.pdfIn PDF document text
    • http://westhollywood.ilovepokebar.com/uploads/files/gidemonejetube.pdfIn PDF document text
    • http://www.anglometais.com.br/adm/Editor/ckfinder/userfiles/files/ziteniralazidujetifulizu.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/570bdfdaae39ecf0280739dfd3b2e96d/seluligifufivu.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/7hs61vc8ft2ksb15hrphk54q8a/xebutuxumajuredojeb.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160b8cd0d19bd9---fazozekinuw.pdfIn PDF document text
    • https://alyosserspneed.com/userfiles/files/10301081176.pdfIn PDF document text
    • http://3asoft.vn/img/files/turitidatenanokitujoge.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/51090586278.pdfIn PDF document text
    • http://seksdagen.nl/userfiles/file/xewenemilujokirufumunan.pdfIn PDF document text
    • http://dashoernerboot.de/userfiles/jaxuremimefejol.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a598b9fd56---43265305004.pdfIn PDF document text
    • http://sgyscom.com/upload_fck/file/2021-8-10/20210810124119138897.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/tsob80tiu5483n8hrcq58escs2/91474037088.pdfIn PDF document text
    • http://xindeshiye.com/uploadfile/file///2021081103302570.pdfIn PDF document text
    • https://techielingo.com/fck_uploads/files/dokebafojowaw.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ab9138c388d---78737803142.pdfIn PDF document text
    • http://hainescentreasia.com/images/file/vepukigaxigu.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/160f74d5e01c7b---jivalatikaju.pdfIn PDF document text
    • http://rewitex.pl/userfiles/file/88682270775.pdfIn PDF document text
    • https://agriturismoilcolle.org/userfiles/file/lawekujewupidomino.pdfIn PDF document text
    • http://shepardinteriordesign.com/rw/upload/file/71129526425.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_off0000cc00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC00 17440 bytes
SHA-256: 79724ca30c9c60f92b4c86cbfd7ff8d7e240cf9a8e99132053b51d05f99a6052
font_01_sfnt_off0000f8fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8FE 10992 bytes
SHA-256: b1bd63dd6d6fc77756cb6ceb8ebc784fd7c652de67673fca6160d8ead4576161
font_02_sfnt_off00011259.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11259 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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