Malicious PDF — malware analysis report

Static analysis result for SHA-256 81ea3b3aa0ebf05a…

MALICIOUS

PDF

80.4 KB Created: 2021-09-09 11:51:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 44edc15e0eb57057a23b2a08c2d984b1 SHA-1: 34cf5c67da81bedb86f6e2363cb9d9b8c1979c40 SHA-256: 81ea3b3aa0ebf05a9a74c0ddf4a647bda31b3e11830339f05d5188bdfcc8e44f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm with numerous URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, suggesting the document is part of a campaign to leverage search engine optimization and compromised websites for malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5975

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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 http://sattosushi.com/uploads/files/bifovewaxaran.pdf In PDF document text
    • https://akvanova.ru/sites/default/files/66681716058.pdfIn PDF document text
    • http://xn--90aoa5aj.xn--p1ai/ckfinder/userfiles/files/baganefi.pdfIn PDF document text
    • http://kvarkeno56.ru/userfiles/file/6069289820.pdfIn PDF document text
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1612f316aabef1---2879803235.pdfIn PDF document text
    • http://www.naturhalles.fr/fckeditor/userfiles/file/suvojedinesijidug.pdfIn PDF document text
    • http://ahdjcm.com/upload/files/tuwaxifuzu.pdfIn PDF document text
    • http://hkxhjfc.ltd/uploads/files/20210907002312.pdfIn PDF document text
    • http://raczcsalad.hu/files/bikewagoboferugosixemag.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ede9bee2ae---japasinibafigan.pdfIn PDF document text
    • http://savaksangida.com/resimler/files/51464942024.pdfIn PDF document text
    • http://www.taimaobi.com/admin/ckfinder/userfiles/files/fafofufaguwuxalawesatumu.pdfIn PDF document text
    • http://clickvay.com/upload/files/96228314301.pdfIn PDF document text
    • http://polyacer-ecp.com/userfiles/files/20210901_071814.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/bb96912fcf95d9ed673b415f258ebbbd/bapekogepe.pdfIn PDF document text
    • https://al-wesam.com/userfiles/files/viwazivapuz.pdfIn PDF document text
    • https://panelshock.com/userfiles/file/wuradatul.pdfIn PDF document text
    • http://planet-for-events.de/userfiles/file/40328909086.pdfIn PDF document text
    • https://shoppe.everybodyisnotdoingit.org/gift/userfiles/files/11114809771.pdfIn PDF document text
    • https://aqua2go.pl/galeria/file/7215396618.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=terraforming+mars+colonies+rules+pdfPDF link annotation
    • http://louisiana-arts.org.s150269.gridserver.com/siteuploads/editorimg/file/37685545343.pdfIn 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_off0000ded8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDED8 10928 bytes
SHA-256: abb1d21a13b29cc8ea03b5d81e6c6866dba55c8727dc3cc47ccbda64e28e2882
font_01_sfnt_off0000f7dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7DD 17556 bytes
SHA-256: 7ea59e1448bddfba73c0a31d6e45be1348bc405be214191423b882b7eb6ff70c
font_02_sfnt_off00012563.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12563 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.