Malicious PDF — malware analysis report

Static analysis result for SHA-256 a91ee03c80598647…

MALICIOUS

PDF

99.9 KB Created: 2021-07-03 11:06:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: addae2216f066eef2dc38e6482a4dd45 SHA-1: 02f07d200a6585f5284a1560bf2eecba49a49a35 SHA-256: a91ee03c80598647c8cc178932893fb5c558a792cf6b3959256ccf42d2dff58d
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 the document functions as a link farm, with numerous URLs pointing to compromised WordPress upload storage and disposable hosting. These links likely serve to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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://tidurmalam.com/contents//files/pepubasufiporugekifu.pdf
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/8c8794bae41c1de592478b3e77439c48/sebusin.pdf
    • http://chizclean.ru/files/fck/file/xomepaxidijexefase.pdf
    • https://tongdaidoanhnghiep.com/app/webroot/upload/files/rinadapobixilolopikeviban.pdf
    • http://lafayetteconnections.com/clients/52818/File/gigozolokuwosijuvixebuvi.pdf
    • http://rhodeislandalpha.com/clients/56223/File/mojajikigogapakalisexe.pdf
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/e14aa114f29cea3b590350ad7fee8c3e/xenotalipizilegegixixiz.pdf
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a162dfca52d---digexosoragid.pdf
    • http://bluecars.pl/userfiles/file/romubune.pdf
    • http://matstravel.ru/userfiles/file/jewuworitotukanixasa.pdf
    • http://poltinik.ru/userfiles/file/muxabininupedij.pdf
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa13dbcebc---12212068016.pdf
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/mgjolpr3ma75pq51pseb106b86/vogilu.pdf
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a43a7e31af---dalabuvidajimemul.pdf
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099faddcdf30---vimaxowelubosanen.pdf
    • https://orldoc.ch/wp-content/plugins/super-forms/uploads/php/files/0jvbv1s5cvc44cvfocfri78nc0/28952559090.pdf
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdee9847b12---38753170961.pdf
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b609d741550---levedofi.pdf
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082860cbc203---xubudejabetunitafixow.pdf
    • https://eletvital.hu/uploads/files/22853050330.pdf
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/c6d90111598cd8349aaadab8e49afa5d/pidowigug.pdf
    • http://2ds-creations.fr/userfiles/file/69096303159.pdf
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4d65fbbbb8---fonigetakizag.pdf
    • https://producedepot.us/userfiles/files/12191576578.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=mild+lucency+means
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000124b2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x124B2 16792 bytes
font_01_sfnt_off00013cc9.bin
49505845a7c13d6716fa4e9e4f01cba561ab430dc9688e245ed824e38f5d0fe4
pdf-font-stream PDF embedded font (sfnt) at offset 0x13CC9 10420 bytes
font_02_sfnt_off00015455.bin
b5ed838f9bdf2e988d2429f2fbcbb4c47d3fb838d7116043a984ee83f1a45f98
pdf-font-stream PDF embedded font (sfnt) at offset 0x15455 17764 bytes