Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a6a1ec904d525fa…

MALICIOUS

PDF

89.8 KB Created: 2021-09-02 22:47:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 43be1c402558214f30690f3a78e49a04 SHA-1: 850219d44d3140ebba2ae23a6246cc283c28342d SHA-256: 8a6a1ec904d525fa46997f246961851769cfb02ec37df809ecee034e5659df1e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier with high confidence. It contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users. The presence of these links indicates an attempt to direct users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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=software+engineering+pdf+myanmar PDF link annotation
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/b49a16071260195d803c4d5d61b29921/81513869956.pdfIn PDF document text
    • http://debseven.net/UserFiles/File/41530681313.pdfIn PDF document text
    • http://remont-m.com/userfiles/file/5631939480.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160960cf33b760---7024012359.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7b592e78cf---87317230181.pdfIn PDF document text
    • http://salkim.com/userfiles/file/turepupegupene.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca06cc389bd---meragun.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/160b9c8f4b1cd2---41111322558.pdfIn PDF document text
    • https://mystruggle.uk/indigo/ckfinder/userfiles/files/tejizexazuwanagabebuno.pdfIn PDF document text
    • https://batikatravels.com/userfiles/file/36283555123.pdfIn PDF document text
    • http://dobre-jaja.com/Upload/file/mivegepesamutid.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/jg5nlfvf5mqrli8ue8ut1e54h3/matasawivubixekininub.pdfIn PDF document text
    • http://telekommarketing.com/firme_data/files/narefejabidedasitixuwemen.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/lozetofib.pdfIn PDF document text
    • https://turkihale.com/userfiles/file/71736736175.pdfIn PDF document text
    • http://www.lukoilmarine.com/ckfinder/userfiles/files/joxulelofubezigafogudanif.pdfIn PDF document text
    • http://www.companyforte.com/imagenes/editor/file/66317117213.pdfIn PDF document text
    • http://ingmarcofaedi.com/userfiles/files/mopogivatigagagiwalixew.pdfIn PDF document text
    • http://sushi-belovo.ru/files/43872691013.pdfIn PDF document text
    • http://banphimchuot.com/userfiles/file/87995365938.pdfIn PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/93f5caabc8ba91e6a6f19155c20ec4a2/nexogununojig.pdfIn PDF document text
    • http://bogieclassof67.com/clients/71235/File/norat.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_off0000f91f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF91F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011131.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11131 18376 bytes
SHA-256: 859baa62a196c2a7578093b9cd4bd172a789df5e9763bb99893328b8cd27959b
font_02_sfnt_off00014047.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14047 10900 bytes
SHA-256: ff1e89d5bb216fac46b559a651d649e0d1cf497d8f0eb7574d3877c68bb8703e

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