Malicious PDF — malware analysis report

Static analysis result for SHA-256 68bdcca6c6b8aa81…

MALICIOUS

PDF

80.7 KB Created: 2021-09-14 00:22:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 977251c92ecaf7c5ecf2535b996adf00 SHA-1: 161fc56d23eb401dceae0afe9d4ee36210e6a452 SHA-256: 68bdcca6c6b8aa81989a8447872f3f02ce761817d0c8fefabe114bf7cd88bc9c
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple domains, many of which are hosted on compromised CMS uploads, suggesting a phishing or SEO poisoning campaign. The document body was not readable, but the heuristics indicate a pattern of distributing links to potentially malicious PDF files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/16135d1a02b969---53021729048.pdf In PDF document text
    • http://bebsulmare.com/userfiles/files/jejikaromojipimolexonijo.pdfIn PDF document text
    • http://aeklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sipawul.pdfIn PDF document text
    • https://ddc-touggourt.dz/ar/files/13213782939.pdfIn PDF document text
    • https://prtl.pl/userfiles/file/99146150046.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/01e1defe10f2245f4215c521adfac1d8/bulomadirilaribukemusonav.pdfIn PDF document text
    • http://jmvlpslimited.com/ci/userfiles/files/73776997067.pdfIn PDF document text
    • http://shriadinathbank.com/uploads/34525124679.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/75850914703.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/manopujasumewonenik.pdfIn PDF document text
    • http://sushimura1.com/uploads/files/tupaku.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/16139482811328---jatoxur.pdfIn PDF document text
    • https://ekransamara.ru/files/davugikuseserug.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613910e976fe5---34996833635.pdfIn PDF document text
    • http://goopenapp.com/uploads/files/mutaluw.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16135c0ad594bd---xonisirulamu.pdfIn PDF document text
    • http://cartopack.com/Images/file/sexofebisixofiwuvif.pdfIn PDF document text
    • https://www.pepinieres-gey.fr/ckfinder/userfiles/files/katenir.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a11014fe56---44403298605.pdfIn PDF document text
    • http://tzsunup.com/upload/38119937871.pdfIn PDF document text
    • https://tongdaidoanhnghiep.com/app/webroot/upload/files/5169344094.pdfIn PDF document text
    • https://sibconsulting.com/contents/files/43536195894.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=completing+square+method+stepsPDF link annotation
    • 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_off0000d434.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD434 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC46 18332 bytes
SHA-256: c9b4276867d3415c87a9f6f45b7db2a944347f5729daba3fc71a768b708247e1
font_02_sfnt_off00011c04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C04 11116 bytes
SHA-256: 2966136d5662fe654d51659e8feaa35b1b95a403d805202b18e63b816977b25f

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