Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a5086472343e906…

MALICIOUS

PDF

100.8 KB Created: 2021-07-05 00:09:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 82a6c254b0d7121272b564ae91f4f55f SHA-1: 84f18c282791f8fe269183e6032bc24d25f62bce SHA-256: 8a5086472343e9067a5883b92459ccc7335f5cf6361dff13cdf9b5420e29f3d3
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It functions as a link farm, containing numerous URLs that point to compromised WordPress upload storage and other disposable hosting sites. These links are likely intended to lead users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://archism.ru/uplcv?utm_term=integral+multiple+of+3
    • https://coebmsf.com/userfiles/file/vesimiziwelepurarexo.pdf
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099b8f9f3b3c---jaxebipuxativivigovasa.pdf
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a05c858f54e---25344008935.pdf
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160c3c54eef73d---vizunakugenad.pdf
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/6700a204f0131d14c76e59257c5d9bef/mamoguzul.pdf
    • https://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/lerolexux.pdf
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d6fb219be8---zufibuwiwe.pdf
    • http://naturabliskociebie.pl/userfiles/file/98631227368.pdf
    • http://geniuschulatutor.com/userfiles/files/xazopibararuvelojaka.pdf
    • https://edusfera.pl/upload/file/suwawiwala.pdf
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/88nen9j6ica9q17kr0812t7f60/76738585452.pdf
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/2e6c0943fddc387fe0dc1033a87089f7/72570056905.pdf
    • https://tonymusic.se/UserFiles/files/58014681539.pdf
    • http://cocoal.com/uploads/file/60481065232.pdf
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/q3l13mvsaliao19cvah5uj8h91/bigapevazuzazajexo.pdf
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16086a4449fcc3---vugojakozadosunozezi.pdf
    • http://harchovyk.com/userfiles/file/fapunipezojidebodexen.pdf
    • http://fitnessklub-impuls.pl/uploads/assets/file/69148233450.pdf
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/160cb2f2e65023---74750863076.pdf
    • http://imailbox.nl/images/uploadedimages/file/64536297645.pdf
    • https://gute-reise.ru/i/files/files/39304014271.pdf
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/dace0f0e47ee0cb55e335c5fcc5e8b1e/zifevupolifog.pdf
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/jjqhdkpogh5aifchnvruvcsg6n/kabaduzuwurokededujukoj.pdf
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bdb1d1e351---65217035779.pdf
    • 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_off000127ce.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x127CE 16792 bytes
font_01_sfnt_off00013fe0.bin
5c1dd292bb7eb5aebdd43a16a35b0d77f4eab8443890a8e5fcf8040ee9e805f8
pdf-font-stream PDF embedded font (sfnt) at offset 0x13FE0 17244 bytes
font_02_sfnt_off00016d5b.bin
21144a16425d232570d57a48c798fbe19742975a8abe3e9cf8f712d1ff960819
pdf-font-stream PDF embedded font (sfnt) at offset 0x16D5B 10756 bytes