Malicious PDF — malware analysis report

Static analysis result for SHA-256 52e3799c94ed82a5…

MALICIOUS

PDF

92.9 KB Created: 2021-07-02 05:48:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 8aa4f39d5819a12a38408a53d00e9768 SHA-1: 738c7a6ece9183a5b91f21ba36ffc12e92ee66ba SHA-256: 52e3799c94ed82a5990042d268d7cb1d3215a007f3d4235a0825b82d61eaa59d
156 Risk Score

Malware Insights

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

This PDF was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to lure users to malicious content. The presence of numerous links on disposable hosting and the use of UTM parameters indicate a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b2f871eaa1d---fepoganijubem.pdf In PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/02e6d40a9775f2104820a02ddf49d7e8/kizupisepugufofexemuva.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///20216293956994.pdfIn PDF document text
    • http://www.elitagida.com.tr/wp-content/plugins/super-forms/uploads/php/files/q3r647qs9tsevbjhujnb35lut7/namase.pdfIn PDF document text
    • http://gchs1969.com/clients/867877/File/10080615113.pdfIn PDF document text
    • http://www.peretprod.ro/content-images/file/tunigejuzav.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c255b334518---nokawinoleb.pdfIn PDF document text
    • https://getadoc.in/ckfinder/userfiles/files/12447563776.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bdd1f36ba65---rosotuvuvu.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160828172686be---19618249690.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/f726de6debecacb49dadc901734f45a4/toxus.pdfIn PDF document text
    • http://dichvugiayphep.biz/upload/ck/files/samofitovalegoxogipi.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/673aed73e81b56aba1df9056ec14a0c0/48168460097.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/7431925649.pdfIn PDF document text
    • https://x-software.cz/data/file/51344319794.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/9d6d2db7200b9169120131a088fef427/rovonipaj.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/nl14tmf033drknchrifkaec983/63799734684.pdfIn PDF document text
    • http://thanhlapcongtykiengiang.com/upload/ck/files/lexewo.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/8e656e367b031a2362592c0131d0e690/rafedesekili.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/7nlh5ug13usvfqrth0n1qvq9k1/muvakitidose.pdfIn PDF document text
    • http://tycoonmedical.com/userfiles/file/jululofawoguw.pdfIn PDF document text
    • http://kompletucetnictvi.cz/files/file/24880891057.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/4084138b2ae66bcba49e931f9b701b3f/xubewolutosesuxemomi.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/dapegoxilizagivelowezep.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a817f4d2358---wuwamosoruxajorofidojoz.pdfIn PDF document text
    • https://hfdjet.com/wp-content/plugins/super-forms/uploads/php/files/a0856e84fd39534e1efec0e0f13b7ee2/2506805706.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=striated+muscle+histologyPDF 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_off000105bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105BC 11004 bytes
SHA-256: e04d0f6b8d92da4c45c4c5fcb9c13a3c23e4132e980c1e019beeee15b40c4e4d
font_01_sfnt_off00011f15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F15 18020 bytes
SHA-256: 32c0113f4c3ca3a50f5bef3eef5480b08b0c854c1de551937350929956c45782
font_02_sfnt_off00014e4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E4E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1