Malicious PDF — malware analysis report

Static analysis result for SHA-256 85e1688d6528de32…

MALICIOUS

PDF

87.3 KB Created: 2021-07-01 17:13:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 47eec3522dc1f96f59cb58e95e355318 SHA-1: 3efb46eb61db5e8e4e18ec8a5085b19dd0447ce5 SHA-256: 85e1688d6528de326965ab9bf05fc27650159393c40045cdb6155e731179590d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. The presence of multiple compromised CMS upload links further supports the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db27ef4c54e---jatofuvedawimit.pdf
    • http://aihyang.com/userfiles/file/dumanujumuxedalon.pdf
    • https://soalmatematik.com/userfiles/file/86125884990.pdf
    • http://brette-animation.com/userfiles/file/kasojalufi.pdf
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094baaaa69fd---17678822507.pdf
    • http://bukharaatlanta.com/sites/default/files/file/noloxisevazekorebut.pdf
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ee11085cd6---zotelafikapujat.pdf
    • http://tingchucontrol.com/Uploadfiles/files/77287937103.pdf
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/1cdf9raeguhaji8v8g0384c0o7/15194465459.pdf
    • http://web68s.com/upload/files/gegoziriwamabumalinu.pdf
    • https://bawwabatrizq.com/userfiles/file/xozorarofelozexozevabi.pdf
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/b185f4642d4e6c763c68bf5d579a8e95/30769345849.pdf
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc87fd5285---14816365967.pdf
    • https://ecobox.eng.br/wp-content/plugins/super-forms/uploads/php/files/42v8oekgedhklnrd4av5f1ilt6/kixoxexu.pdf
    • https://varbackaforskola.se/ckfinder/userfiles/files/kosedizotunela.pdf
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160867ecf2d761---xoxisobakowikagidefolitej.pdf
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160aba8ae11dd4---89818597332.pdf
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd016c026f2---84454258866.pdf
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160822bd78f506---96616528392.pdf
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078706ce1f04---46923928657.pdf
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d0195781ddb---zusatalafuxagaloletepa.pdf
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/23b0d2c4ad0f8831196622b4415cf93f/89459114800.pdf
    • http://dailyxedayhang.com/userfiles/files/poxajuxudazefujo.pdf
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/3vrcm5bbt51vim76mnag6rmtsf/lafofusefaxewojapufexisab.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=my+dogs+teeth+are+loose
    • 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_off0000f2f2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF2F2 16792 bytes
font_01_sfnt_off00010b09.bin
012366f82cb0087c5e8a206addb12222da8a3874bb80e8b0231174c1e84b9b04
pdf-font-stream PDF embedded font (sfnt) at offset 0x10B09 10440 bytes
font_02_sfnt_off000122ac.bin
1d54ea4951b494fc2cccd9abdc521956dd951783c69a8f8f255b372ffa3568e4
pdf-font-stream PDF embedded font (sfnt) at offset 0x122AC 17392 bytes