Malicious PDF — malware analysis report

Static analysis result for SHA-256 493fc711c697dc8b…

MALICIOUS

PDF

77.1 KB Created: 2021-09-16 23:13:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3163dd5339cd09f31e3a9654e42e5d91 SHA-1: dbb98392ee40acdf18172a12bda0bb8a11874c08 SHA-256: 493fc711c697dc8bbcaa2a72107cf6479a93ce94a2141247a7bd836bd44c391d
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and multiple external URIs, many of which point to compromised WordPress sites. The heuristic 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' indicates that these links are likely part of a link farm designed to obscure the true destination, potentially leading to phishing or malware distribution. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://wietsevoermans.nl/ckfinder/userfiles/files/50521837224.pdf
    • http://jobcred.com/rk/jobcred/uploads/image/file/26726539302.pdf
    • https://rails-bg.com/fckeditorfiles/file/20203484527.pdf
    • https://nwdglobal.com/ckfinder/userfiles/files/wukaritupetulamorix.pdf
    • https://vinniescustoms.com/userfiles/files/18330859392.pdf
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613582ced6735---76002205071.pdf
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161315a8a36402---40128577710.pdf
    • http://pantryscan.com/123cars/imagefck/file/25717127517.pdf
    • http://autohondl.cz/userfiles/file/85983580522.pdf
    • http://aihyang.com/userfiles/file/bolemulumazaritukabugo.pdf
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/16142a6831042a---wexadofijaxutonoji.pdf
    • https://ducthai.vn/userfiles/file/55470514372.pdf
    • https://clubesolbra.com/uploads/files/luwalilizozelilarivukomin.pdf
    • http://tks-forever.com/upload/2021/09/08/file/zerimuwagutebuboridad.pdf
    • https://sikdercollegeofpharmacy.com/scp/ckfinder/uploads/userfiles/files/megusajasorurapi.pdf
    • http://alconsprom.ru/ckfinder/userfiles/files/vepenadanunuvagolawixen.pdf
    • http://tearose-kitchen.com/sites/default/files/images/imcefile/suxodudagaxelifibiji.pdf
    • http://salon-urody-bellis.pl/images/file/tefuji.pdf
    • https://cvssteelex.com/ckfinder/userfiles/files/90783503509.pdf
    • https://www.dogandemir.av.tr/paketler/ckfinder/dosyalar/files/70225995749.pdf
    • http://zs-g.jp/app/webroot/js/ckfinder/userfiles/files/70798570513.pdf
    • https://tecnicadovolante.com/images/file/47298220289.pdf
    • https://strategieb2b.ca/userfiles/file/rululakelitufadofijafete.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=top+tv+live+cricket+app+download+for+pc
    • 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_off0000c8c2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC8C2 16792 bytes
font_01_sfnt_off0000e0d4.bin
591dc2f245c7a0b8e67c5710c4062b6c02c9fe872a5d8140e775c3310832a4c3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE0D4 17544 bytes
font_02_sfnt_off00010e40.bin
1e697f5962d0ba004eedcc6ebc6a31ffca2792548347f2e7a1cef5c1931f5a51		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10E40 10652 bytes

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