Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5c99d833d3c6b77…

MALICIOUS

PDF

64.0 KB Created: 2021-09-21 03:49:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 76e5ba404f907c2175bb34b2b99f6a51 SHA-1: 665ebd6f66785b2bbdac9fc0221690c81043e2c0 SHA-256: a5c99d833d3c6b77d2d613fff5f09b1c303f6c02f4777fc261e261e1e66a6c60
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a link farm pointing to various URLs, some of which are hosted on compromised CMS platforms. The ClamAV detection and ML classifier indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the link farm suggest an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7744

Heuristics 5

  • 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
  • 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://holidayservicemarsala.it/userfiles/files/42448285366.pdf
    • http://guowangcable.com/d/files/jilotaxapunuxu.pdf
    • https://tenfci.org/userfiles/file/3027792610.pdf
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1614910c88af8e---barobefupexej.pdf
    • https://petala.gr/userfiles/file/14951402570.pdf
    • http://www.aportecnica.com/imagenes/editor/file/mutizomelufofogam.pdf
    • https://hunglivet.com/uploads/files/202109041356521547.pdf
    • http://malerbetrieb-malanders.de/Webseite/pics/fotos/1/file/93869050461.pdf
    • http://xn--12cbg9dihj7egda2g6a7dceb1d2cp4nvgf4f.com/datas/files/xoritemutexajigomerulati.pdf
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/433e3a3912c95bb83eaa6211a0d0f5ab/lovumenavevesonutefa.pdf
    • http://khacvietlaser.vn/public/images_news/files/14674826444.pdf
    • http://mail.teleserviciomalaga.com/ckfinder/userfiles/files/vojirizonogonos.pdf
    • http://giteduguedesboires.com/userfiles/file/54646530299.pdf
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161426e6d29cb2---98198883066.pdf
    • http://telegid.tv/userfiles/files/56763234190.pdf
    • https://myvideoclasses.com/ci/userfiles/files/xatukifutev.pdf
    • http://giasuthanhdat.vn/Images_upload/files/36887003019.pdf
    • http://studioboscono.it/userfiles/files/8234069217.pdf
    • https://bartonsteel.com/tony/barton/ckfinder/userfiles/files/fawodowepumelexatezogike.pdf
    • https://ariconium.cz/webpagebuilder/ckfinder/userfiles/files/9309708564.pdf
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/e0cdc515821a016a0c7f4e2a96194e1d/mogogabuxib.pdf
    • http://growlink.biz/userfiles/file/zisumufavepitataledos.pdf
    • http://aquatherm-graz.at/files/74384358959.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=download+network+mode+apk
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e90e.bin
8efcb729f0d3f45732097ec34733e888ace6d460830d8ccb043017709612a708
pdf-font-stream PDF embedded font (sfnt) at offset 0xE90E 10472 bytes