Malicious PDF — malware analysis report

Static analysis result for SHA-256 451c0dbdb252717c…

MALICIOUS

PDF

92.8 KB Created: 2021-09-02 11:51:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 559c57751a9ef57de9a89fc526a865ee SHA-1: 6489963d4193f05301cebf9767e258727c6fce76 SHA-256: 451c0dbdb252717c5746913850f42930df090f20eaf5f5685c6b07407ff7d755
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external links, many pointing to compromised WordPress sites. This suggests the document is designed to lure users into clicking links that could lead to phishing pages or malware downloads. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

Heuristics 7

  • 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.
  • 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://wastran.ru/uplcv?utm_term=armytek+wizard+pro+xhp50+manual
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/160aba7f3b19c6---xutenanapamupizetujoledik.pdf
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160911eca8d027---waxonur.pdf
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607a18a9c2e70---fexagejoxekufudu.pdf
    • https://ataru.site/js/ckfinder/userfiles/files/22906530291.pdf
    • https://dailyhondaotomientay.com/upload/files/12738997627.pdf
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a77321e6af3---8143960708.pdf
    • https://nnt52.ru/userfiles/file/pusurejexobigorogojemuzap.pdf
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609c16989732a---wilid.pdf
    • https://bahamianbrewery.com/ckfinder/userfiles/files/vapak.pdf
    • https://thefencedocumentary.com/adminfiles/file/71164062167.pdf
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160755749a6a68---vafefolubebijobigugerifim.pdf
    • http://studio5r.com/userfiles/files/zopevipagisepo.pdf
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160705e77a646e---16009346028.pdf
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ae4d092189d---25563327407.pdf
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607c76751707e---878184694.pdf
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/16104fa72ba187---18739181647.pdf
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/tldka1no9p05ol3ddh0gs8uumb/12871450540.pdf
    • http://bassbasement.org/userfiles/file/jeduwedurulut.pdf
    • https://bahispesinde.com/gnc/veri/_files/sewapasi.pdf
    • http://lianbang123.com/uploads/files/202109010108501838.pdf
    • http://jungvassar.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gakumidifamajewigijeg.pdf
    • https://idroilektriki.gr/files/file/36122813976.pdf
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dc109c0ee2---womozafuj.pdf
    • https://mtydizayn.com/userfiles/file/deletubepum.pdf
    • http://consulcongress.it/uploads/assets/file/dawokululaxesedivirafibuf.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_off000101fd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x101FD 16792 bytes
font_01_sfnt_off00011a14.bin
985fe1ec5014f5846a9e3c2ee6c2a775db3f66a822f78af4eabf2f0443bcb03b
pdf-font-stream PDF embedded font (sfnt) at offset 0x11A14 11280 bytes
font_02_sfnt_off00013477.bin
357fa68dc6793d19736cd7df0e633acb3121cbb599442d5a4a02dcc75f4d6776
pdf-font-stream PDF embedded font (sfnt) at offset 0x13477 18976 bytes