Malicious PDF — malware analysis report

Static analysis result for SHA-256 63f62e644ca09069…

MALICIOUS

PDF

84.5 KB Created: 2021-07-05 20:08:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 395ca03d49f700c29b159402b038062f SHA-1: 3a2f7fc61f4b08a528f90873bb04e6998f917908 SHA-256: 63f62e644ca090692dccca1a9e7f6af79d1bcde55b36a39d855afa545ae64583
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting it's used to redirect users to malicious sites. The document body is unreadable, but the presence of numerous links to potentially compromised sites indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/7upe864899098kdbnvaiu4tki5/80700099410.pdf
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d1ccde4a0a---suxanawasat.pdf
    • https://autoprofi.ua/userfiles/file/28316397339.pdf
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160719fef3a35a---10728909592.pdf
    • https://mariellatriolo.it/public/file/68759558450.pdf
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aab87007b8f---56760482923.pdf
    • http://9meclinic.com/ckfinder/userfiles/files/dibafukutofib.pdf
    • http://smepil.com/ckeditor/userfiles/files/voxagoxuraka.pdf
    • http://aeronautike.com/userfiles/file/rozudusibekugutaxozaw.pdf
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/f65c1527aa357d68a9d4e570effa13bd/53406190883.pdf
    • http://xn--90aoj0agf7cq.xn--p1ai/uploads/files/18096579625.pdf
    • http://penzionnakrizankach.cz/ckfinder/userfiles/files/2258914813.pdf
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608af9a0c775d---bebotawanezunonodalogibum.pdf
    • http://netmutum.com/userfiles/file/rerelazaki.pdf
    • https://khangle.vn/uploads/images/files/kibupasexan.pdf
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160927e4766732---60504185408.pdf
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e39aad276f---luvaronega.pdf
    • http://yngc.ru/admin/ckfinder/userfiles/files/sekikaxusamaxu.pdf
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/e8948df0d857e3f9a4a92da710e145ae/dilogomixunumileluvakaf.pdf
    • https://anctools.com/ckfinder/userfiles/files/49703294613.pdf
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/01e8da5efb66f41b4f5b172ca7b116b5/18743576002.pdf
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16089c7911ca40---kovogebitowiboxixe.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=cooking+frozen+bacon
    • 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_off0000e77c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE77C 16792 bytes
font_01_sfnt_off0000ff8e.bin
9eccfd52fc5eeb513fe52179b9992a462aaec6109b1bbb253a3d424e972db9bf
pdf-font-stream PDF embedded font (sfnt) at offset 0xFF8E 17124 bytes
font_02_sfnt_off00012ba6.bin
35c43e97a30c1fecb442de5f44667fa29715607697a20884430b197d754109d5
pdf-font-stream PDF embedded font (sfnt) at offset 0x12BA6 10520 bytes