Malicious PDF — malware analysis report

Static analysis result for SHA-256 72226cedf5488d25…

MALICIOUS

PDF

78.7 KB Created: 2021-09-18 13:17:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: d813e23d8200ca32f1d0a6d19f0d76c6 SHA-1: cf0daa03e8de0df0e4e6920cacb64522b54cf428 SHA-256: 72226cedf5488d25163f25731315fa228ee4b8c26669155c80de967fd59d7ea1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous external URIs and link farm patterns, suggesting it is designed to redirect users to potentially harmful websites. The presence of compromised CMS upload links further indicates a malicious intent to host or distribute further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://garglob.ru/uplcv?utm_term=play+store+games+install+free PDF link annotation
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131e1fd9cc3b---14799002654.pdfIn PDF document text
    • http://seattlebestteriyaki.com/uploads/files/52478586374.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/929e7ea64a1eb1305bbfedf3c0259517/lewefamamisotagu.pdfIn PDF document text
    • http://kibunajcc.com/ckfinder/userfiles/files/88664241139.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/fa5e58aa0302088edc8f60826dccfbea/nokomeda.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614252dc8930e---75943382993.pdfIn PDF document text
    • http://tele-klass.ru/i/upload/files/5031544698.pdfIn PDF document text
    • http://gt-outillages.fr/ressource/site-image/files/1886642227.pdfIn PDF document text
    • https://maconlux.lu/userfiles/files/6033185269.pdfIn PDF document text
    • http://piri-piri.pl/ckfinder/userfiles/files/23140805127.pdfIn PDF document text
    • http://tcihk.com/userfiles/1522370367.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16131f50f01145---wixudevumajukozazibeponi.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/edd0c4b94d8ffbb65c83cd532389b319/1595206254.pdfIn PDF document text
    • http://gccde.com/downloads/blog/geust/files/72388020337.pdfIn PDF document text
    • https://rosanaalvarracin.com/userfiles/file/58186974030.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c06935569a---15333710874.pdfIn PDF document text
    • http://www.fishandcosolicitors.com/uploads/files/74227066840.pdfIn PDF document text
    • http://bn-biz.com/userData/board/file/96127926517.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613cd019def0b---kagimiwifiwogurarasi.pdfIn PDF document text
    • http://resurrection-life.net/userfiles/files/boreligavebufazejof.pdfIn PDF document text
    • https://bilegt.mn/userfiles/files/xevug.pdfIn PDF document text
    • https://pchome.uzai.ca/upload/files/13296003407.pdfIn PDF document text
    • https://thehouseproduction.net/file/90942114171.pdfIn PDF document text
    • http://www.sloepverhuur-debiesbosch.nl/upload/files/senuxevo.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cdf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDF6 18000 bytes
SHA-256: 13418c84bf49bcfa53c500671ad09cc223c52047fae950bc671a370b14f33d92
font_01_sfnt_off0000fc90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC90 10672 bytes
SHA-256: 91c0fe47eac24e9a21782182b6323420a6aa93e1206695e4749c404fc8950ac5
font_02_sfnt_off00011518.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11518 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1