Malicious PDF — malware analysis report

Static analysis result for SHA-256 243c254bbd9f0235…

MALICIOUS

PDF

89.5 KB Created: 2021-08-01 19:31:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e033430f7c502cd43595dd632ef725d3 SHA-1: 7b7146a059ea64fd8e74212e725bc1aa40c55c2d SHA-256: 243c254bbd9f023511943e6c13e964e0b27416763bb4cc41cf9b207029dccd94
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or IP addresses, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with techniques used to host malicious redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://www.smartfutureexpo.com/ckfinder/userfiles/files/71363687087.pdf
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/2be6fc105e3ed2f1f600801e6d62cb1c/toleganenig.pdf
    • http://tuttotop.com/userfiles/files/zubija.pdf
    • https://soudurelausiere.ca/upload/editor/file/tipezivunizunuz.pdf
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f13d244e42---tipib.pdf
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087489058bc7---lesiwemijimap.pdf
    • http://sns.hu/_user/file/52468505126.pdf
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f21424f580---wibatoz.pdf
    • http://salukool.ee/upload/userfiles/file/fuvoverebajokugojajufum.pdf
    • http://gloucesterclassof81.com/clients/23558/File/80074941128.pdf
    • https://noddy.nu/images/file/15396607577.pdf
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a184bc21539---muforimazutenapakipusuvi.pdf
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160c9d432c934c---15947087064.pdf
    • https://classicandcamper.co.uk/wp-content/plugins/super-forms/uploads/php/files/ksqtgmvgq3s6vsv9jma5g3cktv/rijabudapaxobelogi.pdf
    • http://myshopekerala.com/userfiles/file/dikavuzipujudojaraluma.pdf
    • https://salubrismd.com/wp-content/plugins/super-forms/uploads/php/files/3a237bfdd5849167c1bb56bb697815f7/59896589689.pdf
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/9658b560a338db755bec56b75da2d498/90145478488.pdf
    • http://ty-universe.com/image/files/20210722_213325.pdf
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/l4d5kvccqpr876ahe5692phhup/zabevoro.pdf
    • http://busankid.com/webfiles/board/file///tuxajevutodi.pdf
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/160c7770eb32d3---85331193854.pdf
    • http://wajl.net/img/file/2021768711.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=jerarquia+de+operaciones+con+fracciones+ejercicios+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_off0000fac1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFAC1 16792 bytes
font_01_sfnt_off000112d3.bin
11ca01740219855f197d61806b837574d0422936f5c48434cc090123883712c3
pdf-font-stream PDF embedded font (sfnt) at offset 0x112D3 17572 bytes
font_02_sfnt_off00013f10.bin
ff91adba825905d249e37203cd5ceab0dc91ce76cedfc6faeeb2a9dd03ae4859
pdf-font-stream PDF embedded font (sfnt) at offset 0x13F10 10836 bytes