Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c416caf33dcfd6b…

MALICIOUS

PDF

93.8 KB Created: 2021-06-28 05:20:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 06654651fd6ef5a0d0ac57ac15dfffaf SHA-1: 57f08aaea8dc82b19c54413bec684181366abca8 SHA-256: 9c416caf33dcfd6b3252eb25cbffe7409d3d4bf979cf4de71c1e56656933881f
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a phishing lure. It contains numerous links, including one pointing to a raw IP address, which likely lead to further malicious content or downloads. The presence of multiple compromised CMS upload links and link farms suggests a coordinated effort to distribute malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/00cad9c62b288d006bcd2cc2a1f444a3/zitarosiminezukikuwemuzek.pdf
    • https://www.enterpriselighting.com/wp-content/plugins/super-forms/uploads/php/files/2deab8688774ff727035323ab1a76092/84144480544.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160748d1c011ff---xatifofogilamejapojoxix.pdf
    • http://157.230.241.115/image/upload/File/27212969333.pdf
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bbb648b1a5---32810371386.pdf
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/9641a9c0af9a3c57808cc6ac6d7bfca1/82968358965.pdf
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160879ebb3234e---tapedoj.pdf
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/8c9eb35772ccbe428982623f2022b05c/6967142727.pdf
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607bd2779b530---47390699563.pdf
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c11d6122385---85158696412.pdf
    • http://varanini.pl/userfiles/file/94925410764.pdf
    • http://rittenhousereunion.com/clients/a/ad/ad7d26974070b67854a29702aed78614/File/mefoserib.pdf
    • http://coxfamilyreunions.com/clients/5/56/566bc9ad745482f371977770c3e6b383/File/6051419482.pdf
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b005df02ef4---19361541622.pdf
    • http://wasserburg.pl/userfiles/file/fagebilavago.pdf
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080346b5e087---75994948143.pdf
    • http://dfwarbitrator.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/7933366288.pdf
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1608c50cd93608---18805492073.pdf
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609891c016af3---lugaraf.pdf
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c99eb7905b---46075163298.pdf
    • http://baliretreatcenter.com/olabali_ci/media/images/newsfiles/47405844829.pdf
    • https://cambodiadriverservice.com/userfiles/file/46224818175.pdf
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608af469921ba---mukovosapunozenomo.pdf
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/59e7cd2dfc9f50cc4808a49b7588b218/61398437277.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=project+timeline+chart+template+excel
    • 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_off00010973.bin
0c1707293a3bd06d26e7f37c8cc70289958f63bf4351032ef30155e426553a25
pdf-font-stream PDF embedded font (sfnt) at offset 0x10973 17560 bytes
font_01_sfnt_off000137a5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x137A5 16792 bytes
font_02_sfnt_off00014fbc.bin
5180bf940833bf74d7221c19489a2120a4d7679c749380f0c09977905d5049ff
pdf-font-stream PDF embedded font (sfnt) at offset 0x14FBC 10704 bytes