Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cc05ee82e2c5829…

MALICIOUS

PDF

87.9 KB Created: 2021-06-28 23:14:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 35d90c1b3068995954ea9f29c49733d0 SHA-1: 841e7646de177dfacdbad80dc6cb4ecde1b27dbb SHA-256: 7cc05ee82e2c5829ab7c5d73aae278f451864d5d58cec199b9051948de47acec
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious. Heuristics indicate it functions as a link farm, pointing to multiple distinct hosts, many of which are associated with compromised CMS uploads or disposable hosting. The embedded URLs suggest an attempt to lure users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/8f591dd6ebde79e0705e70b6d87b3c1b/fonajajubaxilored.pdf
    • http://dermaktif.com/imgup/file/28620020047.pdf
    • http://phantasos.org/userfiles/file/zozalaluzurozerurovalig.pdf
    • https://rsun.pro/admin/ckfinder/userfiles/files/fisasak.pdf
    • http://www.annaleehuber.com/content_files/file/vosemipetijodowaguseluf.pdf
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdd7ac311c0---mavuxasapodubaf.pdf
    • http://cartonwrappingmachine.com/userfiles/file/banimoxegojoxovuwagod.pdf
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b79f20b52e6---30254635201.pdf
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/f17b0ddae93c867f1a0c54beb1d851a8/65419811326.pdf
    • http://ccswcd.com/userfiles/file/wesisetirum.pdf
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/4j8v6gor8mmca9h3u3t2jgbbpi/96241602351.pdf
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/4c6128defc9a03711ab2ee3cd1df3a33/ximajodifuwewimuj.pdf
    • http://baloneacessorios.com/_upload/file///55053820322.pdf
    • http://ahchala.com/img/file/92931561321.pdf
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1606d81cc58b91---zafifupotisesizixa.pdf
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/a134719acaa5b8ddf6a34fec4ce19aa4/zelowuwinojekeduni.pdf
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160acc82ea98bd---16107816458.pdf
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/5b41n6dunbb68081fk6nt5ok99/tijim.pdf
    • https://aplusadvance.com/naver_editor/data/file/mixarujituxibomevenaxipas.pdf
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/3be00005c8f4b436ca996e790d89f494/mopet.pdf
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/7d832fd21890d1281ce30f4d369c3b7f/31982623636.pdf
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160877c2761f1c---46621462942.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=probably+meaning+in+english
    • 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_off0000f47b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF47B 16792 bytes
font_01_sfnt_off00010c8d.bin
a21c023976e4e17f329cb2bd51bb804bb13bb8af79e71fde0facd403793b710d
pdf-font-stream PDF embedded font (sfnt) at offset 0x10C8D 17964 bytes
font_02_sfnt_off00013a1d.bin
9b22dbb6d03ffd6098961cf3a822215604b99ec9b890fbb38d448980295a3244
pdf-font-stream PDF embedded font (sfnt) at offset 0x13A1D 10712 bytes