Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccf2307a6a53997d…

MALICIOUS

PDF

80.0 KB Created: 2021-06-26 02:17:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d4f12a5dbfa5c59c920cb46b2b118647 SHA-1: 040ab706a6cd14c59ee4d620a817de5162eaf46f SHA-256: ccf2307a6a53997d5c248bb6c6b70494758fa8fda14f9d94aaa7877637cc55cf
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to compromised websites, specifically WordPress upload directories, suggesting it's part of a link farm designed to redirect users to malicious content. The PDF structure and link farm heuristic point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://southtours.com/wp-content/plugins/super-forms/uploads/php/files/2fku234tj0hegjjsk9v0ploble/zosilikoxoxirogalimegu.pdf
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/c3074b6fed8ebe15089e2f7c3e599eb0/10092597394.pdf
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607465747ea35---8511436120.pdf
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/39fda5efe5b90ced67afc32b79bc9d9f/lipunepo.pdf
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/ed9980921311dd02349294e1bbc612d8/rurolebadedodilaxanifeza.pdf
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098ba9b2eb3e---xuwasifix.pdf
    • https://www.varishastalari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160867755db5cf---sojezobaxokawotaxazapiga.pdf
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607952435f626---75957300494.pdf
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094684fd1105---rezirorugonomadejorat.pdf
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aa0999ae62e---mabubejogabijuxari.pdf
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/qo0dp2jqcmu3tlnpb4cd3o8c96/26443912067.pdf
    • https://www.northernillumination.com/wp-content/plugins/super-forms/uploads/php/files/b8f7610351d0b72f3c7ec3ab02cf96ce/nijunokiki.pdf
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/5g21n5sqk9edc0h2k27epgdfq2/32997640308.pdf
    • http://bestapp4u.com/admin/uploadedfiles/file/53127293125.pdf
    • https://eravukappalpalli.com/userfiles/file/puvojiratufika.pdf
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16070d9f573f93---newasezupunanajabedulob.pdf
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/mq2el9lqa3dnm6loptfim96vld/45517552806.pdf
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/16083db9eec5eb---paxaxuwuso.pdf
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/524d39a38a4e749f5ac0bcb219d6c767/81632872949.pdf
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f8f21d2b25---49066363795.pdf
    • http://eprdel.cz/userfiles/file/wusavewokegu.pdf
    • http://www.deco-interieure.com/userfiles/file/vujazododevaxazonarom.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=wheel+of+theodorus+projects
    • 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_off0000d7d8.bin
04e78017adeb4261e73d2caa87bea8c7d754b9304254a08dffb7684aa9aa55dd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD7D8 10584 bytes
font_01_sfnt_off0000f035.bin
ef0973d6fee8e04cec860c8505e5a0c11bdbcf0ef859df805d5f9688eed47f54		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF035 16468 bytes
font_02_sfnt_off00011ac2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11AC2 16792 bytes

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