Malicious PDF — malware analysis report

Static analysis result for SHA-256 6713b8b42445c010…

MALICIOUS

PDF

85.7 KB Created: 2021-06-30 03:32:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b9c857431fdc867ef50855a66621047f SHA-1: 393f885afb77d30e9cdba2554128cf376a0c518a SHA-256: 6713b8b42445c0105d7dae4175265026a2119721bc01cfe46d1c6d4063f97c91
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, identified by heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing. The document body is unreadable, but the link farm structure suggests a lure to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac2e3c15543---43151077617.pdf
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083e90fa0e07---89567180657.pdf
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2299eba03---gimufefevepo.pdf
    • http://africanhairbraidingsalon.com/userfiles/file/walatunofatorunenag.pdf
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160723977c1706---paguwabojalobezepiboneki.pdf
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160b863373b57b---figolag.pdf
    • https://aprilboya.com/userfiles/file/nurifaputojejufu.pdf
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc83c3353a---pitenebaroku.pdf
    • http://kasystemofkarate.com/clients/861259/File/zumaripapozuvalezafosika.pdf
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16092e1b5e5a15---witul.pdf
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/61ad97e3e4c0259d2daefd2db279d78c/gabijixemage.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607c028c8e6bf---zirusugarelezago.pdf
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/160883b4273087---midufusokitasaranut.pdf
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/154b811f0cbb3cdcec117488e8b0dd2f/42563485103.pdf
    • http://bannails.com/fckeditor_userfiles/file/kijesagedevibonujumetes.pdf
    • http://jingluo.net/uploadfiles/files/kalixabakuxikixinon.pdf
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160aa5c3cb555c---nifurutorapisedisuf.pdf
    • https://nabijdefossa.nl/upload/files/damajufij.pdf
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/7941af9f1a184dbf6d99f690e8c0798a/67450722953.pdf
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083c05587008---fizobopuruwi.pdf
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bcbb3195f36---22573429312.pdf
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/aolf030lbrqkues9bc1of1bvag/nokinokefifedirop.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=hate+love+thoughts
    • 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_off0000ef79.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF79 16792 bytes
font_01_sfnt_off0001078b.bin
78489076b1920d90160e02f1485b32223f6c8f204234a5ccf4e6741cfb3a33c0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1078B 16792 bytes
font_02_sfnt_off000132d8.bin
e816710ca968d7268107bb224340eaadc98506c87bf6f2e1078d50bd3f2f11ef		 pdf-font-stream PDF embedded font (sfnt) at offset 0x132D8 10248 bytes

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