Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ebe41673a689fa8…

MALICIOUS

PDF

72.4 KB Created: 2021-09-02 12:29:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 0ad07f98616645114ef17a5a2c9d7155 SHA-1: b593b95675e2a456e53170cfbe6a4671cb1b5e43 SHA-256: 9ebe41673a689fa82ca3e52ce0a0062b01ff375caca47be7735b1f8f76012ad3
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://kstarsmall.net/userfiles/file///50911655831.pdf In PDF document text
    • http://ruegen-ferienhaus-schneider.de/userfiles/file/96781030070.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a677ecce66b---finojaf.pdfIn PDF document text
    • http://usmleworkout.com/files/file/newobabedesakazon.pdfIn PDF document text
    • http://evohome.pl/userfiles/file/76466251729.pdfIn PDF document text
    • http://drive4smilesquebec.com/clients/f/f5/f58105ca183540932673f5bf18e62671/File/96196617095.pdfIn PDF document text
    • http://kompassztuki.pl/Image/files/lapudosusuvopojafole.pdfIn PDF document text
    • http://oldadmin.k12cart.com/media/files/58104566007.pdfIn PDF document text
    • http://qca.ch/userfiles/file/50519007797.pdfIn PDF document text
    • http://russkiivopros.com/images/FCKeditor/file/30083948867.pdfIn PDF document text
    • http://sieuthihatgiong.vn/webroot/img/files/lepewasaxobex.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/ede9098d5e824db589bf72f97f70839f/siriwatoxaxij.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/85a69dfef6067b28ecb3c7b5ccb8f9e4/vulizinus.pdfIn PDF document text
    • https://travolution.travel/wp-content/plugins/super-forms/uploads/php/files/c509f96a556fa7ad31af9c0254f83431/livujalozetukebegan.pdfIn PDF document text
    • https://smartmedia.ro/app/webroot/files/userfiles/files/26843702254.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/pve3ghfknvmuri0l9phk6borp4/56014140182.pdfIn PDF document text
    • http://sushi-belovo.ru/files/68629935706.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/61ae9d0e9bb60bdfb694ffcfccc05b98/dadozojefagutulajas.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f4d22234d1---kaxarule.pdfIn PDF document text
    • http://dancedynamicsla.com/clients/38740/File/79755830204.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/pvt1rhoa2oag8d59lrh94efme3/30160298505.pdfIn PDF document text
    • http://smcertificationservices.com/userfiles/files/gebeloxozozu.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160d7ea0ec72fc---zakibumibutotu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=2004+chevy+trailblazer+ext+ls+manualPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b60a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB60A 17024 bytes
SHA-256: 4396b2edfa84ce05fe0f8a12a5a9db8f4b530e5779467f3c208f7e1bb395f90f
font_01_sfnt_off0000e220.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE220 11180 bytes
SHA-256: 90931967ed277380ab3b63338bf1d6cf4b634aca6dc192995b32aeb274a57182
font_02_sfnt_off0000fc41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC41 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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