Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb046d960a32531c…

MALICIOUS

PDF

82.3 KB Created: 2021-08-23 11:34:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6f6e6e33dcadee9feb36f8f9dd9e679d SHA-1: efa58ee367a938c9448baf9663c56e14af4e1baa SHA-256: cb046d960a32531c9b4cd9cfe1d4d63a7d3adef7365507ddbe78391464f541b1
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous external links, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The primary attack pattern involves luring users to these external URLs, which likely host phishing content or further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://coretry.ru/uplcv?utm_term=shawn+booth+bachelor PDF link annotation
    • http://ferrogep99.hu/static/media/file/96363425000.pdfIn PDF document text
    • https://xn----8sbcehyodmtf1czh.xn--p1ai/userfiles/file/69962930091.pdfIn PDF document text
    • http://naucseto.cz/storage/lekajovoxajesenogowegi.pdfIn PDF document text
    • https://orldoc.ch/wp-content/plugins/super-forms/uploads/php/files/o8lq0ds7lshuda800sqpil1hk1/sedonok.pdfIn PDF document text
    • https://trvstore.com/userfiles/file/ravewexiwiguvifojedu.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/q016uh5nghgeb25kf81626jav1/tajidimobol.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/f40c49e30b1bbf63bbad015e7b833b85/7594321799.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a96d3e91d5c774ca11d5b3a20f589556/mavasesager.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/kkiqr09pa0rme8j6he058buah4/62939043853.pdfIn PDF document text
    • http://lesen-und-schenken.de/userfiles/files/taxidutariwukebivesitajoz.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099c138045bd---42654922498.pdfIn PDF document text
    • http://smartcevent.com/clients/871459/File/digoko.pdfIn PDF document text
    • http://goldnumber.info/userfiles/file/kusurozesum.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/c1c1428b153791378875499b7c81ba4d/loperetexoxixi.pdfIn PDF document text
    • http://lignumweb.com/site/webroot/uploads/files/luxamereruxetanatipazan.pdfIn PDF document text
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b46bfa1bb9---19044671452.pdfIn PDF document text
    • http://kag.fr/userfiles/file/nivagoru.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160842f16d33f7---gupob.pdfIn PDF document text
    • http://unipsyclinic.com/userfiles/file/20210510055022.pdfIn PDF document text
    • http://dissanna.com/temp/fckeditor/file/luvodipaxalufexuj.pdfIn PDF document text
    • http://dallapietamarchisio.it/userfiles/files/46899846991.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094912096f40---dijedalol.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bced05d2074---60503801060.pdfIn PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/f7b3f4f1671a8a9ff55185fff855fae0/gobepobanajetarazezifov.pdfIn PDF document text
    • 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_off0000ded1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDED1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f6e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6E8 10368 bytes
SHA-256: 39fb120c63771669a04e1508f8a99824d37c6a996ca71271a9fab21c9b0b5d04
font_02_sfnt_off00010e61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E61 17324 bytes
SHA-256: a41a94018f92075e164027d90de116729f983779b157cec9e8246df8ef0652ff

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