Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc35fd4f24173945…

MALICIOUS

PDF

80.4 KB Created: 2021-09-02 03:58:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ec458cdae0a1061febfbe4617a8115ab SHA-1: 59cf0005f3612fe39d95f282ebee5f1b49eee10e SHA-256: cc35fd4f2417394581a600694468dc922cd62ae91ac4466e8e44f15781412de9
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous unknown domains, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of multiple PDF link farm heuristics suggests a deliberate attempt to obscure the final destination and potentially evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4f345145f9---wokuvajisige.pdf In PDF document text
    • http://bjaimama.com/data/upload/2021/05/file/202105100406575973.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/55739235979.pdfIn PDF document text
    • https://fullmagicweekend.com/ckfinder/userfiles/files/4486679206.pdfIn PDF document text
    • http://ttccid.com/userfiles/file/jimimipuwujaju.pdfIn PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/ojnjhkhfgbpaobv5odvj1f35a0/tifunibeni.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608dbdfb2f4ac---71220978548.pdfIn PDF document text
    • http://uro-medical.pl/zdjecia/fotki/file/ganatuwi.pdfIn PDF document text
    • http://profil-metall.de/content/uploads/file/demakakukabupelajo.pdfIn PDF document text
    • https://ksmt.edu.np/assets/ckfinder/userfiles/files/96782395600.pdfIn PDF document text
    • https://copperscraphandlers.com/ckfinder/userfiles/files/60814483818.pdfIn PDF document text
    • http://lapenya.cat/imgjovesnaves/file/kodosidixavuritixalonowe.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161227295027fd---60550270291.pdfIn PDF document text
    • https://turismopontevedra.com/ckfinder/userfiles/files/tivagibiwufineso.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/a9glo8hjrc3jiv4jv02da3mic6/magemu.pdfIn PDF document text
    • http://gokea.org/upload/editor/files/fagunawuperivesegagakev.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/8fb21e9f1c47e934a71ff84b245e2a36/firuputupexuxaxiteju.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/2f62405a2a775390bf4b08ea44ecd886/noxegu.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/c03017688f899e83dae082cf0de87cad/41232751718.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ba7f418ec6b---97291458731.pdfIn PDF document text
    • https://www.truegridpaver.com/wp-content/plugins/super-forms/uploads/php/files/c19c92370c24480a1f7a96e085431569/wedadabukijikemomojatiku.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=if+all+airbags+deploy+is+the+car+totaledPDF 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_off0000d6fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6FB 11000 bytes
SHA-256: 6b1cd7d7f6d64cbcf0aeda4b29330312bd997375e7dbf2a6b1e9d45a4a621a44
font_01_sfnt_off0000f03c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF03C 17020 bytes
SHA-256: 647989d4346cd83b7a9ee63ee46c7392dad5102fa5805d8c339d055d2d0b1690
font_02_sfnt_off00011c25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C25 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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