Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca18ce30be3560c3…

MALICIOUS

PDF

83.8 KB Created: 2021-08-16 20:36:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8cdca66db108fd23e0c0ae4e3fb033e2 SHA-1: 05beba68b121814eddb9a0a6fc3423e1d8d37861 SHA-256: ca18ce30be3560c32a68fb263a81536fe356ecdebe3a042ab142f59eeb6f94a4
184 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains embedded JavaScript and multiple external URIs, with one pointing to a raw IP address, suggesting it's designed to download and execute a secondary payload. The presence of a link farm on a potentially compromised WordPress site further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d66ac153f15---20868665217.pdf In PDF document text
    • http://tatugigo.com/ckfinder/userfiles/files/10012002137.pdfIn PDF document text
    • https://unicon-msk.ru/data/files/15991779278.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085d763abb44---bigosifa.pdfIn PDF document text
    • https://evpersoneli.net/ev-personeli/file/20217798947.pdfIn PDF document text
    • https://misionesmedellin2030.com/wp-content/plugins/super-forms/uploads/php/files/utj1enjrpsc9sdj5pv056gouis/tapatobapupedekizobojadi.pdfIn PDF document text
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/64a543ee97ce7a6d58170d4cce0e597a/doraxubazevejilugaxuboro.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/nrq7lf5ug5lv6b0kqc60rrh0q5/wenubimepolinemibivo.pdfIn PDF document text
    • http://reikihaus.com/clients/75291/File/sokezixunu.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/160863a4210ac5---simasagexerizunefe.pdfIn PDF document text
    • http://www.novosib-sport.ru/ckfinder/userfiles/files/warijebanimofetarobitanag.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc8eb11586---vawewowamuzalumelipa.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/ec5ff09ac0a898ed10caf69e053be0af/94440420474.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/d5e7a0fba2d9c9a67ab819f62b78c5f2/26002012064.pdfIn PDF document text
    • https://landbondcorten.com/attachment/file/04536ac06b0a7e3827ab03a146f7e6f5.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/62f66a57dc94ae0261667e94f457e63a/jojivafapalezukemuxirike.pdfIn PDF document text
    • https://777mto.com/contents//files/59035920216.pdfIn PDF document text
    • http://luingpyrex.cz/foto/Image/file/sakelokujim.pdfIn PDF document text
    • https://snpwachq.com/files/js/ckfinder/userfiles/files/weragamin.pdfIn PDF document text
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/4a62267d9e85245adc91dd074dc5d4aa/36897118480.pdfIn PDF document text
    • https://airshow-bg.com/file/logijikabidazepamupudoj.pdfIn PDF document text
    • http://talcmanagement.com/uploaded_files/userfiles/files/58129279119.pdfIn PDF document text
    • http://bumsnab.ru/uploads/files/moputikapidi.pdfIn PDF document text
    • http://wignaccent.com/FCKeditor_2.6.3/userimages/file/20210717192258.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef90c8a37c---sefofi.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/16092a7c79e17c---47979854692.pdfPDF link annotation
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=fast+and+furious+8+full+movie+in+hindi+download+1080p+filmyzillaPDF 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_off0000e0c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f8de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8DE 11548 bytes
SHA-256: cffc200dccfdd6695201c19ea26beba1c6d150889247d98527014ff99626c17c
font_02_sfnt_off0001142b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1142B 16940 bytes
SHA-256: 02bf84d6959c4af65a90725858ec62277f10e0154f2b6a79d9a143e6886d1993

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