Malicious PDF — malware analysis report

Static analysis result for SHA-256 91bbc6a1d87b2532…

MALICIOUS

PDF

80.9 KB Created: 2021-09-05 16:09:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 24d0a1cc27c76d8497c617b7ad39e5a1 SHA-1: 6c850c645b1a2b800e65e73321831b936ef10c3b SHA-256: 91bbc6a1d87b25320c6bcf9a0dbe00cd91f1ec146601407b4ce18937f2e94c27
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs that point to compromised WordPress sites and disposable hosting, suggesting it is used to distribute phishing content or second-stage malware. The presence of external URIs and link farm characteristics strongly suggests a malicious document designed to lure users to external malicious sites.

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://wastran.ru/uplcv?utm_term=using+greek+and+latin+prefixes+suffixes+and+roots+worksheet PDF link annotation
    • http://tc-antey.ru/uploads/files/pafizowukebazidukula.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/d2mrmcqbofn00vvqnahk562rdl/42492890579.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a06734e8de0---wejisesefoxuxolum.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/59aeae4a6b2c145cafe864479c94ea19/donezoludiwelutakimebinoj.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/90414ff9f42d36d15290de7c609fb76a/9477819395.pdfIn PDF document text
    • http://ahlhy.com/uploads/file/072151004545.pdfIn PDF document text
    • https://kaimano.it/file/zuxuwubemigu.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/fcedbcc6f8aa070840358e15d6e73a11/menoge.pdfIn PDF document text
    • http://hosungtour.net/FileData/ckfinder/files/20210826_5463DE562B216238.pdfIn PDF document text
    • https://pecsikult.hu/files/file/dapimoremugasuz.pdfIn PDF document text
    • http://przedszkolenisko.pl/userfiles/file/didulufodiwiped.pdfIn PDF document text
    • http://www.predia.cz/userfiles/file/guvonapudaba.pdfIn PDF document text
    • https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/bc9547d1831516cce5ea2b323b5fb050/58567133190.pdfIn PDF document text
    • http://surmounttravel.com/userfiles/files/91614352795.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/2t68vhnm2agk8hhtkk5d38b6f0/xogax.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afba01ac3e1---840149973.pdfIn PDF document text
    • http://tinavaron.com/ckfinder/userfiles/files/32260821901.pdfIn PDF document text
    • http://savitapiti.org/ckfinder/userfiles/files/sosenirok.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/5530840105.pdfIn PDF document text
    • http://chieusangducphat.com/uploads/userfiles/file/juzetikaseze.pdfIn PDF document text
    • https://betentour.com/sites/default/files/file/fegufowavefuroradafa.pdfIn PDF document text
    • http://okwecare.com/usr/userfiles/files/nimitopiw.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5150532b58---japulevuvet.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/e28105199f7d08102990bd24a3b3e411/zoxedupudiwokifotepozor.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_off0000d12c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD12C 11164 bytes
SHA-256: bd32761feee7bf12031d42d9c4aba890efdc45429c26c0647b33af07263efd14
font_01_sfnt_off0000eb18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB18 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001032a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1032A 18640 bytes
SHA-256: 219fdafdfa26b6a74754238788f6d79fce413d23d0dab0e2360f1fbd3df05af1

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