Malicious PDF — malware analysis report

Static analysis result for SHA-256 244f367e53295731…

MALICIOUS

PDF

81.1 KB Created: 2021-09-12 02:46:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5292dca535f73ab3e83875425c59710d SHA-1: 6510ea1e8114c7863761080d44ed90689027ea64 SHA-256: 244f367e532957315592c02ff2a84960b5d450bf059fa8b72652f3d21388ae8a
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised websites and disposable hosting, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious content or exploit vulnerabilities. No scripts were extracted, but the structure and URL patterns are consistent with malware distribution or phishing campaigns.

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 http://klientskazona.radeton.sk/ckfinder/userfiles/files/84545709735.pdf In PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613b89ab654bb---xisolibajefimekapon.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/0943abd094404dda9cbbe6e32d44312c/74249987091.pdfIn PDF document text
    • https://karpzbeldowa.pl/uploads/userfiles/files/89195101384.pdfIn PDF document text
    • http://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.net/ckfinder/userfiles/files/tidoru.pdfIn PDF document text
    • https://vinadesigndanang.vn/uploads/image/files/pexikovoxi.pdfIn PDF document text
    • http://esistore.com/userfiles/file/kapudabinidekug.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/qfuimok4kolthnfi089a1e0st6/54511947554.pdfIn PDF document text
    • http://gro-felix.si/uploads/jixolonoxam.pdfIn PDF document text
    • http://derkwoo.com/upload/editor/files/64654529456.pdfIn PDF document text
    • http://tongchangkj.com/uploadfile/file///2021090608574055.pdfIn PDF document text
    • http://grandinhr.eu/images/user/file/9438337778.pdfIn PDF document text
    • http://6nergy.fr/6nergy/sites/default/user/file/favejefosutafedi.pdfIn PDF document text
    • http://schoonhovensvrouwenkoor.nl/ckfinder/userfiles/files/durumapuwo.pdfIn PDF document text
    • https://www.vasutaszeneiskola.hu/ckfinder/userfiles/files/nabiwijebomekurigiwidatip.pdfIn PDF document text
    • https://a-guskov.ru/uploads/files/rufefe.pdfIn PDF document text
    • https://godparents4tz.org/home/god/public_html/ckfinder/userfiles/files/depavekega.pdfIn PDF document text
    • https://austdoorcaocap.com/upload/files/vumer.pdfIn PDF document text
    • http://partnerplus30.ru/images/fornews/files/pativovisujisexunanejozu.pdfIn PDF document text
    • http://sziszolg.hu/editor_up/wamiridavobomifigo.pdfIn PDF document text
    • http://stilna-ya.com/_userfiles/file/fasisugukodesu.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138b5a60cc39---jekeribonedujalut.pdfIn PDF document text
    • http://pnalog.ru/images/file/vapelupekuf.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135955a991a9---10331258417.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=john+mcmurry+organic+chemistry+9th+edition+solutions+manual+pdfPDF 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_off0000d49f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD49F 11440 bytes
SHA-256: 4d9922ae7ff27cf987ab65c408f60e70cea6dd19498490edcbadd890c6fd1dfa
font_01_sfnt_off0000ef50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF50 17948 bytes
SHA-256: 509a009714cbf710cddc39eec666d4e32dec7574a1e0b40fe3e1625ccb528752
font_02_sfnt_off00011d7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D7F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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