Malicious PDF — malware analysis report

Static analysis result for SHA-256 438bc7a0959e6f86…

MALICIOUS

PDF

96.0 KB Created: 2021-10-05 21:34:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 436ad5e69c59ed1366c10fbd9bd3d448 SHA-1: aa86d5485d17c26c78c72156ea8ba8a7276bdcd0 SHA-256: 438bc7a0959e6f86f7cd858506f64b7831e1192fb5cf89df3b80626ebdf959c7
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which are hosted on compromised CMS uploads or disposable domains, indicating a link farm designed to redirect users to malicious content. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports a phishing or trojan distribution intent. The embedded JavaScript likely facilitates the redirection or further payload delivery.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3333

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.
  • 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
  • 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=2.4+real+zeros+of+polynomial+functions+homework PDF link annotation
    • https://adikkedua.com/contents/files/nasetudujijataxilefalar.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161469e5c7e122---fikufukolizebofuguzo.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/8ihjhnrekm1ctniaen9nh3hah0/35966755481.pdfIn PDF document text
    • https://cs-nippon-cp.com/mailmagazine/upload/files/gunezulaladilut.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/dawemiruvo.pdfIn PDF document text
    • http://tandartsindex.nl/images/uploads/51066059000.pdfIn PDF document text
    • https://digitaldaya.com/imagenes/file/lidujonesofunuvez.pdfIn PDF document text
    • http://mcutech.net/upload/2021/09/file/16327235701528975941.pdfIn PDF document text
    • http://tcgardening.com/userfiles/file/2021090722455273499.pdfIn PDF document text
    • http://lingeriedediva.com/UploadFile/file/2021092503541273499.pdfIn PDF document text
    • https://keiba-like.biz/js/ckfinder/userfiles/files/5175122454.pdfIn PDF document text
    • https://coolingrealestate.com/your-home-cleaner/FCKuploads/file/sodijobetifoxok.pdfIn PDF document text
    • http://princeworldwide.com/multimedia/userfiles/file/49156440707.pdfIn PDF document text
    • http://hepiran.com/cache/fck_files/file/vovodamadobigan.pdfIn PDF document text
    • http://sun-marche.com/app/webroot/js/ckfinder/userfiles/files/mimedofotimatilubovotufun.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16146b5f161054---19778701440.pdfIn PDF document text
    • http://ztkammer.at/uploads/file/15000906375.pdfIn PDF document text
    • http://kwiatmetal.pl/userfiles/file/xomuvejezafuxurilonabobew.pdfIn PDF document text
    • https://coastalholidayproperty.com/ckfinder/userfiles/files/dojidumanizovomevar.pdfIn PDF document text
    • http://telegid.tv/userfiles/file/43696696803.pdfIn PDF document text
    • http://ozt.zielonetarasy-cieplice.pl/uploads/userfiles/files/22176349912.pdfIn PDF document text
    • http://harringtonassociateslaw.com/Test/JabzMedicalBillingService/userfiles/file/70214026309.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012b8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B8F 11364 bytes
SHA-256: 3c7e7055737600dc2789d19cc748265d75886b357b8cedce12951c52a2c383ef
font_01_sfnt_off00014662.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14662 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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