Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca9f8d438a8859e3…

MALICIOUS

PDF

80.0 KB Created: 2021-09-21 03:43:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ca619f0f5412400b8401fbb7ed3fcdf0 SHA-1: b394d764dcacb4e7f43f7aff848c527458fa2acd SHA-256: ca9f8d438a8859e35f2d56c850011276f77a4634ca6b8f32a34fddd75ac09aaa
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many embedded URLs pointing to compromised CMS upload directories. These links likely serve to obscure the true destination and evade basic detection, ultimately leading users to a malicious payload or phishing site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5466

Heuristics 5

  • 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
  • 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://thumpamonpally.com/userfiles/file/46816746362.pdf In PDF document text
    • https://mosaicopeoplecorporation.com/ckfinder/userfiles/files/kuviso.pdfIn PDF document text
    • http://christschoolblr.in/userfiles/file/sotogixofo.pdfIn PDF document text
    • https://infotechb2blite.com/bot/ckfinder/uf/files/xodazuzokuvodexekamedav.pdfIn PDF document text
    • http://jjsgreatescape.com/uploaded_files/userfiles/files/xoxavap.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/16138de2292700---vebubemimadawufisu.pdfIn PDF document text
    • http://giaydantuongphongngudep.com/images/news/file/89535503010.pdfIn PDF document text
    • http://olsztyntransportmedyczny.pl/userfiles/file/rogofekawu.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/208d1645682a8e9311d2e86fe9dc15db/tajemugoxiped.pdfIn PDF document text
    • http://jjkxmy.com/upload/files/202109201633267697.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140c08519334---95821209140.pdfIn PDF document text
    • https://widepolymers.com/userfiles/file/13100390635.pdfIn PDF document text
    • https://lenaoyunlar.com/calisma2/files/uploads/tupig.pdfIn PDF document text
    • http://markone-tools.com/upload/files/mubika.pdfIn PDF document text
    • http://simkoongschool.com/uploads/editer/files/15698594753.pdfIn PDF document text
    • http://sushimura1.com/uploads/files/ziwijoxemirelanikuxizima.pdfIn PDF document text
    • http://nktrading.qa/file/files/fagorojiriditu.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/197a147096beaf0799531754f2efd322/59281148201.pdfIn PDF document text
    • http://hanasushichoice.com/uploads/files/77046536043.pdfIn PDF document text
    • http://mrs-edu.com/sribati/editor/uploadfiles/4490722026.pdfIn PDF document text
    • http://mtegl.wsystem.sk/userfiles/files/gojeji.pdfIn PDF document text
    • http://eis-pieschel.de/UserFiles/File/19780570139.pdfIn PDF document text
    • http://pbhdom.eu/userfiles/file/89045607654.pdfIn PDF document text
    • http://saraya-shop.ru/upload/files/biseletebugotinaxosope.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d747ac57ba---rerigojifoligo.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/52c5a1ad696847d620f83449091f1d95/93233976883.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=position+time+graphs+and+velocity+time+graphsPDF link annotation
    • 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_off000101f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101F0 11144 bytes
SHA-256: 0753dcfbac7c279513e60c0e25ee6b7d121f73aa13571b6aaf1b9b287e0be751
font_01_sfnt_off00011b96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B96 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1