Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7743772d79dc07f…

MALICIOUS

PDF

73.4 KB Created: 2021-06-24 21:17:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 0c64f3c2afb1720af071b9d557935f21 SHA-1: 2c0ab8b18b9c787fa0666bb12cad3443155ea1a8 SHA-256: e7743772d79dc07fc81167c4e20f69ba09ec08f87235f43fcd4b4a3336a23d11
162 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and ML classifiers, indicating a phishing or trojan threat. It contains embedded JavaScript and a link farm pointing to compromised WordPress sites, likely serving as a lure to download further malicious content. The presence of embedded JavaScript suggests an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7662

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://ketchas.ru/uplcv?utm_term=dragon+ball+z+ultimate+tenkaichi+ppsspp+download PDF link annotation
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607681e04da43---43282200257.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/24daee54c35e1e8d87df909a7fe29fd5/tinanufunevago.pdfIn PDF document text
    • https://havanic.com/cache/fck_files/file/71003926499.pdfIn PDF document text
    • http://francisfamilyreunion.net/clients/870293/File/mavemesutoxibujuzelax.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075e30d3a300---68379542847.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16098a2fedf3dd---52254828659.pdfIn PDF document text
    • https://traonguoc.vn/wp-content/plugins/super-forms/uploads/php/files/8d9s8742ou8of11m3rf227g6b6/zazawijowaxa.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/38943930140.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a092e0ed609---kuzirunawubugu.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/raxijirowudekinezapobi.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608fbae52e7e2---13017950022.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075e88f20f7e---55633297869.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607853da19a0e---wibelobifokub.pdfIn PDF document text
    • http://writtenmail.com/upload_images/file/gekinorun.pdfIn PDF document text
    • http://garage-fuji.jp/js/upload/files/girowoni.pdfIn PDF document text
    • http://bidmitt.com/img/files/file/gisib.pdfIn PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/09fae7ca8db4eb249f5e96f9e59b7bf6/81154058357.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e7b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7B4 5340 bytes
SHA-256: 9905b0aa932cd3e10cd1bb72429e47edc952744f3eb3b91172e75c7d931bc74f
font_01_sfnt_off0000fa17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA17 5832 bytes
SHA-256: 69b84f275748f4614c32f2d3f61a9471a729a8ada614bf135c89659a54231ab7

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