Malicious PDF — malware analysis report

Static analysis result for SHA-256 60e8c764f560e89b…

MALICIOUS

PDF

90.2 KB Created: 2021-08-18 13:04:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8ff4e6a9c3b1553e2f25d185e033c723 SHA-1: e8dfe17bf0e01b3f05da207fa1b962213cb5bb5d SHA-256: 60e8c764f560e89bfe62607b19b755af363c5b4132d6106e74aa6fc51f7a9690
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. The file contains a link farm pointing to numerous URLs, many hosted on compromised CMS uploads, suggesting an attempt to distribute malicious content or engage in SEO poisoning. The presence of external URIs and a link farm structure points towards a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://philabc.ru/uplcv?utm_term=thompson+%26+thompson+genetics+in+medicine+8th+edition+pdf+download PDF link annotation
    • https://4cmedica.com/ficheiros_upload/file/nitizepimokatogug.pdfIn PDF document text
    • https://ottopianos.nl/files/71776087213.pdfIn PDF document text
    • http://geotersrl.it/file/rukedafazasifisuve.pdfIn PDF document text
    • http://philipwillettelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/74989575484.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/gcmf1gq4ks95l5eptjjminfjf3/61224801953.pdfIn PDF document text
    • http://changju-hotel.com/CKEdit/upload/files/41183070156.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a872726e4a5---13952022852.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1607cd7b3b4a0b---popuzepuguse.pdfIn PDF document text
    • http://studiorumeo.it/userfiles/files/42921516924.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160fa736f15562---bunudetilobisapiluzugofux.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/nolukaj.pdfIn PDF document text
    • https://www.zochrot.org/ckfinder/userfiles/files/wuborugakex.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160ee5aee5ba5f---riwudogulipamifetuj.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/uuog1qho68u4knt0p4o8s7c4l4/95274824290.pdfIn PDF document text
    • http://atletika-pardubice.cz/files/file/71516454110.pdfIn PDF document text
    • http://vector-luczak.pl/new/fck_user_files/file/vaguvoxifikesitej.pdfIn PDF document text
    • http://www.lnk-creation.fr/upload/file/83429774212.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/ea3b98dc8dffe0611ecec14233272e3c/25437792748.pdfIn PDF document text
    • http://studiotipaldo.com/userfiles/files/pedasowuxanomuweladiwi.pdfIn PDF document text
    • https://hophamthaibinh.com/upload/files/62071293049.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e78e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE78E 9844 bytes
SHA-256: 5cc6d15c79b18aa8f74a1f84686e0617701ff0931c80b5666cf58db8b6080d42
font_01_sfnt_off0000fce6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCE6 16888 bytes
SHA-256: a16304c3eeb56c7b94ab21df77dc653f15f1ba58689128585432222c7ff45245
font_02_sfnt_off000114f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114F2 17644 bytes
SHA-256: ef24803dade5d9636750f3707ccf26d5d73c9aad798e722a3231b8322d8651ea
font_03_sfnt_off00014318.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14318 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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