Malicious PDF — malware analysis report

Static analysis result for SHA-256 73d3c150ed3f5d6a…

MALICIOUS

PDF

89.5 KB Created: 2021-07-26 12:56:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1860c4c498179ecbdc1a976d2bb6f4bd SHA-1: 20ac7ff2d2d0aa6804c78dc0145c5c3e1fbe5182 SHA-256: 73d3c150ed3f5d6aeef68dd1cc8c16c34ee6629061ab9ce621e5d81583427d7d
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high probability of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised websites, likely serving as a distribution point for phishing or malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, suggesting the document is designed to leverage disposable hosting for malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/qnvovv4nskikmmpbcbupt00hu3/412556867.pdf In PDF document text
    • http://eluvial.com/sites/all/sites/eluvial.com/files/85209350528.pdfIn PDF document text
    • http://prunay-en-yvelines.fr/ckfinder/userfiles/files/besefebutivawosemogu.pdfIn PDF document text
    • http://ghrnightinwhite.com/clients/7/72/721f26fb9237119891afe8d29dbdfc29/File/88670221605.pdfIn PDF document text
    • http://xn--90aoj0agf7cq.xn--p1ai/uploads/files/rawuwapimewiduz.pdfIn PDF document text
    • http://artospace.com/pics/file/71859581815.pdfIn PDF document text
    • http://sacoorhealth.pt/site/upload/file/gunezotiwefoluzidaniredi.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/f9dacc404e0be8c61f68a28d3f078f00/janumowuzo.pdfIn PDF document text
    • http://rts-3.ru/upload/files/zovuteminebezur.pdfIn PDF document text
    • http://przychodnia-felinskiego.pl/uploads/editor/file/nudubisalode.pdfIn PDF document text
    • http://abnicum.com/files/file/xigusutorovipenuda.pdfIn PDF document text
    • http://sbhs1967.com/clients/8/89/8985ce50e7417da620f75e2af787291b/File/kixejogu.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b24818a0292---niten.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/df0bbacde62abf1d89293057ad342ada/vemiteposuxap.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/ec858d9ffa7f05377ffea5f958cc7c4a/84014104336.pdfIn PDF document text
    • http://aldara-latinoamerica.com/userfiles/file/24123320311.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/16098532e2b36a---nakobi.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a753d64a338---1927748368.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a212a91778f---ruwegiku.pdfIn PDF document text
    • http://erfaspot.com/resimler/files/vovedivawu.pdfIn PDF document text
    • http://zjpjxt.cn/upload/uploadfile/file/10210142496.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/160881d032c497---vuwesaralexolotoxisakiwi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=accents+francais+sur+clavier+qwerty+macPDF 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_off0000ec29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC29 10868 bytes
SHA-256: 755c3d1d69b76882da2bf6fb82913623dae9eccf2d697673d41ae622c36baa94
font_01_sfnt_off00010565.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10565 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D77 23220 bytes
SHA-256: de472fe4fc9e9d46ae97e50d0a1efdf611fe352a4fe2eeabc42e4e535279d869

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