Malicious PDF — malware analysis report

Static analysis result for SHA-256 d68bcedb535154f4…

MALICIOUS

PDF

87.7 KB Created: 2021-07-06 22:21:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 5dc76f88ead15a2aba8fa017aab3cbc5 SHA-1: 3b29458a2ac3d7df06bfdeb71ab1469b49b8236e SHA-256: d68bcedb535154f4c03769f74cb5151cdf1bbc72c7e78e6ac229b0bb05d02a09
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, directing users to various external websites, many of which are hosted on compromised CMS uploads. The presence of numerous links and the nature of the heuristics suggest an attempt to lure users to malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://ntwbearing.com/UserFiles/File/61870356731.pdf In PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/d03d9bc77e94e43e7bf1e6f502d18ce0/55695164459.pdfIn PDF document text
    • https://www.northwoodmedical.ca/wp-content/plugins/super-forms/uploads/php/files/18a973qmvrcabarpejccgqiu98/38829082391.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/7339e62c772cfde8e955f69b6eeb632a/namava.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/s88i6ljhovs4bt7if1skk9qajm/kavudos.pdfIn PDF document text
    • https://seerupit.dk/assens/file/8552793385.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bceaf4a89c6---96435516508.pdfIn PDF document text
    • http://asfus.net/virgsurv/userfiles/file/14341957151.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/gkri7irap0ku6h1lhdg468gla9/pofinixidelapizogudixez.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ba4a2364bde---rojeraweditada.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607297ae87ced---demutofivodawenufawuza.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/5d50b35331934bdd15cbb9a853e1b642/wumoridu.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad9f483c32d---99638385547.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/i6fka753u9vm7ci48715c85o86/85193311622.pdfIn PDF document text
    • http://firmen-bekleidung.at/userfiles/file/7977853588.pdfIn PDF document text
    • https://whiteelephant.co.in/wp-content/plugins/super-forms/uploads/php/files/e1626424c4b50618bcc5c8319ad6cbdd/zafafevawosojitukop.pdfIn PDF document text
    • http://www.lugashotel.com/data/editorfile/31104494238.pdfIn PDF document text
    • https://angkalaris.com/contents//files/valon.pdfIn PDF document text
    • http://energo-market.ru/sadm_files/dilejuvapopakawo.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/h6gqriq7d56b9sor4fg0dumgu4/60197621303.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160af901ae4a97---22226951243.pdfIn PDF document text
    • http://www.startservis.sk/novy/ckfinder/userfiles/files/digebuzilufisodupupiwazil.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/16079a24c28a4b---65976718674.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/46867751334.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/74992103689.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=laura+whitmore+strictlyPDF 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_off0000f159.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF159 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001096b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1096B 17908 bytes
SHA-256: 862d922320ff4ad3d731b9b65fdf9e100deb769e2c336d7e333a75591fcefd5d
font_02_sfnt_off000137ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137CE 10648 bytes
SHA-256: 5fd3ee7df2153be626c28b9e8611478a387d1327dccb78789c39c269d5ddf2f3

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