Malicious PDF — malware analysis report

Static analysis result for SHA-256 677b42d790e732f4…

MALICIOUS

PDF

90.6 KB Created: 2021-08-06 18:16:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 336af1bebdcc1dd212146c8b3074e34f SHA-1: 7cbf13c3c91576ab67cbc537c8b3b4480e3dcbfb SHA-256: 677b42d790e732f4d3f167f5f94da825db70facc7488989696c3179fdedadacf
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to websites hosted on compromised CMS platforms or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lead users to phishing or malware distribution sites. The primary function appears to be a link farm designed to obscure the true destination of the malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://run2endalz.org/clients/2/2b/2b4973775a35d8819257a28a16fdea67/File/dusokuxitexileviw.pdf
    • http://henri-ruch.ch/doc_pub/file/4119166369.pdf
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc5126e35e---demubukupurosobini.pdf
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609efd65cb22c---bitinu.pdf
    • http://poorclarescork.ie/images/vezelitabateforenejo.pdf
    • https://cmfnepal.org/userfiles/files/81367848969.pdf
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fdf0cc4399---xuwipuzifipusipa.pdf
    • https://webtechnocrats.com/upload/file/kereworo.pdf
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/iskokani3692bd6s853vthvv45/54151527952.pdf
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607c45b99166b---63178379214.pdf
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c99b9f0f15---65939199388.pdf
    • http://niestachow.pl/data/aktualnosci_imgs/file/32979961129.pdf
    • http://livelyway.com/ckfinder/userfiles/files/dibenelabajese.pdf
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad53c6321a0---81259533030.pdf
    • http://ros-grad.ru/fck_editor_files/files/50690023943.pdf
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/me1m5oh2poe116ltak6qh6gnt4/vaxizuxubedafivarilujuxot.pdf
    • https://lapalettedesarts.fr/gestion/file/radibewugakunuvobodofus.pdf
    • http://aven.su/userfiles/file/tufinolobaxegig.pdf
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607a33a4af789---lovikovaremuloxozok.pdf
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/sh4nm2jhf2eq34b54b271j476d/xexomoxaxamotuxivok.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=shiv+puran+sanskrit+hindi+pdf+download
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e67c.bin
f2666e95f4599b990980a0abf2f374fe3006e34437484733904d739abeeb93bf
pdf-font-stream PDF embedded font (sfnt) at offset 0xE67C 16228 bytes
font_01_sfnt_off0000fc60.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC60 16792 bytes
font_02_sfnt_off00011477.bin
1e2532a3fb28898a91530787f3fa57c28418d587101f452f0a61fd35d7aa7b9e
pdf-font-stream PDF embedded font (sfnt) at offset 0x11477 10880 bytes
font_03_sfnt_off00012d98.bin
01248565ce784ffa1310231125fa29513206638a8a2ffb336cc2fbf57fc764d1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12D98 17220 bytes