Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3881deb9ceb8f29…

MALICIOUS

PDF

68.6 KB Created: 2021-09-25 14:04:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c56f73d23a5045f6dcd8965dffbb58c9 SHA-1: cac35de88da5cc21000ee588d83d8ae14695b52f SHA-256: d3881deb9ceb8f299978cd1b97deec018440c3c5b2fd0f2f6ba31116f50e2352
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://crewmak.ru/uplcv?utm_term=sims+multiplayer+android
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/59a2bedd84dfc9aa5c850240df87bf1f/junogolulineka.pdf
    • https://mujeresenmovimientoplus.com/userfiles/file/26622872967.pdf
    • http://ch-yang.com/upload/files/73948878150.pdf
    • http://koopmankennedyfeller.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/4611096864.pdf
    • http://kezmosas.hu/files/file/nojonimeveg.pdf
    • http://restokrat.info/userfiles/file/32247330844.pdf
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b00694215c---81185298154.pdf
    • http://bluekeydigital.com/images/pic/file/69875081179.pdf
    • http://chaireyes.com/v15/Upload/file/20219171552205963.pdf
    • https://trompis-tondschungel.de/userfiles/file/25050344727.pdf
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/50caa9afc4728cdd2e09a2b080cd59d1/podetakujoxelezolozaxuxa.pdf
    • http://wcsps.com.tw/ckfinder/userfiles/files/70172310029.pdf
    • http://batterseataxi.com/survey/userfiles/files/bawaliwig.pdf
    • http://sushinamu.com/uploads/files/29893473409.pdf
    • http://jeanthompson.nl/ckfinder/userfiles/files/digasedutajilab.pdf
    • https://ka-base.no/images_content/file/50448850229.pdf
    • http://eachfun.com/ckfinder/userfiles/site_eachfun_com/files/85426863995.pdf
    • https://mobilieroccasion.fr/uploads/file/48179025816.pdf
    • http://sz-nuoyi.com/Upload/file/2021091514141732945.pdf
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135a805c18ab---51870820171.pdf
    • http://888spirits.com/userfiles/file/mibosasuwikufa.pdf
    • http://hzjksj.com/images/upload/File/87922616837.pdf
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000acd4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xACD4 16792 bytes
font_01_sfnt_off0000c4eb.bin
dc111e5261264125418060116b7d61c8cbaa620d9355e545935ca2cf4be1d48e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC4EB 10840 bytes
font_02_sfnt_off0000dde6.bin
7ff7716be0a81c53efa7e20f31b1b9542344f8a406f58828b4c64c9dd00b916e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDDE6 15668 bytes

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