Malicious PDF — malware analysis report

Static analysis result for SHA-256 81577e5695fb4974…

MALICIOUS

PDF

85.0 KB Created: 2021-08-25 07:25:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f204e1d61b437eb1fa4a11d54f808365 SHA-1: 82990e52b60ed9b850f12cf33efc87c12621521f SHA-256: 81577e5695fb4974d34a418221a435b7e606385560516ccc40930860d2dc2222
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware hosting sites. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f0563e7ffb---34336574821.pdf
    • https://buyafranchise.org/files/files/17065599543.pdf
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e7c6568a86d---57866243793.pdf
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/5782c5b94a830e7c4aefad48a9f7eb28/moxizubamojojude.pdf
    • http://oakgroveschoolheritage.com/clients/b/bc/bc5c94904a1f00f1300372e6f875146f/File/rubojopoduwokiwes.pdf
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b455042cc53---rasivakojobosejedodokevi.pdf
    • http://blissrenewbeauty.com/newerac2c/userfiles/file/xivegarokodeg.pdf
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16091da57208b5---ruvuvavugobafo.pdf
    • http://permanentnimakeup-brno.cz/userfiles/files/71542770555.pdf
    • http://www.hydro-tg.pro/upload/file/gapafurizilebijabokobaku.pdf
    • https://ktmcollege.org/public_html/userfiles/file/vokaguruxajurewaje.pdf
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/30756bcb4aee8f0679cba5f083c4c462/24607914223.pdf
    • http://sahamit.net/userfiles/file/pafasadebewejolawotu.pdf
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607982eda8e53---89425900921.pdf
    • http://rorolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/10734818317.pdf
    • http://cs-golfclub.com/ckupload/files/makebofewadozefironivu.pdf
    • https://brothers-music.com/ckfinder/userfiles/files/56027113840.pdf
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/33496b0cb7179d75864a857238bfaa2f/13987473794.pdf
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fbbf90cfa3---81126722789.pdf
    • https://bisnismedsos.com/userfiles/file/60630157253.pdf
    • http://michaelwilliamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nowojutufesonijamosi.pdf
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/f53fefce5094ea8865e534505b7abdda/48311741149.pdf
    • https://ncvpte.in/userfiles/file/87015539472.pdf
    • http://www.park-seversk.ru/other/js/ckfinder/userfiles/files/90598409418.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=2k18+download+android
    • 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_off0000eadc.bin
5e3ce6adf1daccdd4a07a705582ad3a41eb0ded84f925fac0f025983e901d58c
pdf-font-stream PDF embedded font (sfnt) at offset 0xEADC 10304 bytes
font_01_sfnt_off00010241.bin
f15ccc8aadbb84c8ae67758351532ef6edbd92b9e6b427b80b96f3fa3244c94a
pdf-font-stream PDF embedded font (sfnt) at offset 0x10241 16528 bytes
font_02_sfnt_off00012d06.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12D06 16792 bytes