Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9654fdfbe62db11…

MALICIOUS

PDF

68.8 KB Created: 2021-09-24 21:50:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 312efd3fba41e09814ff8fe7c2c9e60e SHA-1: 16f709dda364088f28ead23a1549ca344b9d3068 SHA-256: e9654fdfbe62db115c4e8ceb4e28b7a9e09c524fe16e0d0189f0ec4d860adf4c
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Numerous heuristics identified the PDF as a link farm, with many links pointing to compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs are likely used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://crysiq.ru/uplcv?utm_term=vpn+faster+download+apk
    • http://studio5r.com/userfiles/files/wifanemuba.pdf
    • http://around-sicily.net/userfiles/file/lilajopotaparowilaxanede.pdf
    • http://cpghollywood.com/userfiles/files/63490137873.pdf
    • http://files.ibiza-ferien.de/file/62868246353.pdf
    • http://johnlillylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kakemoduwariwawujudeguvo.pdf
    • http://hebammenglueck.de/ckfinder/userfiles/files/rimarixilabigagopepad.pdf
    • http://teifsepahan.com/files/file/puvabadatiweletazew.pdf
    • https://aprilboya.com/userfiles/file/diposamajixomazupevikez.pdf
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140c4a8b8fa8---66940132497.pdf
    • https://adurucui.com/ckfinder/files/927961066.pdf
    • https://blgjad.com/upload/files/winejemilavonuz.pdf
    • https://kozmetikadunakeszi.hu/userfiles/file/57304258173.pdf
    • https://cs-nippon-cp.com/mailmagazine/upload/files/turuloxewek.pdf
    • https://manage3.realtourvision.com/rtv/ckfinder/userfiles/images/files/76144046672.pdf
    • http://brilspa.ro/userfiles/file///pupugegoluto.pdf
    • http://hostingureitings.lv/uploads/userfiles/files/51947164313.pdf
    • https://inprovitecuador.com/ckfinder/userfiles/files/degusebez.pdf
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132683228d8f---20342142960.pdf
    • http://alituncer.net/userfiles/file/wurimufinotujegira.pdf
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161393d53a392d---lanawe.pdf
    • https://ksi-system.pl/editorfiles/file/bakutetepow.pdf
    • http://www.its-dph.cz/admin/fckeditor/editor/userfiles/file/kinosebofezipefemov.pdf
    • https://willes-gb.com/uploads/files/202109050401378564.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_off0000b085.bin
b72f9fce2a3864fa459e363fb0209bc7349ffb8731c34d319d082546a119a8d3
pdf-font-stream PDF embedded font (sfnt) at offset 0xB085 14564 bytes
font_01_sfnt_off0000d4f7.bin
0b3e0351daecc209ab70941c7e9aeef1f84ae39f7ffb32b5d973ef68ce61cb4e
pdf-font-stream PDF embedded font (sfnt) at offset 0xD4F7 10548 bytes
font_02_sfnt_off0000ed42.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xED42 16792 bytes