Malicious PDF — malware analysis report

Static analysis result for SHA-256 803422ea8e7b6455…

MALICIOUS

PDF

90.3 KB Created: 2021-07-03 20:21:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9933de15d26c8e7c54e38076b81515b8 SHA-1: 57884e45b025ca6d21ceca1cda33dcfc65885a98 SHA-256: 803422ea8e7b6455639cde1bc404d0a1f989f28304e196378ed235ab8f258153
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple distinct hosts, many of which appear to be compromised WordPress sites or disposable hosting. The primary purpose seems to be to redirect users to potentially malicious content or phishing sites.

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 http://wojno-stal.pl/pliki/file/xovalitilosifelapigu.pdf
    • http://markone-tools.com/upload/files/43955400104.pdf
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2fa3fc5228---46445558626.pdf
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/c04n17b9uv9t96vjchs9oihb61/19067797876.pdf
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/r9kt9f7lvvt026728psuh1k77n/jibofotiwaximikugefev.pdf
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/160789e44d20aa---wuzujam.pdf
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b684a2421b4---buzotafefisisokudezi.pdf
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/160954b2d00420---81988857731.pdf
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/74dda0899f970f43e350a1865ed4e4d9/43101444742.pdf
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/16095c1449470e---pezufadalupudosidonaji.pdf
    • http://archerelectricsupply.com/userfiles/file/33579178011.pdf
    • https://cottonweb.net/userfiles/file/35969173593.pdf
    • http://ligneus.hu/upload/file/nadejabuwojonomofurosi.pdf
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/hefoc3vv1reqpe903h39su5rq1/74801378826.pdf
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b61d6c3056e---dorar.pdf
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/6afc9d68634986a8614c5a177f1d7bef/nutus.pdf
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/aa6f17c6bec7aab0d76f6b1545187706/23834062614.pdf
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/16092b116b28fa---30532023907.pdf
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079a307eb076---14666558092.pdf
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/v5fs6mqei0iq8f8m93cjg2390h/5586309648.pdf
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608355cb48706---ginigo.pdf
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/e67dc4b89bda3bb88cc532cec7758c25/wifexijetowuduxa.pdf
    • http://massageindex.nl/images/uploads/tikogijapiziva.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=sex+and+answer
    • 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_off00010033.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10033 16792 bytes
font_01_sfnt_off00011845.bin
0c9fbfb52737d23ab67682b9c4f3959e6df50ae7dbf1b59fe4dce362a3a55546		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11845 17544 bytes
font_02_sfnt_off000145af.bin
b64f51f6beb0d217ef9c39f5f2702f4b928fddcb6d546cb74929b1d0abf33c0c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x145AF 10148 bytes

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