Malicious PDF — malware analysis report

Static analysis result for SHA-256 05fb6b8bf25ad5ea…

MALICIOUS

PDF

87.7 KB Created: 2021-07-16 14:06:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 02a0738d329bdb91bdf1bbfe9fd1a21c SHA-1: c67653607e9964a620d43fdb04f718efbaac8f8a SHA-256: 05fb6b8bf25ad5eae2fa87d450b0ddf85f43a652dee73660c1563e3626fae7ac
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting. The PDF structure and embedded URLs suggest it's designed to lure users to external malicious sites, likely for phishing or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://huntic.ru/uplcv?utm_term=manuale+damore+1
    • https://tangentemag.com/img/file/55850951901.pdf
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/fd7vte4vrithve3nuqn6nvi416/93897950617.pdf
    • http://soldresold.com/Shradhdha-Mehra/soldresold/final/ckeditorimage/files/6135650354.pdf
    • http://fly.no1-yes.com/userfiles/file/juripatufifuzifov.pdf
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ed6a11e1ebb---70438519204.pdf
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/ef1drucaa9s5t0gbeb0tkr32dr/viposefiposurimezemipi.pdf
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d6af219bf1---64535931372.pdf
    • https://orangerun.re/photo/files/sokawanirise.pdf
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2892dabc32---juwumudunosejupogo.pdf
    • http://greathorserider.com/ckfinder/userfiles/files/21349852290.pdf
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/dbfba27a59570225c3d3da43d8a5fd8a/lewakipelujafaror.pdf
    • https://steammining.com/userfiles/file/tanojeporarotoda.pdf
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160772e2892f6f---jabogedoxuzobo.pdf
    • https://airbays.com/userfiles/file/noserawotowivexewu.pdf
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae404d56e89---80577302257.pdf
    • http://auxerretv.com/content/public/file/57973462264.pdf
    • https://wfca-czech.cz/temp/userfiles/files/44500423376.pdf
    • https://otartufo.com/ckfinder/tartufofiles/files/63100180194.pdf
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/6694b922f441177429eb679cee48999c/bididebuna.pdf
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/311540ab0db14c878ab160e18d94c319/jajutomeju.pdf
    • http://boatmonies.com/uploads/files/36689497347.pdf
    • http://abwingssuffolk2.com/uploads/files/lebinilemewonop.pdf
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160847be2399ac---wesoxejix.pdf
    • https://mediaget.com/userfiles/files/tekidejometojixatotebodun.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_off0000f5d8.bin
66c9cce76fa40fac3dd411fd40e30489fb5dd356dc923551583e7d0cbc3ef0a6
pdf-font-stream PDF embedded font (sfnt) at offset 0xF5D8 10196 bytes
font_01_sfnt_off00010ca5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10CA5 16792 bytes
font_02_sfnt_off000124b7.bin
34b33960f3074997ada3f4e404ae76a513c5c936bcd0b4a760e431a8dc5eab86
pdf-font-stream PDF embedded font (sfnt) at offset 0x124B7 17516 bytes