Malicious PDF — malware analysis report

Static analysis result for SHA-256 635b22428a62e601…

MALICIOUS

PDF

88.7 KB Created: 2021-07-23 06:25:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 080271edb18046bbe67b6cb5d2d0eaf9 SHA-1: 5801c12b80b2f27cc85d0c93ce09ef2b46417d77 SHA-256: 635b22428a62e601dd7a83cdefc97296ad6ff8e695ea2bbfda27078d809c080d
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF document was flagged by ML classifiers and ClamAV as malicious. It contains a social engineering lure, instructing the user to install a browser extension or update, which is a common method for credential theft or malware delivery. The document also hosts numerous links on compromised or disposable domains, suggesting it is part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/nvc35s5g68td3rn7gdensak7i4/mapugenukaboruvidedug.pdf In PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/de367bca60274406267e9706cdc5bcf3/tekasifeluduxinu.pdfIn PDF document text
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/066fecde0b418ab3acab0b5d969b3346/junevatilagafizumigukax.pdfIn PDF document text
    • http://yasairamenbar.com/uploads/files/gazopizi.pdfIn PDF document text
    • http://oprandi.it/userfiles/files/fosatisagexeka.pdfIn PDF document text
    • http://sweden2020reunion.com/clients/e/e2/e2375cbe45a1e08e95d3a39ca41e84e3/File/sopanosibor.pdfIn PDF document text
    • https://ebooksweb.net/files/file/87718904804.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/35d76413f312e5191deaf76150c5fce2/84946520449.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac70f584da7---27522756854.pdfIn PDF document text
    • http://maximaviajes.com/FCKfiles/file/wolaluxoroni.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609d95a051da0---34215905836.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/a2al0836mduh2l0o7vfeae36mi/fabumijoxofuruwijodix.pdfIn PDF document text
    • https://xlspandoek.nl/userfiles/file/wukeziwelekex.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/252d1ae6cf67b3356de85d32c5a28d3f/58841441023.pdfIn PDF document text
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/gapipurenofogedivi.pdfIn PDF document text
    • http://villapellegrino.it/userfiles/files/tabus.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/7991b0f0f3506703d8702213944727ef/vogikigexuwasipuvur.pdfIn PDF document text
    • http://circolosilverblufitnessclub.eu/userfiles/files/varitogi.pdfIn PDF document text
    • https://doktor-ara.com/userfiles/files/radatilovutuge.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d5476044c5---91709196687.pdfIn PDF document text
    • https://cochleartudaskozpont.hu/files/muwogewiligefi.pdfIn PDF document text
    • http://www.makattakasinti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084b1200d215---15389703876.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd7cb182119---2884803914.pdfIn PDF document text
    • http://vksraja.in/fckeditor/upload/file/nibujumamuxiz.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/altjvte5de4us27789piiltos7/41097628175.pdfIn PDF document text
    • http://tryinvest.eu/userfiles/files/723165876.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=expendables+3+mx+playerPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f59f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF59F 10756 bytes
SHA-256: 7e7ad9d3c0f1b2ed5e2ae26a6e62187a29a0c05f37cf1cb57f53fe1b1e226d11
font_01_sfnt_off00010e24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E24 17248 bytes
SHA-256: 64e3fefbb35ca99a14c209c9499ccb198f0b876c09b43b5c34ff3462615898ac
font_02_sfnt_off00013ba3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BA3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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