Malicious PDF — malware analysis report

Static analysis result for SHA-256 55cfad08f002e487…

MALICIOUS

PDF

88.7 KB Created: 2021-06-26 01:56:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: c76d51c3a677e3c9f86dda2852427192 SHA-1: 7761d7066ee3cd53e3a83bb6031c19eea5314574 SHA-256: 55cfad08f002e487e26e48696af4a322fb6cd2b86eb878a05ae885c8265f5acf
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous URLs pointing to various websites, including those hosted on compromised WordPress installations, suggesting an attempt to lure users to potentially malicious content or phishing pages. The use of `utm_term` parameters in some URLs indicates a potential SEO-based distribution strategy.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://irlanc.ru/uplcv?utm_term=pdf+reader+for+android+2.2 PDF link annotation
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/87ea859bda32ad3f335a8abad7af4d6a/lixozegaj.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/od4oo8s0o8dla87d1357562poo/nasorumeborofi.pdfIn PDF document text
    • https://ckmandarin.com/uploads/23297878126.pdfIn PDF document text
    • http://biurod9.pl/public/userfiles/file/78339308272.pdfIn PDF document text
    • http://ersatzmonitor.de/userfiles/file/2455701945.pdfIn PDF document text
    • http://www.darvidproperty.com/news/file/defawojuju.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a088108fb3e---vutogifisilafexijit.pdfIn PDF document text
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/e74209ead1399fb65291de47d9c75f43/87639544565.pdfIn PDF document text
    • http://wchs65.org/clients/b/bb/bb65574a37642f7fe3135935df861e67/File/23072425027.pdfIn PDF document text
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/160770ff0e4665---24406108913.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/o4mtosfhierjqn1m2r4qeqodfa/62698381228.pdfIn PDF document text
    • https://electrabicycles.pl/app/webroot/uploads/file/16219251308807.pdfIn PDF document text
    • https://xn--80aaijz0c.xn--p1ai/ckfinder/userfiles/files/32136407810.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/0b7524527c8efeb9727fce58706309ba/13713077694.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160b946a0d76bf---sexojotovamofejutelat.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/degulozinusetin.pdfIn PDF document text
    • http://www.bluewhaleline.com/image/upload/File/zavifagepujifosi.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16084e26b0a124---2539294051.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3e83666f83---99095207528.pdfIn PDF document text
    • https://gilbertems.com/videos/file/poroj.pdfIn PDF document text
    • https://nadamasristorante.it/file/mibovubomatabad.pdfIn PDF document text
    • https://hgb.se/filer/file/nekepebebosejaf.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/80ohl09jtf3guars8g1f1e2bb3/kejunubexudemijo.pdfIn PDF document text
    • 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_off0000f9e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9E2 10220 bytes
SHA-256: cf8ea828bc74cf589b59c6d95d637e717c018a98de89c253da8064cdf2912323
font_01_sfnt_off000110f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012904.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12904 17124 bytes
SHA-256: 82625ab8d03b4329390e5fcc562fc2ab105b9c1a682c8506e0414b44c1f1fc89

Open this report in the interactive analyzer, or submit your own file for analysis.