Malicious PDF — malware analysis report

Static analysis result for SHA-256 b06e85b951467419…

MALICIOUS

PDF

100.0 KB Created: 2021-07-06 21:28:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: aed97d9325a32cffa0fb84c6fc971da7 SHA-1: 610da1f36ee924424ae32b607dd26c9a81f7f433 SHA-256: b06e85b95146741977ba75880fa6da2709a93af06fedf31f201e3aea1e832940
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites, likely intended to lure users into downloading further malicious content or visiting phishing pages. The presence of multiple compromised CMS upload links suggests a coordinated effort to distribute malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606ffb5500e53---8111433321.pdf In PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160bf8c4683bff---90252891628.pdfIn PDF document text
    • http://turskazka.ru/ckfinder/userfiles/files/12669186595.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/rbsgfvhaub0avlo7nm79jk9hgo/losasuxazuvumerenube.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085e8da771a9---66894864405.pdfIn PDF document text
    • http://chargers68-50th.com/clients/3/3d/3dd154274af4887fbe356f6dcfc18689/File/50032289010.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/ci31o43jk408hgm1q6fl89vaq4/87009520685.pdfIn PDF document text
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/451fc818ec386021c79c9bf4403ed0ad/wiwilifurepefez.pdfIn PDF document text
    • http://mobydick-band.de/fckdata/file/41064641517.pdfIn PDF document text
    • http://vejwun.cz/images/47145783612.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/8u73hp47nf4mt3rk004mdd7f7l/2616455552.pdfIn PDF document text
    • http://graylegalservices.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/59808535762.pdfIn PDF document text
    • http://www.makattakasinti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d84565d9a4---78006192051.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a5aa873b440---31354093226.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/qpc9vecrvogi5ium3e18so3i01/tijivebosifatilog.pdfIn PDF document text
    • http://szkolka-wiercioch.pl/files/file/97940118714.pdfIn PDF document text
    • http://chothuexehochiminh.com/userfiles/file/76326151911.pdfIn PDF document text
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/ghaes54ts1v6odp9gm53l4p5jm/ranuwowanego.pdfIn PDF document text
    • http://hvpeds.com/upload/contents/file/67296319747.pdfIn PDF document text
    • https://usssecuritate.ro/userfiles/file/13898789347.pdfIn PDF document text
    • https://solidpractise.com/files/userfiles/file/54327650549.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd7c829797---76356815189.pdfIn PDF document text
    • https://mangonebike.com/uploads/file/17500696529.pdfIn PDF document text
    • https://dannysacademy.com/ckfinder/userfiles/files/mapugafowazobuvulenip.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=frankenstein+chapter+6+quotesPDF 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_off000123d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123D6 17740 bytes
SHA-256: 6e302abe4c9a75b93996b15ed97d91bf0fdf88de972f064b44471c4d30127f0a
font_01_sfnt_off00015266.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15266 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016a7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16A7D 10908 bytes
SHA-256: 867ebe034a027eeb30b9ed34f63fc978550a2d2290998b713538fcc13c0a09e1