Malicious PDF — malware analysis report

Static analysis result for SHA-256 d66443ce72a0ff62…

MALICIOUS

PDF

70.9 KB Created: 2021-10-01 17:05:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 0672354ef45416b2131ae3774cb1eaa3 SHA-1: ca985699ae01b488d1687fd43c423cbfec1dad8a SHA-256: d66443ce72a0ff6212eccf52ba12121aa67724fccb00942b065fa62183ba94c6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm hosted on compromised CMS uploads, specifically pointing to WordPress upload storage. The embedded URLs, while many are marked benign, include several unknown reputation links hosted on potentially disposable domains, suggesting a phishing or malware distribution scheme. No scripts were extracted, but the PDF structure itself is used to host and redirect to these external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614deaff9ccee---zapijudebolejutesu.pdf In PDF document text
    • http://ilovestory.com/upload/file/35827587623.pdfIn PDF document text
    • http://ardeche.proximeo.com/ckfinder/userfiles/files/14535619844.pdfIn PDF document text
    • http://obrienbuilders.com/userfiles/file/sogozedorigixovexubofawi.pdfIn PDF document text
    • http://levakov132.ru/userfiles/file/72610508832.pdfIn PDF document text
    • http://matchonusa.com/uploads/files/gutamokav.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c5f60bdb6399fb369c423df60065fd3b/gefexekinijuzupotewaz.pdfIn PDF document text
    • http://kindergartenhelden.at/upload/file/wesojalejirasajonevogufof.pdfIn PDF document text
    • http://hzeiger.com/userfiles/file/gejexomuz.pdfIn PDF document text
    • https://laurallo.com/ckfinder/userfiles/files/86803631746.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613eaa26c23e4---dopavadufebok.pdfIn PDF document text
    • https://3eyamaichi.com/upload/ckfinder_temp/files/20210913052104.pdfIn PDF document text
    • http://tech-in.info/bramy/userfiles/file/dekerudufixosofi.pdfIn PDF document text
    • http://northcity.rs/slike/files/vamukevofamedoj.pdfIn PDF document text
    • http://15449010.com/FileData/ckfinder/files/20210930_D0AA879A843869EB.pdfIn PDF document text
    • http://techcessgroups.com/userfiles/file/26761228821.pdfIn PDF document text
    • http://quinta.cl/upload/files/gijijidoxezofas.pdfIn PDF document text
    • http://namlinhchisapa.com/userfiles/image/file/nabilitizubi.pdfIn PDF document text
    • http://club-integra.ru/userfiles/file/pesatesunasimazizet.pdfIn PDF document text
    • https://semineebrasov.ro/printuri-fi/files/92010825219.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613123d8890a4---lonituzikilox.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/161567e2543d1b---8289728495.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=streaming+attack+on+titan+season+3PDF 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_off0000b22a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB22A 10868 bytes
SHA-256: 47f94fe0b1fd277c706d59741a401187a916ebd68f2ba4acdf7b69f805d71866
font_01_sfnt_off0000cb4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB4A 16260 bytes
SHA-256: 1dd0491e2a693437b03a9c32d26463e69020d8950c7f4af62936f8a201192ee6
font_02_sfnt_off0000f44b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF44B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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