Malicious PDF — malware analysis report

Static analysis result for SHA-256 c80300ebe294315c…

MALICIOUS

PDF

81.0 KB Created: 2021-09-18 11:41:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: bdddd6056ceaaa3f8cb85b21d65e782d SHA-1: f9684c89e85ad705125c095ef72b886ddbb12b88 SHA-256: c80300ebe294315cbb6f8d4e856a47d26e3d5fe797310e868d98092bc002d1a6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link farm with numerous URLs, many hosted on compromised or disposable domains, suggesting an attempt to distribute malicious content or phish for information. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were directly extracted, the PDF structure and embedded URIs are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://ketchas.ru/uplcv?utm_term=install+flash+for+android PDF link annotation
    • http://npas.ru/pic/file/58997794403.pdfIn PDF document text
    • http://mnarch.it/userfiles/files/1756235984.pdfIn PDF document text
    • https://carcarnet.com/home/sandbox/domains/hkdance.tritek.hk/public_html/ckfinder/userfiles/files/26781254417.pdfIn PDF document text
    • https://nurdagihaber.com/resimler/files/1166951999.pdfIn PDF document text
    • http://termosystem.pl/userfiles/file/navijugil.pdfIn PDF document text
    • http://kleiberit.ru/files/file/runow.pdfIn PDF document text
    • http://pinxedien.net/upload/files/pofurivasonuz.pdfIn PDF document text
    • http://madonnina.info/userfiles/files/90512142538.pdfIn PDF document text
    • https://ariconium.cz/webpagebuilder/ckfinder/userfiles/files/1607987531.pdfIn PDF document text
    • https://kovtec.pl/eurostyl/photos/file/92144876767.pdfIn PDF document text
    • https://mattress-leader.com/media/14656074621.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/34591974007.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/16137d229af2a6---fefak.pdfIn PDF document text
    • https://ekransamara.ru/files/43779222496.pdfIn PDF document text
    • http://birnagarcollege.in/userfiles/file/59928844523.pdfIn PDF document text
    • http://gryfarmerskie.pl/pliki_wyswig/files/81330262872.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fbf848a280---lefagizimatigobun.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/161402cf1c2e96---57042452045.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/l7o7mfs3v8qfgu56ju8p9me4um/nipukowatifas.pdfIn PDF document text
    • http://reutlinger.pl/userfiles/file/34151996235.pdfIn PDF document text
    • http://www.sloepverhuur-debiesbosch.nl/upload/files/72185178266.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/42740347525.pdfIn PDF document text
    • https://bem-sa.com/img/file/6643426578.pdfIn PDF document text
    • http://ctmmaximoravenna.com/ckfinder/userfiles/files/35809348928.pdfIn PDF document text
    • http://zeguvietnam.com/uploads/ckfinder/files/xuzuriditajagejumuv.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_off0000d0d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e8ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8EA 10272 bytes
SHA-256: 361a9915cb86e6c0768d2bc3e4921961f7702d6261c605d3a571635d70ad68cc
font_02_sfnt_off0000ffe1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFE1 21032 bytes
SHA-256: c0d1ba60b4bade0ce4dbfb212f8c8d55bee868c3112d333d4526b66238b77a7c