Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca8535c85695eb94…

MALICIOUS

PDF

84.0 KB Created: 2021-09-22 13:16:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 96ebbdb7ad0846df494e1170b9d117b2 SHA-1: b129fd30bd9ab6492db0855da10a15a773c007a9 SHA-256: ca8535c85695eb94057951587d2e99d9f6b3a711258998655c5a94fc0234a209
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains an embedded JavaScript stream and numerous URLs pointing to compromised WordPress upload directories, suggesting it functions as a link farm designed to redirect users to malicious content. The primary attack pattern involves luring users through these compromised sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/161347367a3ffb---36668926591.pdf In PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140b93f48841---8208279082.pdfIn PDF document text
    • https://matfreklam.com/calisma2/files/uploads/nafave.pdfIn PDF document text
    • http://csim.jp/ckeditor/uploads/files/rigaxidavisajavapugufa.pdfIn PDF document text
    • http://industrialsupplies.pk/userfiles/files/31273843793.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/161334782bb52c---masawatoxonup.pdfIn PDF document text
    • http://zuszdounky.cz/files/66882726545.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613a89aa50c34---vugesudobirifiva.pdfIn PDF document text
    • http://macautemple.com/userfiles/file/bizomuw.pdfIn PDF document text
    • http://giasuminhtam.com/Images_upload/files/79571517969.pdfIn PDF document text
    • https://szpital-sulecin.pl/images/fckfiles/file/tawufi.pdfIn PDF document text
    • http://highdeal.linkeo.net/ckfinder/userfiles/files/53522380191.pdfIn PDF document text
    • https://dalilak1.com/userfiles/file/rufalarininevedolepo.pdfIn PDF document text
    • http://universalgroupautos.com/files/others/6354368553.pdfIn PDF document text
    • http://cathugo-catamarans.de/res/wysiwyg/file/febapidojesikozatukebi.pdfIn PDF document text
    • https://coluer.ir/documents/file/93978862354.pdfIn PDF document text
    • http://nsfeed.com/_UploadFile/Images/file/vadogomo.pdfIn PDF document text
    • http://flexa.cz/docs/file/86124642525.pdfIn PDF document text
    • http://m-styleauto.com/js/upload/files/25002995147.pdfIn PDF document text
    • http://centralgiving.com/media/userfiles/file/46377846045.pdfIn PDF document text
    • http://di-tech.kr/fckeditor/userfiles/file/36615054256.pdfIn PDF document text
    • http://imobilestore.de/userfiles/file/vezotugixomolagokusuxu.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/vb8llb0v5a8q5uajkugt4v3r3u/sukotu.pdfIn PDF document text
    • http://safiorida.nl/operatori/userfiles/file/takejirarejexugeg.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=tennis+clash+hack+androidPDF 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_off0000e237.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE237 18528 bytes
SHA-256: fb37e3a7f414ec21b8c883f14e8603642ea6cb7623fae9dd0acc232cf0784ccc
font_01_sfnt_off00011298.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11298 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012aaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AAF 10424 bytes
SHA-256: eaffef5df847b2c1d58c32a895c7b890653a55bdd0a9cfc2153981a29703c862

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