Malicious PDF — malware analysis report

Static analysis result for SHA-256 df02afb08a1e14b9…

MALICIOUS

PDF

71.8 KB Created: 2021-09-27 09:00:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 428acd8047dbad8c4bc059d7d343a095 SHA-1: 6e6cdce2e33fee64aa617d30ccc7fa01545ed635 SHA-256: df02afb08a1e14b9a815e9fbf7e756453c7efd9afc482ab6b22b88bd94e9f5c3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. Numerous heuristics indicate the PDF is a link farm pointing to compromised WordPress uploads and disposable hosting, likely to host phishing content. The embedded URLs, such as 'https://archism.ru/uplcv?utm_term=banking+app+detect+root', suggest a focus on credential harvesting related to banking applications.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://archism.ru/uplcv?utm_term=banking+app+detect+root PDF link annotation
    • https://ofly.om-digitalsolutions.cn/upload/files/57306868586.pdfIn PDF document text
    • http://volker-issmer.de/userfiles/file/2021450294.pdfIn PDF document text
    • https://ariconium.cz/webpagebuilder/ckfinder/userfiles/files/rofowugajivitemenosu.pdfIn PDF document text
    • http://rjt1.org/upload/files/52848164613.pdfIn PDF document text
    • http://chemonova.com/FCKeditor/file/13369079262.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614710a9642f3---72862565044.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614cdc31d0f1d---rawetosanu.pdfIn PDF document text
    • https://illustrations.noche.fr/images/files/lefele.pdfIn PDF document text
    • http://revucue.com/ckfinder/userfiles/files/nolomoz.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/a84346ddaa25f7f84b86555db1777311/53978264882.pdfIn PDF document text
    • http://rongqichem.com/upload/files/somififunusakoxakalujer.pdfIn PDF document text
    • http://sydjpg.com/images/upload/file/20210923_154937_142.pdfIn PDF document text
    • http://galettedesrois.eu/userfiles/file/digogutug.pdfIn PDF document text
    • http://montoaneli.com/ckfinder/files/93547827295.pdfIn PDF document text
    • http://restaurant-lyons.fr/userfiles/file/jusutajulop.pdfIn PDF document text
    • https://dom4m.by/userfiles/files/25442143919.pdfIn PDF document text
    • http://df-2.de/images/daten/file/zudeju.pdfIn PDF document text
    • http://romanasulcikova.cz/userfiles/sewad.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/41e8b21b2e8a25f53c4d1dd5477ef8a5/xegesujerudamiduzo.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/1614c2ef97532e---serasigago.pdfIn PDF document text
    • http://studiomarcheluzzo.it/userfiles/files/tibemofitosuxikumogi.pdfIn PDF document text
    • http://lonsdale.ee/tipikas/uploads/sisupildid/vilegefevonozonibifime.pdfIn PDF document text
    • http://borik.customreal.sk/data/files/sokerakeradebora.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_off0000b3bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3BF 10620 bytes
SHA-256: d82456efaabc3e946908d9aceb41d17ea67a3555664df98ac9014ade6e9ee546
font_01_sfnt_off0000cbf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBF4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e406.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE406 17792 bytes
SHA-256: b38295a442645a9d93820521ddc16e2b15ced71a4bef8be9fc415eb56d25efcd

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