Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d9f1c5159a49095…

MALICIOUS

PDF

95.0 KB Created: 2021-08-03 21:52:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 70aa72d0426cd9ed268da85981e15ad2 SHA-1: d7d98fcd11c658ccb4dd6bf626d09c2513307fbf SHA-256: 8d9f1c5159a4909593eb2aa799fbbebfa58231b465b65e4d6ab99d823fce9777
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://leganordavigliana.it/uploads/file/54747883405.pdf In PDF document text
    • https://eghamatkade.com/basefile/eghamatkadecom/files/viwijumi.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/4r5rq46l8sqcid12onbfhi8n94/sunifetavi.pdfIn PDF document text
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/160858782ef54e---jilew.pdfIn PDF document text
    • http://emailreceptionist.net/userfiles/file/pored.pdfIn PDF document text
    • https://reinigungsfee007.de/wp-content/plugins/super-forms/uploads/php/files/cs00r6c2847fj1tqo8ljuht8g3/83850384136.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bed11ace989---xibanudejo.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/fefad46bc36b4c9a0c4420e8d039be6f/fuwefekab.pdfIn PDF document text
    • http://hms31.ru/img/file/tabokonigizin.pdfIn PDF document text
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/7ea672d9cbc2f13125a5747e1e7886c8/1893090711.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a76b75a915.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/40771224114.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf409714ec3---68848823407.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/19204168149.pdfIn PDF document text
    • http://thetownsendfamily.net/clients/a/ab/ab79602242cca8f930cd52af13df1d51/File/61025466197.pdfIn PDF document text
    • http://gruppocaminiti.it/userfiles/files/86747027757.pdfIn PDF document text
    • https://eseninternational.com/uploads/files/90859969140.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/83deda1f69514d69aaa9f50a959cbaef/wojizonof.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1610261189d1a0---43305368007.pdfIn PDF document text
    • https://roomart.uz/ckfinder/userfiles/files/4642061251.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/7f77629ffb4b223752f9aa3ecab03a2a/99683498512.pdfIn PDF document text
    • http://thecreditcrisis.net/clients/73966/File/busenip.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=why+does+my+panasonic+sound+bar+keep+cutting+outPDF 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_off00010a6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A6A 11352 bytes
SHA-256: 262435c5fca48a4da8d5a6ad9222e1506c2dad8c9c18b60cfb77f2b9d1cb3989
font_01_sfnt_off00012493.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12493 18496 bytes
SHA-256: bc7ac4cc6b9c618a55da05f940504d73929ef22c5c3edfcde388412c60097294
font_02_sfnt_off000154f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x154F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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