Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f73fd509c1c75f1…

MALICIOUS

PDF

76.9 KB Created: 2021-09-07 11:07:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f4bc8b5027b3363041016e161aea0d24 SHA-1: c039a0c6061011076cf257aac6a0c8c38bbb7a8b SHA-256: 6f73fd509c1c75f1792f9741f083d08ff999c461d74a742b72afd29712261480
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a phishing or trojan threat. It contains a link farm pointing to multiple external websites, some of which are hosted on compromised CMS upload storage. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the presence of numerous external links suggests an attempt to redirect users to malicious content. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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 http://lacasedescaraibes.fr/file/11822298985.pdf In PDF document text
    • http://johndanton.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/81734173963.pdfIn PDF document text
    • https://hr-serdahel.hu/images/file/99182307288.pdfIn PDF document text
    • http://sitoad.com/bbqjoekey/files/202109050134461813.pdfIn PDF document text
    • http://auburn-companies.com/userfiles/files/zovanixoxat.pdfIn PDF document text
    • http://hzzxtl.com/UploadFile/file/20210617230305244.pdfIn PDF document text
    • http://tetobox-budapest.hu/uploads/files/turerebopazudilotupabi.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/nn1rptsgsjh4aiv62nk5l38fkb/tomonajowulepuvojove.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/m80608sjmhv9443rsovhebdcj0/vekokufibidexaloxojima.pdfIn PDF document text
    • http://forter.vn/hinhanh/file/6959172222.pdfIn PDF document text
    • http://klefmarken.se/upload/file/27034418666.pdfIn PDF document text
    • https://petkasem2hospital.com/images/upload/userfiles/files/61902465720.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16095aaa03dbe8---78134309770.pdfIn PDF document text
    • http://zekidilektekstil.com/images_upload/files/nitebirozifaxiza.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161295aa508dc1---vumogolasopowaxok.pdfIn PDF document text
    • http://dieterheich.de/images/uploads/file/3094141263.pdfIn PDF document text
    • http://lbtech.kr/upfile/files/loroje.pdfIn PDF document text
    • https://gastriklandsbf.se/UserFiles/files/71176756213.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/qhhn94ai19dc7i2dlsia14j2c4/26565943198.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/25285146465.pdfIn PDF document text
    • http://vako.vn/app/webroot/uploads/files/koragugifafu.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16128aba5c8849---woxapadakavapew.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=czardas+piano+violin+pdfPDF 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_off0000ca9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA9B 10416 bytes
SHA-256: b90f7c79dfbe4ed5a942a9555729668c5e20e68a9eb664bd395feb172c543b34
font_01_sfnt_off0000e24f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE24F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fa61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA61 17044 bytes
SHA-256: e48cbc171ab228e3efdc9679b3f403a92194d6e00278a4ae4d11396ccdaaebfb

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