Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d8977e164472a3c…

MALICIOUS

PDF

80.6 KB Created: 2021-09-07 04:00:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d4a6ea99e81f96c8b62288e23784e976 SHA-1: 8ae6a9271783ee8466cb6f545541c2dbec796448 SHA-256: 8d8977e164472a3c70e9da06bf6ed4a8bc306a2f5650ea9d7519308bd1789857
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, detecting it as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting, likely to redirect users to malicious sites. The `utm_term` parameter in one URL suggests a potential lure related to 'fighter bomber manual'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://turbotechnik24.de/userfiles/file/81710751950.pdf In PDF document text
    • https://atraba-holding.com/userfiles/file/timupusilawi.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ba0c2f2767a---dutenabinijewulazil.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/62053fc5989b3b4f9daa3c152353c3e9/17573087411.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160fcea3459cbb---38523439086.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ac9d51ee89---lewuxavuboxive.pdfIn PDF document text
    • https://hotelpancharatna.com/assets/userfiles/files/68402199278.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160967d858ada7---75328943276.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160b379fbe137a---gasefesitarutiketijaxinub.pdfIn PDF document text
    • https://brihat-group.com/assets/userfiles/files/luwujefexunurafumasezoz.pdfIn PDF document text
    • http://iwilldoit.ru/uploads/files/files/78989184711.pdfIn PDF document text
    • http://heaig.org/editor/ckfinder/userfiles/files/difijuvesutogeveruj.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/160b7661c6b1d8---gujikotefidefikuz.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160cfced9cb1c6---bixab.pdfIn PDF document text
    • https://pnp-studio.com/fckeditorfiles/file/pujanox.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6f45450e73---95322448543.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cecc34e84a---fepevibuzugesumilegubutu.pdfIn PDF document text
    • http://pi-consulting.ch/download/10391536376.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1608f72ef4efc3---jibibebejukifugafebakojux.pdfIn PDF document text
    • http://zionhillfirstbaptistchurch.com/clients/73368/File/34837692542.pdfIn PDF document text
    • http://packturf.fr/files/65437697650.pdfIn PDF document text
    • https://www.adoz.cz/ckfinder/userfiles/files/15919235531.pdfIn PDF document text
    • http://www.northern-japan.com/image/upload/File/57994317318.pdfIn PDF document text
    • http://monticellotownship.org/userfiles/file/69218194518.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=fighter+bomber+manualPDF 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_off0000d7c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7C7 17392 bytes
SHA-256: 392b3a9a694535e07e990c9a86a329a042c7db5c30c584d042a3d33596b21136
font_01_sfnt_off00010525.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10525 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D3C 10604 bytes
SHA-256: 13ff7f85826962beca08240d9a8ba074d768b84d67fab6eb2d5c054a4a6ca00b

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