Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f1da7e066457698…

MALICIOUS

PDF

88.4 KB Created: 2021-08-13 15:29:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: d2f4be7332a23ded84b7bb5072c438a3 SHA-1: a7984c23ddec6af80258b20f21eb008174d199c6 SHA-256: 8f1da7e0664576980a027d817ae8746b988f2aa0f708d39e16a8cd0946f9f558
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 0.9972

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://bjhtdszdh.com/v15/Upload/file/20215132158284312.pdf In PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdcc6dd98ad---84493219212.pdfIn PDF document text
    • http://mrbossamktown.com/uploads/files/zajuwirivekazudiwed.pdfIn PDF document text
    • https://ayurvedaemart.com/uploads/file/gumowawojemazanep.pdfIn PDF document text
    • http://www.elitagida.com.tr/wp-content/plugins/super-forms/uploads/php/files/q9m8j2vps2859ct4vk7munkg01/bumodinogomixo.pdfIn PDF document text
    • http://samrayburnclassof1980reunion.com/clients/873185/File/rebenuruguzojetodubu.pdfIn PDF document text
    • http://cellesekorea.com/ckupload/files/bekusib.pdfIn PDF document text
    • http://slovbau.sk/test/userfiles/file/sugidewubejoj.pdfIn PDF document text
    • https://crownprolaw.cn/userfiles/Proj_Name//files/39769887982.pdfIn PDF document text
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/86ea193fba7c551a87a49ec7dba61acf/ranopizi.pdfIn PDF document text
    • http://box8websites.com/ckfinder/userfiles/files/sagixuvilogew.pdfIn PDF document text
    • https://drsubhashawale.com/ckfinder/userfiles/files/1493024920.pdfIn PDF document text
    • http://ceskylakros.cz/userfiles/file/naxizonovuseluluxasoga.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca4973ce8a---88805106799.pdfIn PDF document text
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/rro0pbkqtq3pp6naiq6vlu05i4/94551516268.pdfIn PDF document text
    • https://acrgroup.nl/userfiles/file/foloxiba.pdfIn PDF document text
    • http://nkcophs50threunion.com/clients/0/01/014062e559e26c1cf0711bcec4e573ae/File/14013215850.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160988557e2429---52775377628.pdfIn PDF document text
    • http://rotarybrescello.it/userfiles/files/jelinutusa.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7ef40966f---bomikaburezesalomegup.pdfIn PDF document text
    • https://monuments-msk.ru/wp-content/plugins/super-forms/uploads/php/files/fc294aef391d64ce64807c0420bb19f7/20279341219.pdfIn PDF document text
    • http://feynburg-uhren.de/uploads/gedabitovajukezojovinop.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a8c9be09fb2---biroku.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1606d7d193a2ad---28779513464.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=como+sacar+el+perimetro+de+un+circulo+apartir+del+diametroPDF 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_off0000f019.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF019 18360 bytes
SHA-256: 9be542297619d57eb7b5bb9f1fb116ac3c3c512440cbf540f06adc58bc8e980a
font_01_sfnt_off00011efb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EFB 10804 bytes
SHA-256: 7b691ded5bd13edb3ebae0b30318e8c9539186ca60f178a4bb6305a96ab7674a
font_02_sfnt_off000137e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1