Malicious PDF — malware analysis report

Static analysis result for SHA-256 59803c489b3480e7…

MALICIOUS

PDF

85.0 KB Created: 2021-09-16 05:48:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 71210b5d62dded073c8225e5248ae735 SHA-1: 1efed64da704e627dc18568a2ae6594b16cda7b3 SHA-256: 59803c489b3480e758a8189566111ab667633dca2483c29b3be357c2e7fdd75d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm or phishing operation. The document's structure and embedded links indicate an attempt to direct users to external, potentially malicious, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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=cheap+houses+on+bloxburg PDF link annotation
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/d184008f581f33306f8e23c2a745e01c/22265413565.pdfIn PDF document text
    • https://www.pharmawell.eu/ckfinder/userfiles/files/tilekiwovumowifadekidod.pdfIn PDF document text
    • http://rszm88.com/upfolder/e/files/20210912045918.pdfIn PDF document text
    • http://svsteinfurth.de/radsportfiles/file/ruxabe.pdfIn PDF document text
    • http://salamino.pl/userfiles/file/fetel.pdfIn PDF document text
    • http://redigonda.it/userfiles/files/61429951293.pdfIn PDF document text
    • http://marketingnews.fr/images/file/52599290392.pdfIn PDF document text
    • http://dgxzz.com/uploadfile/file/tororiwijokidepavi.pdfIn PDF document text
    • https://at-studio.tw/app/webroot/userfiles/files/20210913_085257.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613624a5e3677---77851238192.pdfIn PDF document text
    • https://erdemlerkoleji.com/resimler/files/22540146750.pdfIn PDF document text
    • http://tortsurprise.ru/upload/redactor/files/90157040091.pdfIn PDF document text
    • http://sjhrz.com/images/upload/File/53737228683.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d292c1a998---puroretejukakuwed.pdfIn PDF document text
    • http://klwas.org/userfiles/images/file/42544205508.pdfIn PDF document text
    • http://bowlingkillers.com/imgdb/files/31769030476.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/pejapokojagezot.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/077cb71622bfb540cdaa641bb0b24889/xowetifamapuk.pdfIn PDF document text
    • https://www.suep.gr/ckfinder/userfiles/files/puwipefufewowawamapufo.pdfIn PDF document text
    • http://mywayrtk.org/userfiles/file/vubifaxiketakoz.pdfIn PDF document text
    • https://thebookonpersonaltransformation.com/FCKeditor/file/gagesigeruradozek.pdfIn PDF document text
    • http://waetsukai.jp/system/ckfinder/userfiles/files/74360304178.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_off0000ea2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA2C 10716 bytes
SHA-256: 211d9176ea5fba38f0ae30e1cfc10be2e140dfac652ecd9d426ec7d8e928aa79
font_01_sfnt_off0001028d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1028D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A9F 16884 bytes
SHA-256: 1e3203a5d1a0139d5f7dc5c428b8cced4fa97157a5b72af4cd8bc69b5ffbea6b