Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b62a18814946adc…

MALICIOUS

PDF

95.6 KB Created: 2021-06-30 19:34:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3b4eba7f282b1c6e5a0b8f3b7edaefa9 SHA-1: 6c430a1f2b4272fe2a606553204ae73c10284150 SHA-256: 9b62a18814946adcad3fd5f5acc3141f979285982660dc008a215d963648d833
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, indicating a link farm designed for SEO poisoning or phishing. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URLs point to a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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://medvor.ru/uplcv?utm_term=side+effects+of+high+calcium+levels PDF link annotation
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16075d493a1272---ziguva.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/regufijasezirulade.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16090e0bd76687---33504605043.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16085f52e0584c---ramugoxanase.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/2e25fc68639fa78da2ad7e94efe0c033/wewaxo.pdfIn PDF document text
    • http://ytlcases.com/userfiles/file/soxasumedaxigegawadoma.pdfIn PDF document text
    • http://steakclubhn.com/campannas/file/fetewo.pdfIn PDF document text
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/00e1c6329964bb9a954516b5fe528a9d/61385945088.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/diwinasizudurixe.pdfIn PDF document text
    • https://ibeguiristain.com/userfiles/files/rufelexukakonifik.pdfIn PDF document text
    • https://apc-algercentre.dz/ckfinder/userfiles/files/57215066673.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/97e3200bb3316098a1db911db36f867a/wejide.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/13451657338.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ae343a504c9---xevenifotavivo.pdfIn PDF document text
    • https://nikken-engineer.jp/export/sd205/www/jp/r/e/gmoserver/8/6/sd0748886/nikken-engineer.jp/fckeditor/upload/file/nozused.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/7k2lvtflkm4bourj9mivpadqpi/1192754010.pdfIn PDF document text
    • http://cameralehiep.com/hinhanh_fckeditor/file/74574383958.pdfIn PDF document text
    • http://cabin4kids.org/clients/0/05/050cd0fff5f75fdfd14851583cc0de74/File/nedovivigaxu.pdfIn PDF document text
    • http://montaze.org/democms/userfiles/file/guwenejinurupurivoxu.pdfIn PDF document text
    • https://congchungnguyenlieu.com/uploads/files/10063362646.pdfIn PDF document text
    • http://nena-artspace.com/ckfinder/userfiles/files/mapuge.pdfIn PDF document text
    • http://brukbet.com/user_images/file/71633319842.pdfIn PDF document text
    • https://angkalaris.com/contents//files/gejofakewojewaredorevuf.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/0qen8cq5phhq3ogn4eda46tvlm/63941631698.pdfIn PDF document text
    • http://xaydungphongphu.com/uploads/files/xorukajatim.pdfIn PDF document text
    • http://yngc.ru/admin/ckfinder/userfiles/files/wuziletuli.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_off000113a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113A1 10960 bytes
SHA-256: 404534fd1997754f083f3fbd9beb2b14772e203da5fdf3e655118b6c9ef1bdaf
font_01_sfnt_off00012cdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CDF 16920 bytes
SHA-256: 807e8f5b1d7e24b7607c8736599816a08966bdb16a6a4c06697d0496547b04b6
font_02_sfnt_off00015918.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15918 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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