Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f6cbbce467acadd…

MALICIOUS

PDF

85.4 KB Created: 2021-06-28 02:49:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 35ee7416f2714f8ce9ee8732832b008c SHA-1: 2083ec99e73107b36489bdfd30cf5c78d9837901 SHA-256: 2f6cbbce467acadd4dc768b06fc91a7a90b55b2c51d6328f5a30aeef3f8c5b1b
156 Risk Score

Malware Insights

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

The PDF contains a large number of links pointing to various domains, many of which appear to be compromised or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable, so the rationale is based on the URL heuristics and the high-confidence malware detections.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://ytlcases.com/userfiles/file/52112663202.pdf In PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c727db01c96---kudivuwamas.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/logivitizam.pdfIn PDF document text
    • http://aggengr.com/uploads/CMS/file/xuvizalewukiz.pdfIn PDF document text
    • http://dongfangguohua.com/ckfinder/userfiles/files/99673990817.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc195d0e31---xotavizoxajexu.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c699076fcf6---tutosugesagigidof.pdfIn PDF document text
    • http://izdepskifamily.com/clients/1/1a/1adacdf247316bc4617b3617d965acc7/File/vabaf.pdfIn PDF document text
    • http://casier-a-bouteilles.com/file/jokin.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16075ed8bb87fe---46230353696.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/32520a6ff372ccee00ea3545d8416523/siwemerovamuseg.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/7009f3f278845ee784873012b25dbd07/fuwuliviwibiviwodexu.pdfIn PDF document text
    • https://classconnbio.com/img-jacson/files/bilujerinukimimolevi.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/43769r83tv8601e5vtn6rvoq6i/32960971753.pdfIn PDF document text
    • https://baptistfriends.org/media/wasizulusiwozipi.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a83833c96e2---64192870569.pdfIn PDF document text
    • http://s-moonlight.com/CKEdit/upload/files/88566127305.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/j65plbqke51c861thunql6epf4/zalemugupesezo.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5e8acbe941---14412007184.pdfIn PDF document text
    • https://nikken-engineer.jp/export/sd205/www/jp/r/e/gmoserver/8/6/sd0748886/nikken-engineer.jp/fckeditor/upload/file/tojorevepofaf.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606f970262645---wobalalesudonalepimiviba.pdfIn PDF document text
    • https://www.treehousecare.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb97d36334---jimududixirenudewepizal.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=circumference+to+diaPDF 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_off0000e671.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE671 10552 bytes
SHA-256: dc03e5496584dc32f3d49d790d375a0f61231ff95e1551a3f3f7024314504610
font_01_sfnt_off0000fe77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE77 19212 bytes
SHA-256: 1e9b120f52781f4940ff1e1adb530778106c3c6595d464702e967134e6713bd4
font_02_sfnt_off00013095.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13095 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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