Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8d514b883e7ebc5…

MALICIOUS

PDF

86.2 KB Created: 2021-09-11 09:36:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: cff876bdbd077faafe571c8fca9085f3 SHA-1: d1b6a09f7e1b70e2e58865ec895df7cb451bbf1c SHA-256: c8d514b883e7ebc512096a91d4b04dcd7f27b88fb684879ef7e13951216b812f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to potentially compromised WordPress upload directories or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were directly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://egitara.com/upfiles/files/wikivodokokudotabexi.pdf In PDF document text
    • http://conniecorsentino.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/naxakebozazoxowefar.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210903031459909943999.pdfIn PDF document text
    • http://capitaloffice.pl/fotki/file/48850880536.pdfIn PDF document text
    • http://jlicentral.com/images/authors/file/56430082156.pdfIn PDF document text
    • http://growlink.biz/userfiles/file/72428426598.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613ae3f25d843---paserume.pdfIn PDF document text
    • http://ytovietnam.net/ckfinder/userfiles/files/jufemijanikates.pdfIn PDF document text
    • http://sahamit.net/userfiles/file/10301105573.pdfIn PDF document text
    • http://www.moyekolodin.com/files/nitebofizezoleduzitevira.pdfIn PDF document text
    • http://irths.com/upload_files/files/sevol.pdfIn PDF document text
    • http://thaiboxes.com/piceditor/file/wojawaremijemag.pdfIn PDF document text
    • https://artistprasanna.com/userfiles/file/luvolikemezesidewokasut.pdfIn PDF document text
    • https://zzwgjx.com/d/files/wixupaxuwe.pdfIn PDF document text
    • https://biocoils.com/img/file/21281246739.pdfIn PDF document text
    • http://varvshistoriska.com/file/zemad.pdfIn PDF document text
    • https://machnhaduong.com/images/uploads/files/6667088331.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612e99b3e8166---30896299475.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132e04b37214---demijuruxopabonaguw.pdfIn PDF document text
    • http://htwy.com/upload/file/89242400687.pdfIn PDF document text
    • http://www.mustwalge.ee/data/content/files/62432452362.pdfIn PDF document text
    • https://faktxeber.com/resimler/files/tifure.pdfIn PDF document text
    • https://moveo-sport.pl/userfiles/file/61826196208.pdfIn PDF document text
    • https://10kshot.com/customerinterview/ckfinder/userfiles/files/71098436954.pdfIn PDF document text
    • https://chuyennhakienvangvn.net/upload/files/56868577087.pdfIn PDF document text
    • https://tmtteks.com/files/zifotasusikezoberela.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=reasons+for+dizzinessPDF 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_off0000ed5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED5E 10308 bytes
SHA-256: c45cf37d7765e8b2f9facf482233d73168a5f357c362e2b38fbaa282f1af013d
font_01_sfnt_off000104bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104BB 17868 bytes
SHA-256: 9ba2f1cce54d55278fb7951dbaf25bdab76528e1d82e61f1fa9912792cd1b474
font_02_sfnt_off000132fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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