Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf234afbe7832c43…

MALICIOUS

PDF

74.4 KB Created: 2021-09-07 02:23:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: cc04402aa2040f2a7ec974ff97776c1b SHA-1: 97a87c2a589f58f522edc6b3535e33d11c96e89e SHA-256: bf234afbe7832c43e81b778fe6fbea89b5ab836e2289168463d5c1d3151630e1
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs that point to other PDF files hosted on compromised websites. This suggests a multi-stage attack where the initial PDF serves to redirect users to potentially malicious content on other domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://yourtruck.be/upload/ckeditor/file/68235143218.pdf In PDF document text
    • https://termocasasrl.com/file/56697289763.pdfIn PDF document text
    • http://emke.hu/uploads/ckfinder/userfiles/files/49587805728.pdfIn PDF document text
    • http://maivietnamesecotati.com/uploads/files/96946886162.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16085a3d3a89cb---zamupufusivufapezuxir.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c1bb88b574d---78018164890.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b8b5e97ff91---27847687575.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/a0e3f035ca1c8408f9d04077e0e9d10a/49168448697.pdfIn PDF document text
    • http://sbairs.com/datas/files/95783157385.pdfIn PDF document text
    • https://martensmgt.com/business_school/uploads/file/zupekeg.pdfIn PDF document text
    • http://pc75.net/upfiles/file/1622264384.pdfIn PDF document text
    • http://aurora-c.jp/files/files/99877121137.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7b9d716c0---75318311411.pdfIn PDF document text
    • http://secretinvitation.net/images/files/71114554665.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/49145828134.pdfIn PDF document text
    • https://bushregenerators.info/userfiles/files/kisadiwerojol.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/68179589804.pdfIn PDF document text
    • http://hurtmar.pl/Upload/file/zojasugapisobiv.pdfIn PDF document text
    • http://www.mustwalge.ee/data/content/files/febovilisawosurazav.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091d45fa9843---71203593310.pdfIn PDF document text
    • http://normel.org/files/upload/file/vefivezanabedipaluxi.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612d5a32591c0---69192038415.pdfIn PDF document text
    • https://morabia.fi/images/file/73680744939.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=probability+density+function+pdf+cdfPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bb68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB68 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d37a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD37A 18364 bytes
SHA-256: 4633d34bea521577da2e413d054fe4a46fca55b09ec6df7f8493d49b1ff9bfdf
font_02_sfnt_off0001030f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1030F 10968 bytes
SHA-256: b4d68d1226d2816075933808fdc2c38fae19d7239ca9b316ccda2fd6c821633d

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