Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4195fe9f9ac29ca…

MALICIOUS

PDF

69.1 KB Created: 2021-09-25 12:06:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c4e747ac3a9f9a41a81b0b09e68b497f SHA-1: 0703e7291a6f6d206f3907fdb128f315e34ca857 SHA-256: d4195fe9f9ac29ca8928519d0179e56e5d39190f021d5b559ba0248562e64a84
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to manipulate search results or distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://newat.ru/wp-content/plugins/super-forms/uploads/php/files/ecfecadbf8a2632cee034017148c238a/sinawozarapizevefefukusun.pdf In PDF document text
    • https://solener.info/ckfinder/userfiles/files/bukegom.pdfIn PDF document text
    • http://euroear.eu/ckfinder/userfiles/files/24119443936.pdfIn PDF document text
    • http://tianlanlawyer.com/filespath/files/20210904085419.pdfIn PDF document text
    • https://xn--z4qq44i.tw/upload/actfiles/bunoziliziw.pdfIn PDF document text
    • http://vbond.hk/editor_upload/file/36511968069.pdfIn PDF document text
    • http://pastadimatteo.com/ckfinder/userfiles/files/bapijokomalogebofutenobi.pdfIn PDF document text
    • http://kuwaited.com/cote_dor_import/admin/ckfinder/userfiles/files/porowedafan.pdfIn PDF document text
    • http://dekogard.net/deko/veri/_files/37925537521.pdfIn PDF document text
    • https://mosallaesf.ir/uploads/ck/files/40986970604.pdfIn PDF document text
    • http://exima.kr/userData/board/file/80993858056.pdfIn PDF document text
    • http://wcsps.com.tw/ckfinder/userfiles/files/bimezepizuverudova.pdfIn PDF document text
    • http://chokmanee.com/userfiles/file/7851746176.pdfIn PDF document text
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/42143622078.pdfIn PDF document text
    • http://zvezda-rostov.ru/ckfinder/userfiles/files/zuzazugetebeviradeboraxi.pdfIn PDF document text
    • http://geodez.com/pliki/file/46394312839.pdfIn PDF document text
    • http://evaemlak.com/userfiles/file///35627102045.pdfIn PDF document text
    • http://dalaichau.com/files/3120192482.pdfIn PDF document text
    • https://relaxbotanika.cz/ckfinder/userfiles/files/50425277159.pdfIn PDF document text
    • https://www.naabelectric.com/userfiles/files/fowenorufiwugemufizesij.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/rj1vvsmpdrtbo7ej0ugu0i6pkv/gudojadodizirerirozof.pdfIn PDF document text
    • https://sindhuinvestment.com/ckfinder/userfiles/files/30671890342.pdfIn PDF document text
    • http://tvcsoltau.de/userfiles/file/dasemo.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b05ef1322f---tubipenuvuta.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=preliminary+english+test+reading+and+writing+sample+test+6PDF 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_off0000af68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF68 14840 bytes
SHA-256: d16d9d66b30a7509e994e0b3b1f234bfc92ccf8259f79af9d51e33977be171f2
font_01_sfnt_off0000d4a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4A1 11088 bytes
SHA-256: acb06b5b4afbfe74a685b2f8148a8ef1de8b0b1b214576601d56d4ef7f887bc2
font_02_sfnt_off0000ee1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE1C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1