Malicious PDF — malware analysis report

Static analysis result for SHA-256 3729d9fa361873a7…

MALICIOUS

PDF

81.6 KB Created: 2021-09-05 11:07:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 739e3a18fea158d3fcd813488712beeb SHA-1: 72efefb96280112be737e0c8464678a883c6114b SHA-256: 3729d9fa361873a72355ad9fbb3894262b0c71fcaabbb479b405c532b668d513
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or redirecting users. Multiple heuristics indicate the PDF is part of a link farm, with many URLs pointing to disposable hosting or compromised CMS upload directories, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://queure.ru/uplcv?utm_term=grandezas+diretamente+e+inversamente+proporcional+pdf PDF link annotation
    • https://lordpin.com/calisma2/files/uploads/81753760093.pdfIn PDF document text
    • http://sochi-polyana.com/ckfinder/userfiles/files/15785155798.pdfIn PDF document text
    • http://zdrowejaja.com/Upload/file/22041351138.pdfIn PDF document text
    • http://k-ookuma.com/js/upload/files/zujiginej.pdfIn PDF document text
    • http://kleinschadenexperte.de/userfiles/file/41618404178.pdfIn PDF document text
    • https://yuh-tarng.com/userfiles/file/xurowajoxidif.pdfIn PDF document text
    • https://amursvoidom.ru/media/files/lifokugagikozokokalumosif.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bb399d977c7---2264936746.pdfIn PDF document text
    • https://tranhdaquyhn.com/uploads/news_file/petoja.pdfIn PDF document text
    • http://ats-dz.com/userfiles/file/tujopajudogape.pdfIn PDF document text
    • http://pttaccounting.com/userfiles/files/85752389366.pdfIn PDF document text
    • http://104408017.linker.tw/files/73601526170.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee41fd0fb42---nisorusegadoxugaworoxumo.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4fa211fce1---sususazonefafelokowizuf.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/2e5bf0c15a44dce643c2ea4af33e88dc/posopogesajezazesifokiwur.pdfIn PDF document text
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/1607a012753653---zojugiwefabiritamoresa.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608056aad2e2a---dibevaxamulapemipifa.pdfIn PDF document text
    • http://0vote.com/ckfinder/files/68350888698.pdfIn PDF document text
    • http://ejmk.com/ej/upload/files/karepalonuvotisinipowam.pdfIn PDF document text
    • http://potlista.com/file/files/68775743493.pdfIn PDF document text
    • https://gea99.com/ckfinder/userfiles/files/78997883194.pdfIn PDF document text
    • http://hawks79.com/clients/85064/File/37405428187.pdfIn PDF document text
    • https://yukkumpulgroup1.com/contents/files/repovopinuf.pdfIn PDF document text
    • http://labonscafe.com/userfiles/78603868168.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_off0000d4b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4B6 19984 bytes
SHA-256: 70a44f41b82c91c0908099e7c69a9c968e03ee1eac95bc9650d1717bc4f8fb01
font_01_sfnt_off00010717.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10717 10944 bytes
SHA-256: fb87907faf667aebb21a5357b0456d904fc28ed0e9719a0b06ce8b017e502bf1
font_02_sfnt_off00012088.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12088 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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