Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f36e47ff1f806cf…

MALICIOUS

PDF

84.6 KB Created: 2021-09-15 05:03:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 840cac771a37df5d060ce20bde91e779 SHA-1: 2fa41db7653d67fea36cffcaba3861da9a65ee3f SHA-256: 1f36e47ff1f806cff9745eb63f3bd503de5e6fd11a0185ebbc08d6b3d57c5514
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as a malicious PDF by multiple heuristics and a machine learning classifier. It contains a link farm pointing to various disposable hosting sites, likely intended to trick users into downloading further malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics strongly suggests a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://leaguengn.com/userfiles/file///buvifunuz.pdf In PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613c18900b348---fagalibilit.pdfIn PDF document text
    • http://showpelec.com/data/file/20210905_092243_812.pdfIn PDF document text
    • https://peoplehelppeople.net/uploads/File/93412582918.pdfIn PDF document text
    • http://hoaphathotel.com/luutru/files/nimirisujoni.pdfIn PDF document text
    • http://mkngsp.ru/upload/files/55373813050.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614138ff1be2e---91180479262.pdfIn PDF document text
    • https://nwdglobal.com/ckfinder/userfiles/files/54236051978.pdfIn PDF document text
    • http://cuboni.com/uploadfile/hong202109051646395888.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141123a6fd75---60585993967.pdfIn PDF document text
    • https://pellevah.com/upload/files/85944935571.pdfIn PDF document text
    • http://finance-bulldog.cz/UserFiles/File/68050945580.pdfIn PDF document text
    • http://tao-oita.com/admin/upload_filesfile/32996360481.pdfIn PDF document text
    • http://immobilieninvestors.com/userfiles/file/kapadutexatidod.pdfIn PDF document text
    • http://nppgursaraijhansi.in/ckfinder/userfiles/files/20055643536.pdfIn PDF document text
    • https://peiitw.com/Upload/ckeditor/files/38560007307.pdfIn PDF document text
    • http://www.ettermanenterprises.com/ckfinder/userfiles/files/82623312647.pdfIn PDF document text
    • http://dennehylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tafomojurovefapepujeze.pdfIn PDF document text
    • http://xn----7sbakif2a3azdub.xn--p1ai/admin/ckfinder/userfiles/files/sadiluxafaragesuwoz.pdfIn PDF document text
    • http://neapol-m.ru/usr/file/95881790928.pdfIn PDF document text
    • http://cachnhietwin.com/luutru/files/92236618145.pdfIn PDF document text
    • http://unionnutritech.com/upload/files/27089427305.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614125e4c19a3.pdfIn PDF document text
    • http://rigosarchitects.gr/userfiles/file/jaduwilexodevivozafi.pdfIn PDF document text
    • http://ellev.fr/upload/files/43701204595.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=babumoshai+bandookbaaz+movie+downloadPDF link annotation
    • http://zs.tom.ru/jsplugins/ckfinder/userfiles/files/wapivoximitazoruba.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_off0000e69b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE69B 17256 bytes
SHA-256: 20b8b7ec4a7b8b7c093f88df1e45139c785b264e93ed72f7301c1a889a993037
font_01_sfnt_off0001135a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1135A 10912 bytes
SHA-256: cbbf36161e0b4963539c33e9b1c4099efc4535935a570be900f95645f5f5258d
font_02_sfnt_off00012c88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C88 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1