Malicious PDF — malware analysis report

Static analysis result for SHA-256 40b9409cf5c0f303…

MALICIOUS

PDF

73.7 KB Created: 2021-09-15 17:32:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: afc23d6740a18ced4aa2033f89491966 SHA-1: 468ba9618c6557fd185daf2c7d5b2e07a86009da SHA-256: 40b9409cf5c0f303b353f951e20cf0431d742b57fa98d27185a71e4f688fbaff
156 Risk Score

Malware Insights

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

The PDF file contains a link farm hosted on multiple disposable domains, designed to trick users into downloading further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically related to phishing and trojan distribution. The embedded URLs point to compromised CMS uploads and disposable hosting, reinforcing the phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://elcwma.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/56590482156.pdf In PDF document text
    • http://mexvp.com/ckfinder/userfiles/files/8948001775.pdfIn PDF document text
    • http://chhattisgarhsanskritboard.in/sharpinstitute/images/files/34959612560.pdfIn PDF document text
    • http://jfhcoaching.com/userfiles/files/toredegutisoxeluveti.pdfIn PDF document text
    • http://philipwillettelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rubire.pdfIn PDF document text
    • http://buzmakov-ua.ru/admin/ckfinder/userfiles/files/47892376612.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5a1b56ebc8e02d4e9741edfe9ff028b8/19647046870.pdfIn PDF document text
    • https://www.privathospitaletkollund.com/ckfinder/userfiles/files/21135312868.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/oftv41m6pdfluosp340qnlhm0r/86458654078.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139ad70f2adb---detofaxutokiwezebexov.pdfIn PDF document text
    • https://stmpallet.com/ckfinder/userfiles/files/15070184279.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/20219121022391108.pdfIn PDF document text
    • http://udaybharat.in/ckfinder/userfiles/files/jobufuluja.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/811e82c1e0b4aaaf895b0547853790ac/sidurenovelafitodali.pdfIn PDF document text
    • http://gemculture.com/userfiles/file/45623767281.pdfIn PDF document text
    • https://exam10.menapoint.com/app/webroot/upload/files/76850189951.pdfIn PDF document text
    • http://hoteldazegliotorino.com/userfiles/files/21636409575.pdfIn PDF document text
    • http://robvancampen.nl/userfiles/file/50378303676.pdfIn PDF document text
    • http://cctsw.net/whly/up_files/FCK/file/20210913_050055_133.pdfIn PDF document text
    • https://mebelihome.ru/upload_picture/68215391574.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/161355c2c569fe---40760490799.pdfIn PDF document text
    • http://robfredo.com/userfiles/file/27718185383.pdfIn PDF document text
    • http://vinabomi.com/uploads/userfiles/file/54887436113.pdfIn PDF document text
    • http://nsdadventist.org/FCKData/file/nodoreti.pdfIn PDF document text
    • https://numen-wow.com/userfiles/cloud/files/52794437559.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=download+android+app+without+google+accountPDF 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_off0000bcb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCB6 10812 bytes
SHA-256: 1d210a6bb5451928c3415e56315243f894263b9b17a67fdfea7bc018391e3a7a
font_01_sfnt_off0000d560.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD560 17344 bytes
SHA-256: afa53b81c78177235262f06ab86fa2c813979ade790fb6df3ab7b7fadea9527a
font_02_sfnt_off00010091.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10091 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1