Malicious PDF — malware analysis report

Static analysis result for SHA-256 95bcb61b03dc4b06…

MALICIOUS

PDF

78.7 KB Created: 2021-09-05 15:23:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 43a62c1ed36b61f7c5b141746233691c SHA-1: 2a9281ac4b57feae1db7ae391f6a5b00f75b0519 SHA-256: 95bcb61b03dc4b06dd1e1a1454825f429b9d211a30cb33cfffb12251319cb440
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1190 Exploit Public-Facing Application

The file is identified as malicious by ClamAV and an ML classifier. It contains numerous links pointing to compromised WordPress sites, specifically within the 'formcraft' plugin's file upload directory, suggesting it's part of a phishing or malware distribution campaign. The PDF itself appears to be a link farm, designed to redirect users to potentially malicious content hosted on these compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • 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://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160d085628c1fe---kofosifebuwilonesel.pdf In PDF document text
    • http://1day2night.com/UserFiles/file/73568759961.pdfIn PDF document text
    • http://xn--12cm8caae5d9a0a0a1dxk6dd.com/user_img/files/39507506107.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a5518685318---xibegexifegolom.pdfIn PDF document text
    • https://isabellepieman.com/userfiles/file/dipodilozaboxivukap.pdfIn PDF document text
    • http://chretkinia.pl/userfiles/file/74822432331.pdfIn PDF document text
    • http://firmen-bekleidung.at/userfiles/file/6923062273.pdfIn PDF document text
    • http://iccarrentals.com/files/file/92337218247.pdfIn PDF document text
    • http://gasthaus-steinkirchen.de/img/editor/file/firotamowakube.pdfIn PDF document text
    • https://europartner2.pl/uploads/307676456.pdfIn PDF document text
    • https://vmwarts.com/ecovic/file/wavuperipolipipuxe.pdfIn PDF document text
    • https://vanphongphampmc.com/upload/files/60524748392.pdfIn PDF document text
    • https://www.jscorporation.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608768a03a9aa---73329180245.pdfIn PDF document text
    • http://cainghienbinhduong.com/uploads/userfiles/file/fabizejufegaredafojot.pdfIn PDF document text
    • http://www.teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/toduzobedewoze.pdfIn PDF document text
    • http://www.blueoak.fr/image/file/81733339972.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/f7ej79mn8d8r586mmgeha2m5qp/85082261330.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2085df4a9---59248631017.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/2db2f43f03f0095a35ba7387e5e2ebcf/retepakifiwemafugaw.pdfIn PDF document text
    • https://asharfilalkulfi.com/ckfinder/userfiles/files/tulurijuluk.pdfIn PDF document text
    • http://hifi-markt.info/kunden/kronhardt/ckfinder/userfiles/files/48464909545.pdfIn PDF document text
    • http://fly.no1-yes.com/userfiles/file/46683284324.pdfIn PDF document text
    • http://motorlustor.net/userfiles/file/67662094542.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/48b49289b33046fe20e21138ef0fb939/vegelemozodawelotose.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1607f18de10be3---4032856136.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=elevation+to+krishna+consciousness+pdfPDF 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_off0000c9e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9E2 18812 bytes
SHA-256: ec96a895a683794ddb72dfaa5c06ab450edb9661a146ef81de2a78701ca59746
font_01_sfnt_off0000fb68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB68 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001137f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1137F 10960 bytes
SHA-256: faf19bc3ef26f643acd5af219f5534e6cf1fa80ac8544e98c68a262c188c4537

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