Malicious PDF — malware analysis report

Static analysis result for SHA-256 e868496df0998673…

MALICIOUS

PDF

76.5 KB Created: 2021-09-01 01:49:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 47dec64206491d02399a4bf7c3768f2e SHA-1: 55bd9a8f89c98ecdaaecdab400e9d192c92fbd2d SHA-256: e868496df09986736bdb00f12c3ede19f3ed0a0508e571f0cca3f4c111bf4b13
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and functions as a link farm, pointing to multiple compromised WordPress sites. These sites, in turn, host other PDF files, suggesting a multi-stage redirection or phishing campaign. The presence of embedded JavaScript indicates potential for further malicious actions beyond simple redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/15ensqpmob6j0v05ot1jdem545/95899954610.pdf In PDF document text
    • https://ppuhperspektywa.pl/files/edytor/file/80748534889.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/35e20eea1d9cbe5aadf6f8fb307deb04/vesapijibusewogawezil.pdfIn PDF document text
    • http://28777886.com/Lpf/UPFILE/userfiles/files/42290393978.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/f0e6baec4862cbf77c89f0b6319e8987/95262406307.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adf59dad3b0---80493326600.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/ad788a8946a056cba2303b79b8d27b53/32504171027.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/e234110c582d7f7286efc1afc953dd4b/faromogalefibep.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c9545949a08---jelawisu.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/3ab3fdc49fce79547b0ab14913a08e18/26907861403.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9b167b6af4---58655845024.pdfIn PDF document text
    • http://eschool365.in/js/admin/uploadfiles/file/70952977783.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/2131f2ec53dbd226db2936b239b49c5a/42420364444.pdfIn PDF document text
    • http://mojahotels.com/ckfinder/userfiles/files/juziwesamelonibug.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca019bb5aa---bositotixawadox.pdfIn PDF document text
    • http://chsbicentennialclassof1976.com/clients/c/c2/c283bfa2537a82fb79a670aa087b4bd4/File/10341788141.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/soxinigipezaxev.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e3077708f4---44376149271.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160c6e15bd87c2---jirorupedapojip.pdfIn PDF document text
    • http://apexnepaltravel.com/userfiles/file/wiwubasoxoropopofap.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=main+engine+sea+water+cooling+systemPDF 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_off0000c991.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC991 16092 bytes
SHA-256: 5f6441f044d9f3fd11c810978827a7b6964ac99a75683da4aea39e7801e9a039
font_01_sfnt_off0000f2fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B13 10764 bytes
SHA-256: 3b7f0e0b1cca43ca9ba183e55e65bf17524819b84588412a7bad2afd2fb4a860

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