Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cf0afe59be4f6b9…

MALICIOUS

PDF

73.4 KB Created: 2021-06-23 16:05:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 18b6b99d46aadeb981f5bcba0bb24281 SHA-1: 330049926d915f679c30ea455105784555470421 SHA-256: 8cf0afe59be4f6b99d0059ac912d6f96974f85e1568b18a4a2e4a1aa69db2893
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous links to compromised WordPress sites, specifically targeting the formcraft plugin's file upload functionality. These links likely serve as a distribution point for further malicious content, such as phishing pages or malware payloads. The presence of multiple distinct hosts and the use of 'utm_term' parameters suggest an attempt to create a link farm for SEO poisoning or to obscure the true destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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 https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087162fd0aaa---45712462262.pdf In PDF document text
    • http://slp61.com/clients/e/e2/e296dcecfd7d10ffef0cc83fef253c72/File/rojote.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160adc41bd7564---69362395379.pdfIn PDF document text
    • https://fceresources.com/ckfinder/userfiles/files/21034310277.pdfIn PDF document text
    • https://mumegram.com/userfiles/file/3670814491.pdfIn PDF document text
    • http://romanakladatelstvi.cz/userfiles/file/wawexomegawonubisegupimuk.pdfIn PDF document text
    • http://infinity-pro.ru/userfiles/file/zejizikupoliz.pdfIn PDF document text
    • https://www.engltg.com/wp-content/plugins/super-forms/uploads/php/files/1edb0ae69cb457331b4b6a553c063099/98737191568.pdfIn PDF document text
    • http://ipmarketing.net/userfiles/file/12345090715.pdfIn PDF document text
    • http://opakowania-loga.pl/zdjecia/fotki/file/mapalovolejotapuledosov.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/vunazimawuto.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aebf0e2ca6d---tamutifepovovolugos.pdfIn PDF document text
    • https://ph2020.org/FCKeditor/file/vaposagatigomove.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6e45b192ce---bowiso.pdfIn PDF document text
    • http://diplomat2014.ru/ckfinder/userfiles/files/mosokanotazimejemew.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=mama+by+celine+dion+mp3PDF link annotation
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d30f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD30F 5064 bytes
SHA-256: 8cc5eb172b4f0977af9db70f11daf4275d28525e091bc93461147bc7f1043fdf
font_01_sfnt_off0000e431.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE431 14096 bytes
SHA-256: f9a3bfd90c9d883b897beb2cb3125b7634d14e43d84dc6f3f285c91c78d7f442
font_02_sfnt_off0001129e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1129E 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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