Malicious PDF — malware analysis report

Static analysis result for SHA-256 40ed1cd76533a94b…

MALICIOUS

PDF

75.3 KB Created: 2021-09-04 14:11:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c80e501d1f4ec0f815da145fdd1801f5 SHA-1: 2d0cf595962136db61f23da3fd963e3d1cddd764 SHA-256: 40ed1cd76533a94bcdc163467e4c5c01863883260233f741eb9c9aabbac34f70
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier, indicating malicious intent. It contains a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites, suggesting it's used to distribute further malicious content or phishing lures. The presence of external URIs and link farm heuristics strongly suggests a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/16130775e8e14f---biporidatome.pdf In PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160a494af92919---dujimomojexenipadokutit.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e4c22d86e6b---tinabokogo.pdfIn PDF document text
    • http://fzcce.com/aimgs/uload/files/xekusowodol.pdfIn PDF document text
    • http://ehomerealestate.org/images/file/wegomofobagix.pdfIn PDF document text
    • https://gloriamus.org/Uploads/userfiles/files/32506253970.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/5161786026.pdfIn PDF document text
    • http://unsersohn.ch/images/file/demimafunudotike.pdfIn PDF document text
    • https://alate.org/admin/fckeditor/editorfile/sogawi.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/79445402417.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/jojonaliwalidisuxowobis.pdfIn PDF document text
    • https://ckmusicdesign.nl/userfiles/file/tadelofevufudafozufip.pdfIn PDF document text
    • https://benqmusicworkshop.com/fupload/file/kabefaguwapi.pdfIn PDF document text
    • http://bhavalaya.org/ckfinder/userfiles/files/28022923148.pdfIn PDF document text
    • http://whatifitspossible.com/ckfinder/userfiles/files/84032350927.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/mlpcfbg7585rmttrpc76jevdm6/napizo.pdfIn PDF document text
    • http://dsacare.com/admin/uploads/file/tolafixabodalat.pdfIn PDF document text
    • http://ilkemymm.com/image/files/96508632492.pdfIn PDF document text
    • http://archissimo.eu/userfiles/files/7046351689.pdfIn PDF document text
    • http://paramountswimwear.com/userfiles/files/kenobofotu.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c0c263c855a---mavuwepo.pdfIn PDF document text
    • https://esportenerd.com/app/webroot/ckfinder/userfiles/files/lalikapo.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db8996dea80---favinikexenaxowelogodex.pdfIn PDF document text
    • https://classconnbio.com/img-jacson/files/33514859117.pdfIn PDF document text
    • https://euforbiabulgaria.com/uploads/pages/files/kujepakomivaponakewipu.pdfIn PDF document text
    • http://elcampoeco.org/FCKeditor/file/47794519022.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=find+textbooks+online+free+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_off0000c4dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dcf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCF4 10640 bytes
SHA-256: 30dd92023dd601e1cbad47f4ed03e1ad6618c06601cff14960f6c0f2644ac5fa
font_02_sfnt_off0000f51e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF51E 16684 bytes
SHA-256: c2d458b77e3c7371ceac9635641308f809d469177c3af9291b72d1a933342135

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