Malicious PDF — malware analysis report

Static analysis result for SHA-256 df2eee28c1aaf5cd…

MALICIOUS

PDF

85.4 KB Created: 2021-09-24 02:29:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: bf1c80b5e281ec35945513b4139820a5 SHA-1: 0de19e9ba698a77076273498ad90fcf648d36fe1 SHA-256: df2eee28c1aaf5cd1331df7e81553b8c867521013bc57e1cd755416f3a24cde2
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. Heuristics indicate the document functions as a link farm, with numerous URLs pointing to external PDF files hosted on various domains, some of which are associated with compromised CMS uploads. The presence of 'utm_term' parameters suggests an attempt to track user interactions, common in phishing or spam campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://xahscw.com/userfiles/file/sivolejamomiregukovemozax.pdf In PDF document text
    • https://rent-1.es/ckfinder/userfiles/files/gojadipomukipipanolo.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613ecbda8dd8b---gizesaf.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/32bc18d1cc705e4a3fcc8d0abeefd4bb/joxuka.pdfIn PDF document text
    • http://safetyassessmentsolutions.co.uk/ckfinder/userfiles/files/xajimaxawadinoveku.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144ee3a67cee---30011863394.pdfIn PDF document text
    • http://nriloan.jctoursandtravels.in/files/nulalelisib.pdfIn PDF document text
    • http://tianfonmm.com/d/files/zamur.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/37eac29e520cbc55d88ce28feec6fccf/99549069500.pdfIn PDF document text
    • https://petala.gr/userfiles/file/pupewurujajewimam.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614c18b256ae0---19263775151.pdfIn PDF document text
    • http://xn--80aguejfegacgj0ad.xn--p1ai/pict/file/nipojixuserisafuke.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/789cd965bf972bf380d08a0768231abe/madelavavejifu.pdfIn PDF document text
    • http://yavuzselimvakfi.org/resimler/site/files/bemot.pdfIn PDF document text
    • http://pro-elec.ru/ckfinder/userfiles/files/29633882733.pdfIn PDF document text
    • http://lifecare4all.com/upload/files/52439018322.pdfIn PDF document text
    • http://qhchemicalsfeed.com/upload/files/nurakib.pdfIn PDF document text
    • http://kashima.cc/userfiles/file/96533086304.pdfIn PDF document text
    • http://eventologia.com/userfiles/files/50705684852.pdfIn PDF document text
    • http://juentai.com/userfiles/files/23244556084.pdfIn PDF document text
    • https://footballsod.com/images/ck-uploads/files/91880304682.pdfIn PDF document text
    • https://redengewinnt.com/userfiles/file/riwor.pdfIn PDF document text
    • https://absoluteanytime.com/media_file/files/files/96391312800.pdfIn PDF document text
    • http://e2ingenieros.com/ckfinder/userfiles/files/89884357767.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=come+disinstallare+una+app+da+androidPDF 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_off0000e82e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE82E 10684 bytes
SHA-256: 9174e3b3b50f43ffd0e127b890c59fc6d1be35627c55bd3c2118c6958eed9cc6
font_01_sfnt_off000100a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100A7 17448 bytes
SHA-256: a4afa36be79e632ddb542c66965a89c0a6f3d488cc98da28bae243bcd8d12343
font_02_sfnt_off00012e2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E2F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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