Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3c7003c07ed30fe…

MALICIOUS

PDF

75.9 KB Created: 2021-06-25 22:04:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 6733e6d758f9cf22fb3819430a5413ac SHA-1: e4957a1c3bf512f5aa4cca839e2dcac7b2f4914a SHA-256: f3c7003c07ed30feeb4b0526cef9213a82de361fe33b59dc394f0d912ad65459
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to websites that appear to be compromised CMS uploads, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics. The ML classifier and ClamAV also flagged this PDF as malicious, strongly suggesting a phishing or malware distribution intent. The embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d3f17787ec---6081692229.pdf In PDF document text
    • http://voszveszprem.hu/_user/file/rotifopuzavep.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087b5391f25f---kamudasazedowidumo.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/812784567635cb06dfdbc9ebde402ace/rukefixurasid.pdfIn PDF document text
    • https://driftwoodcc.com/userfiles/files/80896384184.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/de71fc8d0a4f49e46acedd0bc068b561/51552760077.pdfIn PDF document text
    • http://bagiez.de/userfiles/file/vukiwoxelixujibukeseza.pdfIn PDF document text
    • http://bwc.lt/i/29949665649.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608f3279c4cf2---85633864638.pdfIn PDF document text
    • http://kaupa.cz/userfiles/file/67643329066.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a6f9ae9ff5e---mubebed.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/53159d74b5666e3810922c3c300c6d85/83627723749.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/45b8be6bbe53a9a95e88ef28c57adebc/18050450783.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2264ee2334---93103758411.pdfIn PDF document text
    • https://hotnews.md/upload/userfiles/files/71148464291.pdfIn PDF document text
    • https://auto-rujo.com/images-editor/file/44134981454.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16089145d18a06---32386605569.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609c7a7f2c17b---xurajuvukivofo.pdfIn PDF document text
    • http://gabinetortodontyczny.eu/userfiles/file/15643496460.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1607f676da45d6---lixiluxo.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/16096984e76324---bimibutigekudowupavivazu.pdfIn PDF document text
    • https://dbmotorbrokers.com/userfiles/file/27200563651.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082a387c0f01---teminigimujezakexo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=bob+dylan+down+in+the+easy+chairPDF 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_off0000c3e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dbf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBF9 10860 bytes
SHA-256: 05188268f8df3cc8291be68c1da5ac6996b0091c4b45ce8bdcd1016720e66b0c
font_02_sfnt_off0000f519.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF519 17212 bytes
SHA-256: 223a3e67b8e998950a2437d3ec9622dcb03dd289e11d256df5baf1b2f47b0146

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