Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf7e154c4164f9ad…

MALICIOUS

PDF

90.5 KB Created: 2021-08-23 09:33:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 13c73d721499550a3ddf20584afc8368 SHA-1: f6cade032daa45369114737fae8c90b16416ec38 SHA-256: cf7e154c4164f9ad5e601881955b69ff748b18326abb9dfa9d8ecc1bd64ce461
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites. The embedded URLs suggest a phishing or malware distribution scheme, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088be5a1e344---97738347163.pdf In PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8bedc08672---vonexaxevajakuj.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7747a5cf8f---lokerutalasiki.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/8e4612033c4d0687d3552edcf47e041c/58385145604.pdfIn PDF document text
    • http://www.chatanakonci.cz/userfiles/file/21140395193.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/5124581366.pdfIn PDF document text
    • https://perfecthospitals.com/FCKeditor/file/91219480499.pdfIn PDF document text
    • http://homespakistan.net/magzine/uploadfiles/file/wixuzuvuw.pdfIn PDF document text
    • http://careerdynamic.com/clients/3/3d/3d9dba0a3645e5854abf1db7654b9c86/File/40896751980.pdfIn PDF document text
    • http://iaestedresden.de/userfiles/file/paluramodupawup.pdfIn PDF document text
    • http://www.aceitunasdelguadalhorce.es/ckfinder/userfiles/files/68214942507.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/s04e968n3535d8252bs5u41tq6/53910798302.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5fcf024c74a0d2af98eaf09346958004/pedipapuzemaliwixado.pdfIn PDF document text
    • https://syntellect.ru/Repository/file/73941886.pdfIn PDF document text
    • http://microcement.ua/userfiles/file/68351641165.pdfIn PDF document text
    • http://grupposcorcia.it/userfiles/files/gamozokilowasu.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/a0jnmuqkbbio98ggjfaufvnf12/85391318856.pdfIn PDF document text
    • https://rajatotogroup2.com/contents//files/tumamewetenuw.pdfIn PDF document text
    • http://ibtaker.ps/userfiles/file/13479404144.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4c1cce0990---38225569346.pdfIn PDF document text
    • https://facades-et-traditions.com/actualites/file/ruzafidexerow.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7dfc9156f99c51fd7e31c281b1217257/goneseba.pdfIn PDF document text
    • https://vpntraffic.com/upload/files/25283130785.pdfIn PDF document text
    • http://flightshop.jp/images/blog//file/21200312453.pdfIn PDF document text
    • http://helpibr.org/clients/f/fe/feaff840d005acecac0f151e8679c8db/File/rexurev.pdfIn PDF document text
    • http://smitheaster.org/clients/861344/File/xisamuwukim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=solar+engineering+of+thermal+processes+4th+edition+solution+manual+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_off0000fb12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB12 11320 bytes
SHA-256: e6d0423dde9674c2989d71d22c21bfabce2570d138c1edc5c20db8028ab7b761
font_01_sfnt_off00011545.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11545 17396 bytes
SHA-256: d4f8d4bac356cd0583de1f59a2612174200ab6b0fb6156d29c1e142e0a7f20e0
font_02_sfnt_off000142dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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