Malicious PDF — malware analysis report

Static analysis result for SHA-256 11fc71b1e0215fc8…

MALICIOUS

PDF

100.0 KB Created: 2021-09-03 01:52:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 6e1eec998ef8be98765d10f162071c18 SHA-1: 9637a59fe815cc2b77520ded24aac5bc2a3dc312 SHA-256: 11fc71b1e0215fc8990b9a6d1d26647351569af5290b48b07c55e7a8d67beab3
164 Risk Score

Malware Insights

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

The PDF document contains numerous links, many pointing to compromised websites and disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were extracted, the structure and URL findings are sufficient to classify this as a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.ruben.pl/ckfinder/userfiles/files/2344059636.pdf In PDF document text
    • http://mnogonomerov.ru/uploads/file/73141835182.pdfIn PDF document text
    • https://machnhaduong.com/images/uploads/files/24379789207.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/b909b368e63159726761de0109d75f27/87817236890.pdfIn PDF document text
    • http://rideco.hu/upload/file/zofupoxevuwofirepulupoxar.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085723c8cfb0---68321243855.pdfIn PDF document text
    • http://leicesterbiketec.com/userfiles/file/mijafuwap.pdfIn PDF document text
    • http://richmediahouse.com/admin/uploads/file/tunatimapupogajo.pdfIn PDF document text
    • http://theemasternetworker.com/ckfinder/userfiles/files/46412008754.pdfIn PDF document text
    • http://hyundai-dongdo.vn/images/files/pamutedofowilifip.pdfIn PDF document text
    • https://phunhai.net/upload/files/xazukebexosun.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c942743e6b6---savijililunometuvug.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc71ba42cc9---golexigutikapus.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/7in7h2l0qfj2cbs0n6r9bj7l53/garavovunokadoludibesa.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f72fecc7c6---mupilosubepoza.pdfIn PDF document text
    • http://foto-recepty.sk/images/fotky/97072106196.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/4f4c7ae3c355234d427a7298d50d917f/jopirizamebeselipejemi.pdfIn PDF document text
    • https://mmszke.hu/files/file/6725131721.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/442e82705d1b33edde04d08ecab4309c/nusegufotesi.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8979337bdb---dovalep.pdfIn PDF document text
    • https://unicornproduction.gr/wp-content/plugins/super-forms/uploads/php/files/f7a90c05364f7d5fbece4168a179246c/waxewu.pdfIn PDF document text
    • https://promise-land.com/upload/file/91188594605.pdfIn PDF document text
    • http://gesundimjob.at/images/content/files/30244978711.pdfIn PDF document text
    • https://mavibusiness.it/file/redejifasuvanovivalur.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=manual+de+propietario+chevrolet+captiva+2009PDF 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_off00011860.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11860 21124 bytes
SHA-256: af4a093b265cf6246fcb08eef237ebda8a6f465b1f0b09f336747cec5b705346
font_01_sfnt_off00015057.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15057 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001686e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1686E 11012 bytes
SHA-256: 4e963b0d367a31a1cffa2cd45ca3452123061a2dddd356f153f1342cafa85906

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