Malicious PDF — malware analysis report

Static analysis result for SHA-256 76c466f0e8fbfc02…

MALICIOUS

PDF

82.0 KB Created: 2021-09-17 03:23:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d112835e2a4f6d0ed7092b2808f73b3f SHA-1: 7a294e2bfdd974db8380226062ebbfcfb84a8afb SHA-256: 76c466f0e8fbfc02e2f61f4aef4450bec798cdba588e192f1df32586445b3c78
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites, 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 explicitly extracted, the PDF structure and URL patterns are consistent with phishing and malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/fu5qpq0jauipkeuqceh8ft632e/61930945169.pdf
    • http://chelseacarpet.com/ckfinder/userfiles/uploads/33854530804.pdf
    • http://peak-experience-europe.com/images/blog/file/rimanadibiwepizekadutor.pdf
    • http://mwcapital.net/ckfinder/userfiles/files/61243274827.pdf
    • https://redac.ch/upload/98089321732.pdf
    • https://medbioplast.com/klucharnet/images/file/65552981139.pdf
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ef811db921---60002721678.pdf
    • http://eqletstalk.com/uploads/files/202109010956546823.pdf
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/df53f9e92af7f1332aea678d9069a4aa/bikenikiwerexamira.pdf
    • https://bistakalikotenetwork.com/userfiles/file/40001805046.pdf
    • https://kurishupally.org/userfiles/file/nidoxiro.pdf
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/6ngrjaau5mf1q8sq4obg1oovkt/vuriwukewabelefebubumole.pdf
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613db6820efe6---9225217007.pdf
    • http://musicpark-live.de/userfiles/file/11314254982.pdf
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161360536a9883---98001556480.pdf
    • http://thecargonepal.com/userfiles/file/tikejajisenumus.pdf
    • http://posicert.com/upload_fck/file/2021-9-17/20210917081209220108.pdf
    • http://yonseri.org/userfiles/files/noxab.pdf
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/92258567be7c39cf4969c3663c19ba19/60873637021.pdf
    • http://kolkandkolkdesign.com/site/data/ws/files/43365750859.pdf
    • http://elandtour.com/FileData/ckfinder/files/20210901_BB9CF071ECFFC2B3.pdf
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613245aa2b8f3---vugozifeganejev.pdf
    • https://postelezmasivu-liberec.cz/ckfinder/userfiles/files/lupemokufosaxena.pdf
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/16143daf8b353b---70440308583.pdf
    • https://charterfori.ir/basefile/charterforiir/files/momivaratizefawog.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=five+nights+at+freddy%27s+4+free+play
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dbd2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDBD2 16792 bytes
font_01_sfnt_off0000f3e4.bin
b99516ee9f4e28008e087df5bd9ebd9c37b73ea18388745cc6fce341155e9811
pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E4 17176 bytes
font_02_sfnt_off000120a5.bin
451f6c3c07fb57828a3dc2f8c3413e38ee64ad399ef634cbb1d84944d0424083
pdf-font-stream PDF embedded font (sfnt) at offset 0x120A5 10928 bytes