Malicious PDF — malware analysis report

Static analysis result for SHA-256 798d73cd9c6f3b6c…

MALICIOUS

PDF

102.3 KB Created: 2021-07-08 12:46:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 35e0c07561add9aab128d0d8142a7b0c SHA-1: 8678da0bd7aa7a7fba278160b5ca5fc13d93d8e0 SHA-256: 798d73cd9c6f3b6c1b9e8341f6ab299955de22dc7144c969e77b796ce0a9372c
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high probability of malicious intent. It contains numerous embedded URLs, many of which point to compromised WordPress sites, suggesting a link farm used for phishing or malware distribution. The presence of these links and the detection results strongly suggest a malicious document, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9790

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://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a8a112d6018---10451210959.pdf In PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609538376d798---sikopixopube.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076bc311e9ab---42726087562.pdfIn PDF document text
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/e0qc4mtttcq1mkatmb02c8umu3/welejibonemitesuzogalabu.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/29277782c63fad329ad0132fa02c0731/31146265801.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/16094e24859669---tagusofidoma.pdfIn PDF document text
    • http://security-m.jp/tool/images/file/32175050360.pdfIn PDF document text
    • https://bompentax.com/quangbasanpham/app/webroot/upload/image/files/5993870246.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160962fabbc9be---kimamesagowafexarewotifof.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160779d65cfcb5---84467021761.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/37485047704.pdfIn PDF document text
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d9fd63388d---66290853461.pdfIn PDF document text
    • http://namlongprojects.com/images/uploads/files/rizolorazagewamefudotu.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f36f55d7f0---fekinimototigemovikeja.pdfIn PDF document text
    • http://parcfamilyreunion.com/clients/b/b3/b3ae52aef0329bb57e848b27182677c8/File/4629394278.pdfIn PDF document text
    • http://biswasi.com/userfiles/files/gijodujuwiwagew.pdfIn PDF document text
    • http://pmteventures.com/clients/5/57/576e8e71b788aac95a268099fab76a3d/File/bosepegizupezesokefuj.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160abdb308809f---16262619561.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/nrc14f5n78v4ivh8t7hlo7a9dn/66595658441.pdfIn PDF document text
    • http://amandatravel.com/userfiles/file/fopaxofupamo.pdfIn PDF document text
    • http://cukiernia-waltar.pl/qcms/userfiles/file/34708141826.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-6-12/20210612231651524631.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/tr6ud1jhsmkl44eq55dvhl8rl7/95182490185.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/93099110015.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/8k43jqdmjefsjjiv337517j792/sujuxagido.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c96205ed143---73751389976.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=the+language+of+anatomy+review+sheet+exercise+1+answer+key+13th+editionPDF 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_off000126b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013ec7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EC7 18648 bytes
SHA-256: aef7fed44f76a00c4b6d704e7099b56aabc0c455014779154c8739313bd0be50
font_02_sfnt_off00016f6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16F6A 11672 bytes
SHA-256: d9404d73db4daaac6b8286d29fc92f1d44a0c4967f955c63a458526438baa46d

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