Malicious PDF — malware analysis report

Static analysis result for SHA-256 faba195e38eda613…

MALICIOUS

PDF

89.2 KB Created: 2021-08-11 14:31:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f21ee4659fd2bde3ce6dd6d7244a7f59 SHA-1: 63bc6ecda4689d427830f14b7b4f0b9dc4482be7 SHA-256: faba195e38eda613b1d6713a5e9f3d1950d88081cb52056d7d5a9cdfddc8bff0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised websites or disposable domains, indicating a link farm designed to lead users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the nature of the embedded URLs and the heuristic firings point towards a malicious document, potentially delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://geostudio.eu/userfiles/files/jizanoj.pdf In PDF document text
    • http://apexibd.com/uploads/fck_uploads/file/rikedejusizav.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/f3334adc991f4f0639fbd210f2439a50/muxidalonorisalibi.pdfIn PDF document text
    • http://wsmr.us/userfiles/file/rijugokonimavev.pdfIn PDF document text
    • http://holmeslawfirm-iowa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wuzodefuvifipikotixef.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/27d095165b3cb123d2748f3f6d3eaf9b/badowogevujuzakakotu.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160783e0735824---22214759335.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/64c2932c2ca3b23bae8a7619a6807000/67034876756.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c184bd285e6---96963597773.pdfIn PDF document text
    • https://abugfreemind.com/userfiles/file/velasitakovuki.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160f8dd43652a6---93031635527.pdfIn PDF document text
    • https://gerastar.com/userfiles/file/98570793491.pdfIn PDF document text
    • http://agroanaliz.by/upload/editor/files/sepebatepatowujojaxeseg.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/1980b9d6ab835e387f911ce54f41abc7/visulujepukirekaxilen.pdfIn PDF document text
    • http://bluekeydigital.com/images/pic/file/28265523034.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/bebc8b5cba8fc9019fb4c93d0ba244c3/5480551543.pdfIn PDF document text
    • http://iworking.vn/uploads/files/6805145295.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f08637cc8be---98772852051.pdfIn PDF document text
    • https://bitree.ru/ckfinder/userfiles/files/vedufijatajeraxed.pdfIn PDF document text
    • http://backkwang.com/userData/board/file/33915867570.pdfIn PDF document text
    • http://xiaohecollege.com/d/files/nobapajavobuja.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608eb1788fab5---loropudinipebo.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c6debe47b4---64882118560.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16098fa9f82a57---71568711731.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=what+to+eat+after+the+10+day+green+smoothie+cleansePDF 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_off0000f6d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6D9 17048 bytes
SHA-256: db0a43001e6ddca54f8baac853a2f66c92d51d7174c619ccd2fd8b91de4db050
font_01_sfnt_off00012355.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12355 11204 bytes
SHA-256: ab1a6357e2e1716aa97c2a0ff5eac96aa775a9f8f4bdc3ba6ddf80a0b10d8307
font_02_sfnt_off00013d45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D45 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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