Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f8366d98d87c015…

MALICIOUS

PDF

78.4 KB Created: 2021-09-05 21:55:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5c8a9f4d8254bc8591d1b2161d3bdadd SHA-1: e435af603ca21996cae41d8e5e24a978e89cb310 SHA-256: 1f8366d98d87c015f7ce44627bc878236a43732517acf009eddd680d510f3289
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely involving the execution of embedded JavaScript to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://infrive.ru/uplcv?utm_term=life+of+pi+book+pdf+download PDF link annotation
    • http://millecolori.it/images/file/70224532169.pdfIn PDF document text
    • http://alexandersorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/30631381797.pdfIn PDF document text
    • https://termofriz.rs/files/51315688067.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dda5bc1ab1d---vofemabekuduluzisunowa.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfa3e2dc66d---forumekorebovowet.pdfIn PDF document text
    • https://study-abroad-travel.com/ckfinder/userfiles/file/madidu.pdfIn PDF document text
    • http://keyflounge.nl/userfiles/file/10882510713.pdfIn PDF document text
    • http://worldcar.jp/userfiles/files/gixujinazewumoxirogudinem.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/16082f0f6623a3---nojerarut.pdfIn PDF document text
    • http://toshiba-center.ru/uploads/files/fomamokimefejuvujis.pdfIn PDF document text
    • http://georgekoldun.com/var/upload/file/92168337268.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/2e49a1a7e1c2d07f8a1ca58e0bd081e8/78344286820.pdfIn PDF document text
    • http://bijverhoeven.nl/uploads/files/xivululorekonevege.pdfIn PDF document text
    • https://activepymes.com/pub/file/4345586279.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/4r1dh47eamb5dam92fgp0r3f6g/zolokovogunevabaje.pdfIn PDF document text
    • http://pitin-akutsu.com/js/upload/files/gisitetanoxizovoxagotefuz.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608351b738cd7---79323822612.pdfIn PDF document text
    • http://kinel-hunter.ru/upfiles/file/dejiwexufemib.pdfIn PDF document text
    • http://nakakinpump.kr/fckeditor/upload/file/4317452965.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/47899552121.pdfIn PDF document text
    • http://abbwingslynnhaven.com/uploads/files/18332347501.pdfIn PDF document text
    • http://fincasotilloviejo.es/files/sotillo/_repo/file/radalofosokebosewija.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a89519d7b6a---wigavonelogiwisefereza.pdfIn PDF document text
    • http://sarljarry.com/userfiles/file/77867310158.pdfIn PDF document text
    • http://pattersonandoliphantfamily.com/clients/875492/File/nujozarifid.pdfIn PDF document text
    • 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_off0000cc2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC2F 18560 bytes
SHA-256: d949243258ef7c3825c16e22f99ac17eb021b77cda9dcd1931e59af4ee0bfe5e
font_01_sfnt_off0000fc3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC3A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011451.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11451 10400 bytes
SHA-256: 37aaf0f33c03777da8388aa020d495dc4a73f2cb2b58205db1c2bd9862f75a83

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