Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d74fe1b06f0fa39…

MALICIOUS

PDF

75.0 KB Created: 2021-08-01 12:46:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a6f9f7036e4b81041870d5bc46f3a768 SHA-1: df2ee56798c9ff92b176bc8f2932e9f8f7bf1508 SHA-256: 0d74fe1b06f0fa3968d7099ed9a44be8adfe00837ebc0784eb4cbba360871db3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The embedded JavaScript and numerous external URLs, many hosted on compromised CMS platforms, suggest it functions as a link farm to redirect users to phishing or scam sites. The primary technique observed is the use of embedded JavaScript to facilitate these redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://krisoc.ru/uplcv?utm_term=corydon+hammond+handbook+of+hypnotic+suggestions+and+metaphors PDF link annotation
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/ec869c7d4e36c01e1c4b5762a2b8421e/80812551994.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/1dd262d19f584582e7284fd014ac8cc2/doges.pdfIn PDF document text
    • http://showpalmedical.com/userfiles/fofurogivufotitud.pdfIn PDF document text
    • http://www.kotolantopeni.cz/files/zonofow.pdfIn PDF document text
    • https://snpwachq.com/files/js/ckfinder/userfiles/files/xodes.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-5-13/20210513002221621942.pdfIn PDF document text
    • https://wavesmaroochydore.com/wp-content/plugins/super-forms/uploads/php/files/d6ang8lbmgab9u5hb82h7cnthg/32926476105.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb7c1b1061d---91661805629.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/0d537f2eb617f66c2248171955c8bf06/84504526449.pdfIn PDF document text
    • http://fine-trading-knotwork.de/uploads/media/zusovamupefaziwimubera.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083b34d84036---fedofumabefekowemol.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cabce7476c---vitobis.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160780378bb9a6---11476688116.pdfIn PDF document text
    • https://cottonweb.net/userfiles/file/60559972562.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160965f517d9b8---nipepatawawus.pdfIn PDF document text
    • http://ydtmuhendislik.com/ckfinder/userfiles/files/91984981678.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/b3tgmndh0uhriouoscmpo4u8o2/47495525540.pdfIn PDF document text
    • https://lacecinella.com/writable/public/userfiles/file/78422370923.pdfIn PDF document text
    • https://10glazsikeyrosa.ru/file/sivesudiwepipelefonefudez.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/a302cfb0bf49ea81628beff34fdfdb97/21092206448.pdfIn PDF document text
    • http://haus-st-otmar.ch/userfiles/files/juduxi.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bed4964e901---21302298578.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_off0000bf52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF52 16372 bytes
SHA-256: 0d2823d19bc7a4480ac51b9fd26eac5ef718a725fcec61805be62ecde5ff77c6
font_01_sfnt_off0000ea5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA5D 11500 bytes
SHA-256: d076c2bd0b9e5ef6986d7c5f3a23aed01d0dc9074087408aca163db0396dd3ca
font_02_sfnt_off00010504.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10504 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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