Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc9f0fc88d9d07e7…

MALICIOUS

PDF

75.9 KB Created: 2021-09-03 11:52:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d844d8719bf5d38995b126834d50e287 SHA-1: 166a8ee374aa0bdbd605baa2193385ede9fdfb9e SHA-256: bc9f0fc88d9d07e7b735ac5a7d0fd82731983721599cdad817864a15556e6a71
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains numerous external links, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly indicate malicious intent. Although no scripts were explicitly extracted, the nature of the links and the PDF structure suggest it is intended to redirect users to malicious sites, potentially for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://cructi.ru/uplcv?utm_term=identifying+prisms+and+pyramids+worksheets PDF link annotation
    • http://h-st.nl/bestanden/files/fegafuduwapade.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/c920ce2ae7632f01df47aee371c1efc3/25222512115.pdfIn PDF document text
    • https://bamfieldrental.com/userfiles/file/48843035047.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1cea67d27c---89594932249.pdfIn PDF document text
    • https://idd.no/ckfinder/userfiles/files/54069036883.pdfIn PDF document text
    • http://charivne.info/images/file/35881174559.pdfIn PDF document text
    • http://tensoinox.com/userfiles/files/mufemasezudu.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160779450dddf3---21810816969.pdfIn PDF document text
    • https://www.llgnjinc.com/wp-content/plugins/super-forms/uploads/php/files/0f43abada0e0e3d87208dc99da5b821c/julaximajabebopod.pdfIn PDF document text
    • https://protectname.xyz/whoisprivacy/userfiles/files/mabalifuwimimukokegi.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/160753aa970142---82866975455.pdfIn PDF document text
    • http://willettelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xudomuzun.pdfIn PDF document text
    • http://istihdamhaberleri.com/upload/ckfinder/files/jimor.pdfIn PDF document text
    • https://instalacje-elektryczne.net/ckfinder/userfiles/files/47379649889.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160b0eabc44e2d---vuxazebelenuzapo.pdfIn PDF document text
    • http://galgalesh.com/userfiles/file/mubarurejanonenukugajub.pdfIn PDF document text
    • http://dungcucaytrong.com/images/files/xupuf.pdfIn PDF document text
    • http://pwr-tech.ru/userfiles/file/fefoninufaju.pdfIn PDF document text
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/93caf744498c4b381fec5a63daa5c926/46765234790.pdfIn PDF document text
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/bbc77041ee9508abf77a5198e492499e/pojibikuximoru.pdfIn PDF document text
    • http://orsini-blasioli.it/userfiles/files/37911124846.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/v3ige566g6c6eo63pu12o3bu23/werijenudararipitawiku.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/fb38fa8b6tv4t2f7n60oe4cac7/32470109303.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/cad5e7d3e39f07882161af1cb985740c/fajog.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_off0000c612.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC612 16484 bytes
SHA-256: 8ceb41713fdc5b3d096cf724f14563a1b847e9fb6ffe238a9ef8d7e8c0b3d821
font_01_sfnt_off0000f029.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF029 11144 bytes
SHA-256: 669d018cbec6c79d6e99afbf3e8b04190890707d381914d7acfb49f360b6cb10
font_02_sfnt_off000109de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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