Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e5c48ee792aab49…

MALICIOUS

PDF

87.7 KB Created: 2021-09-21 16:07:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: de52fbfe549ff00e92a91d1489b32bed SHA-1: e849aac44c812ad30d2415322fdd7307907d13a5 SHA-256: 5e5c48ee792aab49fe9abb52229e4c9161c2a93b727f9de6052d1635b7b7b7cd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised or disposable hosting sites. The presence of numerous external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly suggest an attempt to distribute malicious content or phish credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://daehnfeldt.com/userfiles/file/nufubukuzufalipupuza.pdf In PDF document text
    • https://amigo-shop.105h.net/upload/files/71356081167.pdfIn PDF document text
    • http://precedent.by/_newsite/images_from_html_editor/file/borirebekikuvewen.pdfIn PDF document text
    • http://www.ags-sib.ru/ckfinder/userfiles/files/sifanunobamitebuxe.pdfIn PDF document text
    • https://navoloki.mebel18.com/uploads/files/jasakaregodevifuvisuje.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161335c860e4cb---defekorajiladidopi.pdfIn PDF document text
    • http://arkystudio.eu/userfiles/files/selugugo.pdfIn PDF document text
    • https://www.playitdirect.ca/ckfinder/uploadfiles/files/gekekitivixow.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/161329eec936d9---sawinakedamag.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/7lbqepidt0rq8rp3gaqpe7cmq5/sojagumavigojovuveferiw.pdfIn PDF document text
    • http://martonaroniskola.net/userfiles/file/17082990516.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/kbhfqkg8g0naedc7in3gbf301p/japetofedada.pdfIn PDF document text
    • https://soudurelausiere.ca/upload/editor/file/gozezusubuwuge.pdfIn PDF document text
    • https://kirbas.com/img/uploaded/file/1520499991.pdfIn PDF document text
    • http://chapelguild.com/images/usr/10589130415.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/a4d84338efca24d9832026909436ed1e/vesofefutab.pdfIn PDF document text
    • https://benmoonpharma.com/userfiles/file/54847090355.pdfIn PDF document text
    • http://sochi-vitrazhi.ru/ckfinder/userfiles/files/40949389621.pdfIn PDF document text
    • http://grasslandtj.com/upload/files/xoropemudogimalas.pdfIn PDF document text
    • http://dreesmann-foto.de/userfiles/file/72187846797.pdfIn PDF document text
    • https://sibconsulting.com/contents/files/figoxupuxaverojute.pdfIn PDF document text
    • http://personal.sut.ac.th/chantira/port/ckfinder/userfiles/files/dakugigomemodupafotexerup.pdfIn PDF document text
    • http://straps.by/ckfinder/userfiles/files/49512283887.pdfIn PDF document text
    • http://www.motocams.cz/ckfinder/userfiles/files/36590676013.pdfIn PDF document text
    • http://stefanourso.com/public/userfiles/file/dapifonorusot.pdfIn PDF document text
    • https://funke.be/data/file/menizatu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=android+phone+freezingPDF 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_off0000f20f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF20F 10344 bytes
SHA-256: 426dc572eb44914c8f74cbcec0895ed2da5c021971b247c9511180e7542cf65b
font_01_sfnt_off00010917.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10917 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012129.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12129 18656 bytes
SHA-256: 52f122e3db08b5eec5f8a47ad50bcc3d86ec0ebd4719743d45579790a9f0aa73

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