Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf05283bcb43e2d3…

MALICIOUS

PDF

82.8 KB Created: 2021-09-10 15:31:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b044268be0d1fc9be98026fe0b2d9d62 SHA-1: fdb6e8926444cf4d54748795644d9b91f8608f29 SHA-256: cf05283bcb43e2d33af1026a6f18956c2882f9f157b7cba507bc0a8a1a9bbd7c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal embedded JavaScript and a significant number of external URIs, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded JavaScript (T1059.007) further supports the potential for malicious actions within the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://huntic.ru/uplcv?utm_term=whyte+vs+povetkin+live+stream PDF link annotation
    • https://jbdclothiers.net/emailer/userfiles/file/jamililurupinanolefi.pdfIn PDF document text
    • https://bishopsalamatkhokhar.org/userfiles/file/pajukanopuraga.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/161314f607a78c---xofesa.pdfIn PDF document text
    • http://rama-sp.com/rama/webroot/js/ckfinder/userfiles/files/gidepivadamaguladelix.pdfIn PDF document text
    • https://chinese-wall.tw/upload/files/kozibinugunagugo.pdfIn PDF document text
    • http://pokorny-podlahy.cz/UserFiles/File/zazim.pdfIn PDF document text
    • http://nmways.com/uploads/fckupload/file/zilajorimiragelolape.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/f4ip3da5hfhp4q2ha7umssdnp7/laruni.pdfIn PDF document text
    • https://foundationkuzmanov.com/files/xaxefudulilakoj.pdfIn PDF document text
    • https://www.bbmnetlicitacoes.com.br/cms/ckfinder/upload/files/72132593482.pdfIn PDF document text
    • https://walkandsmile.com/userfiles/file/71405010358.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/82c5c818076b9a5304097e697ea53b7d/jubujefumanabesigekigo.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/16134feef787a1---tujeragawosixedu.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134d49268592---xejifibomigokepimoji.pdfIn PDF document text
    • https://repetitorebi.ge/userfiles/files/ranivol.pdfIn PDF document text
    • http://saraswatishikshamandir.com/singhania/downloads/file/60838115764.pdfIn PDF document text
    • http://www.koeru.eu/failid/file/50911343941.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/buzikobinujupuzu.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1612fc4da63a69---tuvuwowemijofevadudafe.pdfIn PDF document text
    • https://emmaushuis.org/pages/61413344004.pdfIn PDF document text
    • https://quatcongnghieput.com/uploads/files/25618097417.pdfIn PDF document text
    • https://grupahatak.pl/admin/_fck_files/file/76478573728.pdfIn PDF document text
    • http://stavclearing.ru/upload/files/vidimezo.pdfIn PDF document text
    • http://barsugo.com/ckfinder/userfiles/files/garemuganawoli.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/161345d82d6d04---60601643298.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_off0000dcf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCF9 10784 bytes
SHA-256: a9ea8b79f018e4f5edd35601fb448741cfed4f7ea61eb4bf6f18016d81a6da64
font_01_sfnt_off0000f5b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010dc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DC4 18012 bytes
SHA-256: 73ea7e380d36ae4463bdab72af9ec779f174e5fda6a15f6b18f009c5c3aad2bd

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