Malicious PDF — malware analysis report

Static analysis result for SHA-256 a42d1cdcef631086…

MALICIOUS

PDF

70.8 KB Created: 2021-09-25 04:50:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 850cab24e0b213ad4069f02aa24b499c SHA-1: 2fb4b4c0115ed0623026b583955ccef0d0851af8 SHA-256: a42d1cdcef631086dd82e84f17dae6612db1d3cb228087ba0304b6d6f1d921f3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.012 Process Injection T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The presence of multiple external URIs and link farm heuristics strongly indicates a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://archism.ru/uplcv?utm_term=the+simpson+hit+and+run+android PDF link annotation
    • https://stonebuild.bg/f/uploads/files/25269548960.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1612ea3f0da4fb---30279740366.pdfIn PDF document text
    • https://bloomlight.pl/_bloom/file/vafakutag.pdfIn PDF document text
    • http://evo-models.com/uploads/userfiles/files/67076351408.pdfIn PDF document text
    • http://castel.lu/userfiles/files/loneduwonewitopaguzisin.pdfIn PDF document text
    • http://355353.ru/userfiles/file/28065145197.pdfIn PDF document text
    • https://novamakine.com/upload/ckfinder/files/77906406544.pdfIn PDF document text
    • http://www.miyadenthai.com/image/upload/File/ralaki.pdfIn PDF document text
    • http://fskyok.com/uploadfile/files/defumij.pdfIn PDF document text
    • http://elsped.hu/files/file/peletofowulozakegavabu.pdfIn PDF document text
    • http://box8websites.com/ckfinder/userfiles/files/namiwasususere.pdfIn PDF document text
    • http://areaengineeringsrl.eu/userfiles/files/sitadewatoxinixogibipafa.pdfIn PDF document text
    • https://pensiuneaselina.ro/userfiles/file/jufaz.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/hijjeh0hebjsimpiigl8716hoc/mibuberemamorogijawu.pdfIn PDF document text
    • http://gldbirdgel.com/user_img/files/37250217132.pdfIn PDF document text
    • http://jlicentral.com/images/authors/file/zikuvodinokoboj.pdfIn PDF document text
    • http://lukoilmarine.com/ckfinder/userfiles/files/61832792976.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/161432c645a00d---69134036638.pdfIn PDF document text
    • https://lapalettedesarts.fr/gestion/file/kanozedoxifitejanusoguvu.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/161344c559c2ca---51997446725.pdfIn PDF document text
    • http://inbeeldt.nl/userfiles/file/serazo.pdfIn PDF document text
    • http://uniradioweb.info/userfiles/files/jeleb.pdfIn PDF document text
    • http://altera.ukrstroyka.com/content/xuploadimages/file/62608578359.pdfIn PDF document text
    • https://www.posluh.hr/ckfinder/userfiles/files/1015042896.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_off0000b308.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB308 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB1A 16552 bytes
SHA-256: 7a2a4db7c31d8fcc118f649c9cad90072f420ddf0cc61cd38203aaff5ac5389a
font_02_sfnt_off0000f51e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF51E 10676 bytes
SHA-256: a656660a9fc6cab7cd67e9a28541774cc2ca06199d6a768585a60c6d3154b9c9

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