Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7e7a64ffc1901ae…

MALICIOUS

PDF

89.2 KB Created: 2021-08-10 09:55:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 47d7e1ff3768c50b51c07f8b04525f46 SHA-1: 267d0a87cc69948b9f5a264c9f1578de7ae2fa5a SHA-256: a7e7a64ffc1901aee8626c1a4defe422f601512995a89c3f740d1c4c99b1939d
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, indicating a high likelihood of malicious intent. Heuristics indicate it functions as a link farm, with many URLs pointing to potentially compromised CMS upload storage or disposable hosting, suggesting it's designed to redirect users to malicious sites. The document body was unreadable, but the overall structure and URL patterns strongly suggest a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://finatwork.com/userfiles/file/mexidove.pdf In PDF document text
    • https://louvre.lv/res/wysiwyg/file/98778613657.pdfIn PDF document text
    • https://dursunguney.com/userfiles/files/9178857355.pdfIn PDF document text
    • http://lapenya.cat/imgjovesnaves/file/banunubewawomem.pdfIn PDF document text
    • http://patriabrno.cz/userfiles/files/kenulutedowetunotunu.pdfIn PDF document text
    • http://signexpowholesale.com/project-new/christianbook/upload_images/file/66877559473.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160822d997f043---tufevokopi.pdfIn PDF document text
    • http://qachs88.com/clients/58271/File/lekuwipugexutaranubob.pdfIn PDF document text
    • https://kermoulin.com/userfiles/file/73912495844.pdfIn PDF document text
    • http://armanetti.com/images/15835166371.pdfIn PDF document text
    • http://giayviettri.com/img-ftec/files/vipogiwuz.pdfIn PDF document text
    • https://manualismedicina.hu/fileok/file/64154760862.pdfIn PDF document text
    • http://ski-experience-japan.com/images/blog//file/11808807731.pdfIn PDF document text
    • http://mellorymotors.ru/admin/ckfinder/userfiles/files/zexipo.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1a229f18e2---papuzomizafitojulamog.pdfIn PDF document text
    • https://phuketwebstudio.com/ckfinder/userfiles/files/97011995934.pdfIn PDF document text
    • http://namjapizza.com/app/webroot/files/jonipedilajutilimibaralax.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/1od6dr7o6lot3dr9fcjnkmvj6a/95766273123.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/df247fa1ecaf2843989216c85a956b46/zaxazuvazuxadimotivodumo.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c330f292108---43587261387.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/601ae1fbcf61a14b7bb77c644135e967/busudof.pdfIn PDF document text
    • https://ahreco.com/uploads/news_file/sigisewekatoripaferax.pdfIn PDF document text
    • http://tremonttemplemacon.com/clients/862779/File/burujutezawawojijun.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=5+steps+of+grievance+procedurePDF 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_off0000fac5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAC5 10952 bytes
SHA-256: c04f89c26bff1c92913ce411c7bd5bb7e2499e52004054d173f731bcd142f9b2
font_01_sfnt_off00011427.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11427 16484 bytes
SHA-256: d41c6e5d36ff87707414d56a4181a63ca62a451b330d8f924ff9469de2307489
font_02_sfnt_off00013eb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EB9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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