Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfa06a464aba0297…

MALICIOUS

PDF

78.7 KB Created: 2021-09-06 15:23:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 25c3498c9961483a7ce8e85e08b293cc SHA-1: 0ea159dcdb5ce9c468fa4e7f5f85dcc3f11cb4ad SHA-256: cfa06a464aba0297cd14ca1a6928426e3b78afd940c492ef0eebc65b5e92d58e
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised websites or disposable hosting, indicating a link farm used for redirection. The 'SE_LOLBIN_RUN_COMMAND' heuristic firing suggests the document text may contain commands or URLs intended to be executed or visited, such as 'curls.se/upload/file/34534125944.pdf http://mesahighclassof6'. ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature, likely serving as a lure for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://diamantina-joaillerie.com/ckfinder/userfiles/files/35216159461.pdf In PDF document text
    • https://prcomponents.com/ckfinder/userfiles/files/zibidesewupezikoredut.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/q2pabi5i8uj1vr7rikc0r8e4gu/21542876979.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/e2777f3c872107fbf6c343ca137e706b/mitobunudukatorodixobos.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a17bcb31690---81275406299.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/62bdf3d170e7ceb6e2d444ad86b131ff/43459738843.pdfIn PDF document text
    • https://bititechnika.com/uploads/file/28843267488.pdfIn PDF document text
    • http://th-hl.com///upload/files/33308602336.pdfIn PDF document text
    • http://geredekombiservisi.com/userfiles/file/41673529026.pdfIn PDF document text
    • http://nw-line.ru/generic/uploaded/ginizabufusumagu.pdfIn PDF document text
    • http://charmingcurls.se/upload/file/34534125944.pdfIn PDF document text
    • http://mesahighclassof63.com/clients/79820/File/lusasuvitudimusedepez.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160e97e6d68700---tikapigapuwe.pdfIn PDF document text
    • http://dh-cell.net/ckfinder/userfiles/files/lurorosapa.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/sfotq1kb09e67t6fad3gjc5bt0/gijifigalo.pdfIn PDF document text
    • http://suachuaspa.com/upload/images-content/files/51082927785.pdfIn PDF document text
    • http://sola-brothers.com/userfiles/file/38605463292.pdfIn PDF document text
    • http://atenngo.com/admin/sites/site/documents/tofanabajavitezure.pdfIn PDF document text
    • https://bda.ch/ckfinder/userfiles/files/webafunovapaxabate.pdfIn PDF document text
    • https://pnlcoach.com/misc2/file/In PDF document text
    • http://trendstyleimage.com/uploads/ckfinder/userfiles/files/39226187980.pdfIn PDF document text
    • http://fresh-j.info/images/uploadedimages/file/bavefirixaxelizago.pdfIn PDF document text
    • http://mesahighclassof6In macro / runtime command snippet
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=corporate+governance+and+human+resource+management+pdfPDF 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_off0000d146.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD146 16404 bytes
SHA-256: 16d73a15f38343ed2a8a3daa146eb1d509268adb2e1a7c5224ccc400f680ddc1
font_01_sfnt_off0000fb75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB75 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001138c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1138C 11124 bytes
SHA-256: 9407f804ecabc23fd9d1d6c6e754ab93de7de1c5d3d52ec5e1c195d6ba93c501

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