Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6040e15c35cc0c1…

MALICIOUS

PDF

84.3 KB Created: 2021-09-15 09:22:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d60ee20726de17ed566f0519469e4907 SHA-1: d3dd7e62d6ff5b7a4b1c804b845ff79daf7c1f86 SHA-256: a6040e15c35cc0c1c0f08f50f97b74a33a5169b71a85a5bf2fa8166baf10fa52
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, suggesting a link farm designed to lure users to download potentially unwanted or malicious software. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://crescentcarpets.com/userfiles/file/bijabuveborarobokeviga.pdf In PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161413ed88fee4---44747044290.pdfIn PDF document text
    • https://www.bosingels.nl/ckfinder/userfiles/files/zapixaruribukikujodabujag.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161411dee8cdf6---21876289346.pdfIn PDF document text
    • http://odpadykj.cz/UserFiles/File/95420464992.pdfIn PDF document text
    • http://owop.challengersports.com/ckfinder/userfiles/files/68057200357.pdfIn PDF document text
    • http://malbreil.com/userfiles/file/dawimowinugiwakazu.pdfIn PDF document text
    • https://thisissati.com/userfiles/files/musatudo.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/files/64624041208.pdfIn PDF document text
    • http://springgalleryng.com/Images_upload/files/pifafopezeropuxokelogaze.pdfIn PDF document text
    • https://livbiopharma.com/userfiles/file/vemibiwelu.pdfIn PDF document text
    • https://parkettworld.com/upload/files/62741254851.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/161413928ccf61---58356916477.pdfIn PDF document text
    • https://episcopiaoradiei.ro/files/kajakejawokuroluz.pdfIn PDF document text
    • http://xn--oy2b19v1mb1yi.com/userfiles/file/punedirenot.pdfIn PDF document text
    • http://evaemlak.com/userfiles/file///94491418275.pdfIn PDF document text
    • https://etonbio.com/newsLetters/images/file/valenoziraxowud.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a3dcb3947d---tanixopos.pdfIn PDF document text
    • http://fohow77.ru/upload/file/zafaluratepetux.pdfIn PDF document text
    • http://wuxihemei.com/ckfinder/userfiles/files/20210908_004914.pdfIn PDF document text
    • http://goldmustang.ru/files/files/tamepe.pdfIn PDF document text
    • http://kozszemle.hu/uploads/files/72566584745.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=html+notepad+for+android+apk+downloadPDF 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_off0000e2be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fad5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAD5 10660 bytes
SHA-256: 418e0eb611b26175cf761366632e52417e957c929b70ba0394241a80b50f9cec
font_02_sfnt_off00011328.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11328 18700 bytes
SHA-256: d5e8cc861604be15d5be86f0d1e39899574cf27d2a0e4ab766144e7f3e767fd0