Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1726e342ebda417…

MALICIOUS

PDF

72.0 KB Created: 2021-09-06 18:36:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c0683ed42a22de93c050ad2fd5703bc6 SHA-1: df962576acb03c5fab43c14c371f06b168d830fe SHA-256: a1726e342ebda41735dd9152650a082f61e2135f380240a3255aec6a6541120a
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV with a 'Pdf.Phishing.Trojan' signature. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The presence of PDF-specific heuristics related to URI and link farms indicates an attempt to distribute malicious content or phish users by disguising the document as a utility for PDF conversion.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4393

Heuristics 5

  • 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
  • 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://olivierdaulte.com/ckfinder/userfiles/files/dapizopupewad.pdf In PDF document text
    • http://bright-mineral.com/uploadfile/file/2021081709443319.pdfIn PDF document text
    • http://sxhk365.com/uploads/file///ledisosapeze.pdfIn PDF document text
    • http://sinostandards.net/upload/files/juxovu.pdfIn PDF document text
    • http://dailymaydemtien.com/userfiles/files/vavasibomawarisabizik.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/i65ib6iublve8amsq95higtecv/vaduvefazofit.pdfIn PDF document text
    • http://namhungholdings.com/uploads/ckfinder/files/depube.pdfIn PDF document text
    • http://sun-tes.ru/files/file/xorapukebukusufida.pdfIn PDF document text
    • http://tingchucontrol.com/Uploadfiles/files/9359158145.pdfIn PDF document text
    • http://sanga.asia/userData/board/file/jumoxiputida.pdfIn PDF document text
    • http://lhs1965.com/clients/880801/File/32277727307.pdfIn PDF document text
    • http://ferrocom-spb.ru/userfiles/files/kalimasexefikogufudezix.pdfIn PDF document text
    • http://urjabatteries.in/userfiles/file/12052005210.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202105/file/xamog.pdfIn PDF document text
    • http://tygodnikzuzlowy.pl/ckfinder/userfiles/files/41085888102.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/9e602a914794c22cb18c720d9379becb/jofewomozoferowonekedexo.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/fe5d1723a0d6cb2f05d59315b67bdd0b/derodejumopaw.pdfIn PDF document text
    • http://baaningdoi.com/file_media/file_image/file/79101871184.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606da05393821---zopofado.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/20a5164a86f159ef2d51a96cb4f72193/tifokesaxelino.pdfIn PDF document text
    • http://sushibelovo.ru/files/29575621570.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/521a7e98c4b32b90c14ba6f7087288e9/61433728643.pdfIn PDF document text
    • https://feltshoe.com/userfiles/file/7905564335.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=convert+pdf+ke+word+bisa+di+editPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d51a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD51A 10860 bytes
SHA-256: fdca3a29128fe693729d7ff3bcf08de70fc85264b43831636802278dbce5ddc8
font_01_sfnt_off0000ee37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE37 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1