Malicious PDF — malware analysis report

Static analysis result for SHA-256 e709cbc0d7ef2901…

MALICIOUS

PDF

77.0 KB Created: 2021-10-12 15:21:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 65f70764a03e9220eea61ebee39c6228 SHA-1: 9ccc449b34bf0fdf2cdd06e80e6c0a999ba8b462 SHA-256: e709cbc0d7ef2901a3602a658d3f2e5316e505188421c672837dd1a228f7ca7a
154 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to distribute malicious content or phish users. ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature. The ML classifier also flagged it with a high score.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7561

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://synowka.pl/galeria/file/4152519786.pdf In PDF document text
    • https://equinox-e.com/upload/files/bojesak.pdfIn PDF document text
    • http://zhfangyuan.com/uploadfiles/files/bubisufaxasajawapora.pdfIn PDF document text
    • http://asbufestival.com/uploads/FCK_files/file/butuxigiwu.pdfIn PDF document text
    • https://www.singaporemedicalclinic.com/ckfinder/userfiles/files/20879444906.pdfIn PDF document text
    • https://eurosan.pl/user_images/file/88938228013.pdfIn PDF document text
    • http://a899.net/userfiles/file/xobimafubesusakap.pdfIn PDF document text
    • http://bagliodeimille.it/userfiles/files/xelevopenubanopigaxinil.pdfIn PDF document text
    • https://angelsforwarriors.org/userfiles/files/xixuvolupetuzutebe.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/cntpnb2ep1rbbin9uk8dk2h8u4/xibogasilezuj.pdfIn PDF document text
    • http://darec.sk/files/files/nekedijaxatonulixudelikib.pdfIn PDF document text
    • http://vitccorp.com/uploads/userfiles/file/50432987421.pdfIn PDF document text
    • http://share-world.tw/userfiles/file/60859761745.pdfIn PDF document text
    • http://tongkhomica.com/upload/files/nitinadefusojudir.pdfIn PDF document text
    • http://onmamtour.com/FileData/ckfinder/files/20210912_7CD4C7B344DB0DAC.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/16160fa2a1327e---5132172636.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1614cc8c7073cf---nizijopafaloxosir.pdfIn PDF document text
    • http://polyacer-ecp.com/userfiles/files/20210915_091755.pdfIn PDF document text
    • http://websteravelandscaping.com/editorData/file/tumapura.pdfIn PDF document text
    • http://auswallendorf.de/userfiles/file/visuvowupeku.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/dumovavapemitoviwonalaxof.pdfIn PDF document text
    • http://toyotacri.com/userfiles/files/40392184223.pdfIn PDF document text
    • http://coreaad.com/DreamDataUpload/file/37306002048.pdfIn PDF document text
    • http://chayka-svg.ru/files/83733238166.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/cmwvf4RlXg4/uplcv?utm_term=beautiful+background+design+for+powerpointPDF 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_off0000e1a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1A7 11264 bytes
SHA-256: d4f666a2b85c9d2d5e85602be37841b09564b2fe8d53d4e6e074256134c772c4
font_01_sfnt_off0000fbdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBDB 19608 bytes
SHA-256: 32676917d252b9fbc6870ecc96ae90cd5a8154ebd44d6ee313a642bab5056e96

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