Malicious PDF — malware analysis report

Static analysis result for SHA-256 93379d0a206a6cc0…

MALICIOUS

PDF

69.3 KB Created: 2021-09-16 13:51:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-03
MD5: 946ba0203d60ed99b6abc1cbf963a773 SHA-1: ec6d82df25e38c32296debbf64e812caba9e81d3 SHA-256: 93379d0a206a6cc05ac4d9c2e52754239542b7aa6df4b33fa3ffd87f8aae4f5b
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable, so the rationale is based on the URL analysis and heuristic firings.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4539

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://sarna-zapiekanki.pl/ckfinder/userfiles/files/66295811202.pdf In PDF document text
    • http://agriturismoilnoceto.com/userfiles/files/wajun.pdfIn PDF document text
    • https://simondaulte.com/ckfinder/userfiles/files/mosigalafubima.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134b9239a70a---22673725355.pdfIn PDF document text
    • http://zzzwchem.com/upload/files/68104309648.pdfIn PDF document text
    • http://theflowermaker.com/uploads/File/vibodajavemuvo.pdfIn PDF document text
    • http://pravkniga.ru/files/userfiles/files/53859118077.pdfIn PDF document text
    • https://thietbixanh.net/uploads/files/gumipe.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/39eovd6thqgglhrfekf4c7dth6/vimogaxip.pdfIn PDF document text
    • http://sun-green.eu/ckfinder/userfiles/files/vasimavogelevupufob.pdfIn PDF document text
    • https://hocaukhudothithanhphogiaoluu.com/asset/site/files/wokojadow.pdfIn PDF document text
    • https://vantainoidia.vn/ci/userfiles/files/68029149801.pdfIn PDF document text
    • http://oishisushigd.com/uploads/files/zivawinotonetexozoziw.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/86e995dc858757c58494333aae38aa0f/xivapeka.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135772bbe458---58946807373.pdfIn PDF document text
    • http://mzch.pl/userfiles/file/57491605652.pdfIn PDF document text
    • http://club-integra.ru/userfiles/file/25648650095.pdfIn PDF document text
    • https://pemaboutiquehotel.com/assets/userfiles/files/bogewe.pdfIn PDF document text
    • http://livestocktool.com/d/files/kodul.pdfIn PDF document text
    • https://mlspoland.co/files/file/takip.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/161346bb766f53---11103392557.pdfIn PDF document text
    • http://mertcelikkapi.com/userfiles/file/92003852298.pdfIn PDF document text
    • http://machin.kr/userData/board/file/gofexepuwaterisogufilapi.pdfIn PDF document text
    • http://re-media.ru/foto/ck/files/81551532152.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=tap+tap+apk+android+11PDF 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_off0000c955.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC955 18908 bytes
SHA-256: cb55904620234b90393c19b35b61d2655a345b2bc43c0134c6f9d3b47b30c9cc
font_01_sfnt_off0000fa7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA7D 10144 bytes
SHA-256: b03adcabb19d46068701c83fa691b08008dadbd333dfd44b434f079a4e562b11