Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f908f63c223612c…

MALICIOUS

PDF

65.1 KB Created: 2021-10-09 03:06:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 9148bed1d3003a3fce08e3ff23fd4a5a SHA-1: 7278d79bd8a5bc1731ddd0394220f7be6118d163 SHA-256: 4f908f63c223612ccd37e60dff91150217162264518e3f0424a2f910cdedce31
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS uploads, indicating a link farm designed to redirect users. ClamAV detected this file as 'Pdf.Phishing.Trojan', and ML classifiers also flagged it as malicious. The primary function appears to be directing users to potentially malicious or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5479

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 http://dr-onesrl.com/userfiles/files/25536048187.pdf In PDF document text
    • http://centonze-vini.com/userfiles/files/nadifevupudebovira.pdfIn PDF document text
    • http://katyababash.com/images/uploads/file/zuxiketexulixebi.pdfIn PDF document text
    • https://postelezmasivu-ostrava.cz/ckfinder/userfiles/files/butekos.pdfIn PDF document text
    • https://tarzminder.com/resimler/files/robexizofemafobaruram.pdfIn PDF document text
    • http://zvaracskaskola.eu/editor_uploads/system/files/senusimijarerenawek.pdfIn PDF document text
    • http://obasekiestates.com/UserFiles/file/93607537502.pdfIn PDF document text
    • http://quangcaosms.org/media/ftp/file/feserisufadakowupo.pdfIn PDF document text
    • http://arucax.am/user_images/file/48458055870.pdfIn PDF document text
    • https://ispartaprefabrik.com/ckfinder/upload/files/89599266333.pdfIn PDF document text
    • http://loaamtran.vn/files/usersfiles/files/85060921694.pdfIn PDF document text
    • http://tokstar.com/_UploadFile/Images/file/77192655531.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/uee8mto0vsebpuvh5qo20eeo74/4616770732.pdfIn PDF document text
    • http://ntep2008.com/UserFiles/File/sijubekajiremogotusa.pdfIn PDF document text
    • http://sirinthepgroup.com/userfiles/file/momevuroduboliligagakato.pdfIn PDF document text
    • http://nemdanangpho.com/uploads/2021-09-21/images/files/kijar.pdfIn PDF document text
    • http://ciccioinpentola.com/userfiles/files/zofoxerobek.pdfIn PDF document text
    • http://archinfo.ru/uploads/file/75478872132.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613d184d34097---zetupetikikezitubebijug.pdfIn PDF document text
    • http://sluchatka-shop.cz/files/upload/files/52770998331.pdfIn PDF document text
    • http://bbmpva.nl/fckassets/file/138944395.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/mjrnd39agi3j01dgn2dtmqe97b/ruzapedepavanisedo.pdfIn PDF document text
    • http://seghers.kr/data/editor/file/679261172614c5850b9083.pdfIn PDF document text
    • https://askisan.com/upload/ckfinder/files/zipanuwekilixanedize.pdfIn PDF document text
    • https://valerart.com/ckfinder/userfiles/files/tisizu.pdfIn PDF document text
    • http://dragonspond.com/uploads/files/55008753484.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=three+seconds+basketballPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d44c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD44C 17100 bytes
SHA-256: 380cbcf3523cd190c7401a9eeb03aad67990f9e64bc350c646c6ed021c5c2275

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