Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1d55f9ecee71dbd…

MALICIOUS

PDF

72.1 KB Created: 2021-09-05 05:23:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 3980c06a58283a757406e6f8e6917648 SHA-1: 06ef20cbdae1d3f3436800117cc3578dcc4b3beb SHA-256: e1d55f9ecee71dbdc1f26721c388109c494ee65142aeb995267d9edf2a34d5a7
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4393

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 https://ntwbearing.com/UserFiles/File/lajitalil.pdf In PDF document text
    • http://krupongs.com//images/file/53712945725.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/26c3ac99244ebb94bdf661644a603614/pelovazuzojeduja.pdfIn PDF document text
    • http://www.vljainandco.com/userfiles/files/40047012644.pdfIn PDF document text
    • http://skene.es/userfiles/file/ralebediwegozofodusu.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161039fa5547d7---fudijadabanexafubixuf.pdfIn PDF document text
    • http://jungam21.com/upfiles/file/1629937602.pdfIn PDF document text
    • http://xaydunglenguyen.vn/upload/files/f91e24.pdfIn PDF document text
    • http://cn-biyoute.com/d/files/13371661287.pdfIn PDF document text
    • https://www.adoz.cz/ckfinder/userfiles/files/67519379087.pdfIn PDF document text
    • http://espacioschillout.es/images/admin/file/86215694851.pdfIn PDF document text
    • https://theelementrama9.com/userfiles/files/71574114412.pdfIn PDF document text
    • http://deeringbayrealestate.com/userfiles/files/63287084072.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/2023d6e700048f901d98ee965df2ea55/jamazebijun.pdfIn PDF document text
    • http://allaboutdowney.com/userimages/pulajevojugasogun.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b505155555---19389815159.pdfIn PDF document text
    • https://mimpishio1.com/contents//files/jawogibewujorinew.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bd7fa60796---12169258531.pdfIn PDF document text
    • http://jinistudy.com/_UploadFile/Images/file/65758136239.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/vjrbbe9m388qglnrdkc353lgkc/litoger.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f622fab3dc---gefafajutuboreluw.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/45669562933.pdfIn PDF document text
    • https://hyosungulf.com/uploads/file/bupitexaxulijuzim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=savage+sam+book+pdfPDF 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_off0000e373.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE373 10772 bytes
SHA-256: a12dee36a39ef053deff8033217768374614bf0fb11d2ee0c3c1ac56691e6fb8
font_01_sfnt_off0000fbdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBDF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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