Malicious PDF — malware analysis report

Static analysis result for SHA-256 5adb87ba93a4b2b1…

MALICIOUS

PDF

87.3 KB Created: 2021-07-08 09:26:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: c5e80497af446512a9e3a17e0b1f4d55 SHA-1: 3d1d674ba1e5463f9a98d03b0a975a044e3ac3bc SHA-256: 5adb87ba93a4b2b1aad7bcc12665051340278dffc54cdde97310a47a51c84e93
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 0.4349

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://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16081a06572a06---zoxewojebawaxatofofaj.pdf In PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/286ef5156d4d34990b5638c4ff9b9e1c/4798761753.pdfIn PDF document text
    • http://bostonmentors.com/userfiles/file/66141652988.pdfIn PDF document text
    • http://gerocuki.hu/user/file/62902083535.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/54863184677.pdfIn PDF document text
    • http://kompletucetnictvi.cz/files/file/xukobivotugavuzep.pdfIn PDF document text
    • http://nano-vip.com/ckfinder/userfiles/files/67805878169.pdfIn PDF document text
    • https://chpcentre.com/files/file/42072599739.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5887c94c1---kasazikekaxekuzinenipejas.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/b29285eeec5b66484e4afa15dea78175/gomumelojinuvarave.pdfIn PDF document text
    • https://ankaratemizlikcim.com/depo/sayfaresim/file/77045775847.pdfIn PDF document text
    • https://chrmglobal.com/userfiles/file/ritugepazamesawo.pdfIn PDF document text
    • https://metricgroup.it/uploads/file/3945392996.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/3foir0ff26guqnipaggsgd8af5/53115223480.pdfIn PDF document text
    • https://fanaf.com/article_ressources/file/titebe.pdfIn PDF document text
    • http://abwingscolley.com/uploads/files/puzerozodosaruwesifux.pdfIn PDF document text
    • http://healthywithhart.com/res/file/zabaguzowifefozerarile.pdfIn PDF document text
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607b9f2b774a2---21850402669.pdfIn PDF document text
    • https://grand-forge.ru/wp-content/plugins/super-forms/uploads/php/files/c9b6c110e3f882f1608f73f0da452c94/napusumomiluputiri.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1608143aadf2d1---43839615829.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=clash+royale+win+ratePDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a1f7c39014---82427562784.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e89b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE89B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000100ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100AC 16604 bytes
SHA-256: bbdf48d6ae4342e998f75340cf8c25bb35bd2606f21a51b2555f50bcff5aa125
font_02_sfnt_off00011812.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11812 10436 bytes
SHA-256: f8cf12312684e14c342b6f6876824039ef3360991d90f796edd08d863020d30e
font_03_sfnt_off00012fbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FBF 2688 bytes
SHA-256: 9a130951a291cd9bb0a397a879fce5fc13faa3b3cc1a31c8f2c143422cdccccc