Malicious PDF — malware analysis report

Static analysis result for SHA-256 270786780a383fb3…

MALICIOUS

PDF

120.6 KB Created: 2021-07-14 05:08:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 25c7394015080bec7f269ccbbddd67a4 SHA-1: afb09479223e11fece607395370b212e766cf178 SHA-256: 270786780a383fb36f1f234b8f14e97297516d7c5955aeaf0462464f78fb3d64
156 Risk Score

Malware Insights

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

The file is a PDF containing a link farm, with multiple URLs pointing to compromised WordPress sites. These links likely serve as a redirection mechanism to further malicious content or phishing sites. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 6

  • 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16079ea4cf2a25---94982243773.pdf In PDF document text
    • https://schlosshotel-murten.ch/userfiles/files/vakufav.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085eb0d0a154---xiwifazuliwitapo.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160b3715364b9a---24651781754.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9e41632e23---41783908733.pdfIn PDF document text
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/b30a1bba3e2abcc2be79883a348f1c28/fejoxagujo.pdfIn PDF document text
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/krpfgb1su970tcfn6iucrpbor0/xokodujaniwumonafuk.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/1cf10f349c25775408e0ad9837589288/51000730338.pdfIn PDF document text
    • http://citra.cl/userfiles/file/roxovunixopowidedidumujod.pdfIn PDF document text
    • http://andrelandberg.com/userfiles/file/21346416861.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/upa9cdqoljeersgtvjr2j7vl60/gegosizulogavu.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160716f3198cb1---fofiregizam.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/46322898896.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cbde361c602---20119785793.pdfIn PDF document text
    • https://daismene.it/file/48232272815.pdfIn PDF document text
    • https://e-uchebnici.com/img/file/lurudarutezivufozaxima.pdfIn PDF document text
    • http://imi.vc/upload/files/wukav.pdfIn PDF document text
    • http://strandedtattoo.net/file/55058445213.pdfIn PDF document text
    • https://adikkeempat.com/contents//files/42894309023.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/1608c7d2d73c5b---6783957892.pdfIn PDF document text
    • https://jakspravnenapsa.cz/userfiles/file/wevukipiworuno.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abf8fea91a4---vexaduba.pdfIn PDF document text
    • http://diamond6ranch.com/userfiles/file/57887826619.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/k7rhgvbbrmr806civn2qgnvhe4/wadibir.pdfIn PDF document text
    • https://sbufficio.it/file/81599396087.pdfIn PDF document text
    • https://charterfori.ir/basefile/charterforiir/files/wunudovedanazuxop.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/ab58sk72c7eguscjeh2ubnrug3/burakakipuze.pdfIn PDF document text
    • https://aspaeng.com/files/image/files/26792630033.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=to+save+synonymPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000173b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x173B2 19544 bytes
SHA-256: 74049db92f4305c789ab16e2ee0505f9b2592d29ad74b747a39a5a20254b9b62
font_01_sfnt_off0001a66a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A66A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001be81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BE81 10076 bytes
SHA-256: 0e78a337cf4f6a2e156cdf1c377504ed8e7aff3e9021c6ef4d8b580951a0f2cf