Malicious PDF — malware analysis report

Static analysis result for SHA-256 771d4fe28844bb49…

MALICIOUS

PDF

86.4 KB Created: 2021-08-20 21:51:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6ac3e6ae6b2d03542d3b4c655196e833 SHA-1: 758c1f38e5af51ad6ac9f2ad64b0fe5c6395dc0f SHA-256: 771d4fe28844bb492c1fdd905ba50f0f0fcc0aa16257c08d2d5596857d39b8fa
156 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 or disposable hosting domains, indicating a link farm designed to redirect users. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest malicious intent, likely for phishing or distributing further malware. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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 http://suamayin.biz/userfiles/file/71259665479.pdf In PDF document text
    • http://aldo-ins.com/userfiles/file/minime.pdfIn PDF document text
    • http://hzjksj.com/images/upload/File/45824539051.pdfIn PDF document text
    • http://beiks.info/public/file/60352131193.pdfIn PDF document text
    • https://capitaleny.com/wp-content/plugins/super-forms/uploads/php/files/304088edb55a75433af8267afdef646b/29013153103.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/c5d081d7e230c0a0c22dafe8275de201/30813641287.pdfIn PDF document text
    • https://aiwatopup.com/ckfinder/userfiles/files/sisanubevefumikikiw.pdfIn PDF document text
    • http://hodinovysoused.cz/upload/file/donexekonekariga.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba9538c6101---14025222386.pdfIn PDF document text
    • http://www.ciesol.es/ckfinder/userfiles/files/paguwigabanenegajovozexas.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c30fc7aa248---zobuvarebutawejos.pdfIn PDF document text
    • http://benetalent.com/upload/files/zigusapatotoda.pdfIn PDF document text
    • http://aklond.com/UploadFilesfile///2021050411113286.pdfIn PDF document text
    • http://mofrantech.com/userfiles/file/midumovepakuluput.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/93b061932a1d394c05c5d9b6d7f6682e/8238707217.pdfIn PDF document text
    • http://smartraoptics.com/fck_filemanager_upload/file/12863223325.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607ae6a8d110e---bubogexujukega.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1f26fa7964---nedupaduzixiwesapegomigit.pdfIn PDF document text
    • http://ifa-astrologie.de/userfiles/file/dokezifipareve.pdfIn PDF document text
    • https://orig-shop-gsm.ro/ckfinder/userfiles/files/fonusaxajetugid.pdfIn PDF document text
    • http://divapharma.com/uploaded/file/wakusofazediwar.pdfIn PDF document text
    • https://stomatoloska-ordinacija-rijeka.com/files/vibozutonekidexoxuwotowi.pdfIn PDF document text
    • http://pc-driver.ru/userfiles/files/pigodafujux.pdfIn PDF document text
    • http://goldstecq.com/userfiles/file/89137971570.pdfIn PDF document text
    • https://nstyapi.com/resimler/files/nisobo.pdfIn PDF document text
    • http://tv-sat.cz/userfiles/file/wijeso.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+apply+for+federal+skilled+worker+program+canadaPDF 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_off0000e6a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6A2 11244 bytes
SHA-256: f7d4c22450bf3cd19038fb215d7ec5cbb964679ecf81de2097e8dec9c56149c2
font_01_sfnt_off000100d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100D3 19432 bytes
SHA-256: f4b081a9df32152a3a1dec56f5c42f30def50694c2f6047dcf0abf759f345456
font_02_sfnt_off000132dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1