Malicious PDF — malware analysis report

Static analysis result for SHA-256 e50e471406085fa9…

MALICIOUS

PDF

83.1 KB Created: 2021-09-15 19:30:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: f6dafc4162e32958053217e6c5f9f189 SHA-1: 715e6f33f9fc621e2b2c22564478268f38188ac3 SHA-256: e50e471406085fa9ed0fa6bc24b4f11a8ba2f8b975dadfbd991aa38e4ee1a602
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of links, many of which point to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://theofficefurniturestore.com/ckfinder/userfiles/files/59862479348.pdf In PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f3f8ea0d2f---52624253435.pdfIn PDF document text
    • https://jeanmarcrobion.fr/userfiles/file/roviwabotuna.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/hk2vqrt096g1sbipo520protjj/36706742521.pdfIn PDF document text
    • http://queensparkview.com/image/upload/File/lakodazuziwagozagidef.pdfIn PDF document text
    • https://stabiactiv.com/userfiles/file/timufosuwebosupoz.pdfIn PDF document text
    • https://aventura-agence.lu/userfiles/files/deponiliwovilolusogaxoraf.pdfIn PDF document text
    • https://dijitalsanat.link/upload/files/lopirujuba.pdfIn PDF document text
    • http://scandirent-new.ru/uploads/assets/file/xikari.pdfIn PDF document text
    • https://sysyanginguvenlik.com/uploads/files/dakeporoda.pdfIn PDF document text
    • http://esistore.be/userfiles/file/93736210635.pdfIn PDF document text
    • http://esenkardeslerinsaat.com/resimlerfiles/vedejebarig.pdfIn PDF document text
    • https://yk-tech.com.tw/ckfinder/uploads/ckfiles/files/nezujoludi.pdfIn PDF document text
    • http://prime42.ru/userfiles/files/35537881511.pdfIn PDF document text
    • http://archi-m.ru/userfiles/file/23668092018.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd8c4debcb---552747210.pdfIn PDF document text
    • http://hzqzg.com/d/files/perowuzalamekewadixevuv.pdfIn PDF document text
    • http://bearings-home.com/userfiles/file/94083159281.pdfIn PDF document text
    • https://principesgs.com/userfiles/file/pawufajawu.pdfIn PDF document text
    • http://suliaox.com/v15/Upload/file/202198831434639.pdfIn PDF document text
    • http://sportservistocik.cz/UserFiles/File/rijefakawezituxizosiju.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138ebab5779e---45632190840.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=empire+at+war+cheatsPDF 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_off0000e2f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2F3 10440 bytes
SHA-256: c4445784139bd89b80b4fc06192b6b18e5b7745ed10aeffc0dfa3e2d92d1f073
font_01_sfnt_off0000faab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAAB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000112bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112BD 17140 bytes
SHA-256: 8fb3826f24b24100dadf31cf7adb31697ac0e006f194e45c52c3d0d04c53fa26