Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffa4af71982ca4e3…

MALICIOUS

PDF

76.2 KB Created: 2021-09-23 18:26:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a478388cf485e929b98bf6330a5e9143 SHA-1: 79e8d092f7874fe0ec2bd8ac60fd329f5c931f23 SHA-256: ffa4af71982ca4e3a19e94544608cc677241644bd3a6f4830a9c4468b75408b5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised or disposable hosting, suggesting a link farm designed to redirect users. While no scripts were explicitly extracted, the nature of the URLs and the 'link farm' heuristic indicate a phishing or redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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
  • 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://www.civilhospitalpalampur.in/img/uploads/files/nejogunufigudavef.pdf In PDF document text
    • http://energo-market.ru/sadm_files/12290269182.pdfIn PDF document text
    • http://dissanna.com/temp/fckeditor/file/49744241141.pdfIn PDF document text
    • http://antonellascarpittadesigner.it/userfiles/files/54984865385.pdfIn PDF document text
    • http://xn----otbb6ahq3d.xn--p1ai/ckfinder/userfiles/files/69847521775.pdfIn PDF document text
    • http://medwin.kr/userData/board/file/betexukorekoba.pdfIn PDF document text
    • http://alwaditrading.com/userfiles/files/56502148505.pdfIn PDF document text
    • http://vino-charlie.cz/userfiles/file/jokoteg.pdfIn PDF document text
    • http://xsjsbzrw.com/uploads/files/90813045947.pdfIn PDF document text
    • http://dep14kirov.ru/userfiles/file/49171043215.pdfIn PDF document text
    • http://residencecarlofelice.com/userfiles/files/99586345243.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-9-3/20210903152947228908.pdfIn PDF document text
    • http://pattarasawat.com/ckfinder/userfiles/files/wunofosupa.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614be7c067933---besuradox.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b162c163bb.pdfIn PDF document text
    • http://ebrinteractive.com/userfiles/file/25025625405.pdfIn PDF document text
    • https://creteotels.gr/FCKeditor/userimages/file/tovifi.pdfIn PDF document text
    • http://fuzoku-kyujin.jp/ckfinder/userfiles/files/pimatiju.pdfIn PDF document text
    • http://smcertificationservices.com/userfiles/files/pululomodaponuwawu.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/7d73932b20386e3c76c7a307395781ff/lepemobukutixizova.pdfIn PDF document text
    • http://ryouhurt.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/23228019144.pdfIn PDF document text
    • http://redeyeldn.com/userfiles/file/61117376327.pdfIn PDF document text
    • http://glovimex.com/uploads/ckfinder/files/pogajoduduxifulesoloraf.pdfIn PDF document text
    • http://foodzipo.com/uploads/userfiles/files/14909475265.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=sports+channels+apkPDF 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_off0000c64c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC64C 10544 bytes
SHA-256: 17bf8ab105352a29dc2229fd2b5b0cde7c28ff93c08e76de71141fb635a6c43f
font_01_sfnt_off0000de42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE42 17304 bytes
SHA-256: fcaacb81d8e50beafe841d5f2cfd7bcd36ef439b0600865aef6677ce895cfdcc
font_02_sfnt_off00010b34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B34 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1