Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ab105e96b347e3f…

MALICIOUS

PDF

78.7 KB Created: 2021-10-13 03:16:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: aee7a9a18373d38357e4223383324b11 SHA-1: 7085278ae5ec6f0b29adf93d19fb1193ff29aba9 SHA-256: 4ab105e96b347e3fab319a1ab824bad83849fa5d7f340a060797b5b4a93b8d68
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and link farm heuristics indicates an attempt to lure users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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.immo-uno.com/ckfinder/userfiles/files/51681001622.pdf In PDF document text
    • http://thaisomboonautopart.com/userfiles/files/29064297272.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1614f02b66f1a9---milijena.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/4056d271a052e5d4615e9089bf93adb5/49975461554.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/948e16f7deb7895f641047807c187fab/77110239186.pdfIn PDF document text
    • http://greenearthgardens.org/userfiles/sululukikeminogevixoneku.pdfIn PDF document text
    • https://datajournonepal.org/files/nubufazi.pdfIn PDF document text
    • http://sriraghavendratemple.com/ckfinder/userfiles/files/74093459017.pdfIn PDF document text
    • http://yansyuan.com/UserFiles/images/files/68489550995.pdfIn PDF document text
    • http://chieusangducphat.com/uploads/userfiles/file/45629380941.pdfIn PDF document text
    • http://cbstav.cz/file/gijogasoxani.pdfIn PDF document text
    • http://aan.kz/ckfinder/userfiles/files/5784065934.pdfIn PDF document text
    • https://goez1.com/10005001208290177/ckfinder/userfiles/files/94402775178.pdfIn PDF document text
    • https://ww150002.linebot.net/upfile/files/20211007235248.pdfIn PDF document text
    • https://tolgyesvolgy.hu/userfiles/file/18929185117.pdfIn PDF document text
    • https://www.aukuras.org/ckfinder/userfiles/files/93987175849.pdfIn PDF document text
    • http://air-con.ru/upload/files/36892861115.pdfIn PDF document text
    • https://radio-aurea.eu/files/file/64858146523.pdfIn PDF document text
    • http://kayapalinakliyat.com/file/rivanatoxuro.pdfIn PDF document text
    • http://medicamarsala.it/userfiles/files/44153107230.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f9b2eb69b3---18058071906.pdfIn PDF document text
    • https://polresseluma.com/assets/ckfinder/core/connector/php/uploads/files/1034070086.pdfIn PDF document text
    • http://beverly.kopanramen.com/uploads/files/62039252992.pdfIn PDF document text
    • http://miryangpension.com/FileData/ckfinder/files/20211004_43AA8E25DC60C7D7.pdfIn PDF document text
    • http://www.mbk-montage.nl/ckfinder/userfiles/files/1698227928.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/2I9n2o-U8HI/uplcv?utm_term=best+book+on+real+analysisPDF 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_off0000cb6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB6A 18400 bytes
SHA-256: 0f29cc1975b3ffd076de37dff8677e6f507e0607fb558035be543103790271b3
font_01_sfnt_off0000fb1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB1A 10500 bytes
SHA-256: 2c9dc3a6cbf8d7c120fcd000240b4c6fb1497886c21e7d87d51ea9f8f4e96fb2
font_02_sfnt_off00011332.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11332 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1