Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9e4d17717c5bd88…

MALICIOUS

PDF

94.8 KB Created: 2021-09-08 09:52:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8ff42d0bf346dc48882254a339c8d0f4 SHA-1: 356423b587ec747d026b0ba24c92947357e0ffdd SHA-256: f9e4d17717c5bd88240b73bc8e9426023dab6b803e9324abf93653842792e856
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised websites, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the nature of the link farm and the PDF structure implies an attempt to redirect users to malicious content, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4c6e065884---45693800890.pdf In PDF document text
    • http://cnc-soustruzeni.cz/files/file/72518739384.pdfIn PDF document text
    • https://photofetimages.com/xogoderikowijifasulexoz.pdfIn PDF document text
    • https://steklo-shik.ru/userfiles/file/deguvapinirasuv.pdfIn PDF document text
    • https://iphonerepairservice.nl/app/webroot/files/userfiles/files/4863103856.pdfIn PDF document text
    • http://doks-films.com/pcms/content/file/709278702.pdfIn PDF document text
    • https://dorfadvertising.com/ckfinder/userfiles/files/64366785301.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1612e98520433f---16200954051.pdfIn PDF document text
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/2017e942c1bab44c434282222ccf9102/11038207885.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba105b56614---13355358644.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/7efed86fd92715571a0cd8d8d57071e8/8924073133.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160850e4a5bed5---gogaxiloviwezubar.pdfIn PDF document text
    • http://tctrack.vn/images/newtech/files/94094583862.pdfIn PDF document text
    • http://www.electricman.in/demo/frontend/web/uploads/files/48657853145.pdfIn PDF document text
    • http://e-pisanie-prac.pl/famprojekt_z_serwera/images/file/tegosuboj.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609831d5ea021---40663594097.pdfIn PDF document text
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/b123f6f729b7eeb8102263511c5141cd/49241095888.pdfIn PDF document text
    • http://karpatskiles.ru/store/files/sefubufilozogevetenuzore.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/30844965a79c75795901a3021c89f70e/nokozukilipelanafezajexe.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/94bef3fac57860e053fe840341c47ee6/kamavidafalim.pdfIn PDF document text
    • http://utuin.net/files/fckeditor/file/9383823080.pdfIn PDF document text
    • http://naszymsladem.pl/upload/file/sodajurofuzemak.pdfIn PDF document text
    • http://chapelguild.com/images/usr/lupeg.pdfIn PDF document text
    • http://podlahypilat.cz/admin/file/tizetokofefunuguzadufut.pdfIn PDF document text
    • http://elm3rad.com/file/pizutunogojugopafenaso.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=classical+theory+of+criminology+pdfPDF 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_off000108b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108B9 18892 bytes
SHA-256: b0a801f6e2b1afd8a0c7136bcfeb03f3c6d12c8b588c81a53606d9529983795d
font_01_sfnt_off000139ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000151e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x151E5 11212 bytes
SHA-256: f92aeee30ae4e005933d3ffdb426e47150504b04d4ca3d6c08907e1672d7e3f7