Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bafcf9cd1b76340…

MALICIOUS

PDF

79.5 KB Created: 2021-09-19 01:54:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 555647229ee634b72ae859d2c6e957d0 SHA-1: 0a998cb2e2edaab61c64694f3205227332d156d3 SHA-256: 9bafcf9cd1b763402422bb4e674b132e3565535298bd266f4142ac8034c87d8b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or are part of link farms designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://wastran.ru/uplcv?utm_term=download+wps+pdf+apk PDF link annotation
    • http://alajwakh.com/uploaded_files/userfiles/files/sunefajiserijuvi.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/161454668737b7---52137208309.pdfIn PDF document text
    • https://tlkingatlan.hu/kepek/other/file/mukijekamunuxedawubofugi.pdfIn PDF document text
    • http://grandfiltr.com/files/file/rilodarumapanozawifopej.pdfIn PDF document text
    • http://ahnil.com/userData/board/file/34004957609.pdfIn PDF document text
    • http://yjccnc.com/upload/files/zeketetipu.pdfIn PDF document text
    • http://patriabrno.cz/userfiles/files/tilonujuduwevikuxo.pdfIn PDF document text
    • http://wildzipper.com/clients/wildzipper/userfiles/file/6487962449.pdfIn PDF document text
    • http://dush-kz.ru/uploads/fck/file/jogotazetisunaronajuzizul.pdfIn PDF document text
    • http://thenext.pk/userfiles/files/8903245527.pdfIn PDF document text
    • https://bongkartuantakur.com/contents/files/36100138197.pdfIn PDF document text
    • http://skulpt.in/admin/uploads/file/34606103803.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/73851847371.pdfIn PDF document text
    • http://01host.ru/userfiles/files/fajowivekobomizu.pdfIn PDF document text
    • https://healthlantern.com/ckeditor/ckfinder/userfiles/files/sugepatefad.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/ge19kt4cvfadimjq41031ebb26/gimilebagujilera.pdfIn PDF document text
    • http://attlas.center/userfiles/file/96597689497.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613dd7525d4f9---42725067212.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d8bb773ff7---wiziden.pdfIn PDF document text
    • https://gites-les-bardots.com/userfiles/file/89040293941.pdfIn PDF document text
    • http://dekobonner.de/userfiles/file/jeledekovedemupivavo.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131a97fd7637---65040034862.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/ubjc6scgukkp7vvhk26b7807hs/savibuvajojomig.pdfIn PDF document text
    • 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_off0000d41a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD41A 10248 bytes
SHA-256: 3adb7946a7eace203f426e504d0c3953c2c43271d6e7784cc12b880e8b48725e
font_01_sfnt_off0000eb46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB46 17632 bytes
SHA-256: 1ecf76c1209a410b36917a942c077ec7928fa29fad0f7f53c0c74f61c8983c76
font_02_sfnt_off000118ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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