Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd8f02bf7e2726ad…

MALICIOUS

PDF

83.5 KB Created: 2021-06-30 04:08:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: f81efaf2aee270c8e2593fb0e557bca4 SHA-1: f4d8ceda031b74880f93be03379258cb46007f16 SHA-256: bd8f02bf7e2726ad57adf5f75f80041e8e6824275810cc0159a3dd77ecabe60d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous external links, many pointing to compromised WordPress upload storage or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest this PDF is malicious, likely serving as a phishing lure or a distribution point for further malware. No scripts were extracted, but the presence of external URIs and the PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristic point to a malicious intent to redirect users.

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 https://drafthe.ru/uplcv?utm_term=ft+to+cy PDF link annotation
    • http://www.tomasjelinek.com/img/pub/file/wopekujetasajo.pdfIn PDF document text
    • http://silverleafspa.ca/clients/10619/File/xobefa.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/ba2285bfad6f4c869bf2661ad885d1d5/47268519181.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160ac359edd1d6---55211235165.pdfIn PDF document text
    • https://istanajpdua.com/contents//files/jewomurasobevodenelab.pdfIn PDF document text
    • http://orderkiwicafe.com/uploads/files/54135812148.pdfIn PDF document text
    • http://slphs66.com/clients/e/e6/e62fa13cff665df70d7481f632b33819/File/fanalibapete.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160c68770f0236---61334776282.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/0ead15e518313d264dae0d1978de86f5/zazup.pdfIn PDF document text
    • https://ventadeterrenosurbanos.com/userfiles/file/4681895530.pdfIn PDF document text
    • http://tutaylamhet.com/storage/ckfinder/files/89177885726.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a75493afe27---26771229133.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/f7o0utq0fs3k3adjaj722jufuu/76951401397.pdfIn PDF document text
    • https://china-glass-mosaic.com/userfiles/files/20210620_180440.pdfIn PDF document text
    • https://www.demetagras.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077dcae8853c---29269869485.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/4f00a3c0386465f3a898140a54a2d510/99673178766.pdfIn PDF document text
    • http://commsoft.nu/demo/ktb/wsmbilder/files/91930968959.pdfIn PDF document text
    • https://villadorottya.hu/uploads/frontend/files/42189796109.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/57031371786.pdfIn PDF document text
    • http://unseretochter.ch/images/file/gigoxarizokadujasaziwoji.pdfIn PDF document text
    • http://nfraccon.org/userfiles/file/xamamodaxipadotakiketafa.pdfIn PDF document text
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/2b7449bab681eb96ea2f1dde7ba0c35e/67396207413.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_off0000e4de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fcf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCF0 17848 bytes
SHA-256: 9e0d34d9274a73bbc4539848e6d4555777db6e98b16e673d442dd82b76f18a94
font_02_sfnt_off00012ba0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BA0 9508 bytes
SHA-256: 086d7842f47e8fab06d70b08977a664691da2acecf6b573c415f01f16fcb463b

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