Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cfde641056021d0…

MALICIOUS

PDF

93.5 KB Created: 2021-08-18 06:15:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-03
MD5: d0164a5a3a479d3678e55b8d6b25bd05 SHA-1: 9595e8fc7ffde818b2bb6b713f48460bfb696d71 SHA-256: 7cfde641056021d08c7a2e8c6f3246eff8cbad07fc924db0421db750765cad34
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file exhibits characteristics of a phishing or malware distribution campaign. It contains numerous links pointing to compromised websites and disposable hosting, suggesting an attempt to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely involving the exploitation of PDF vulnerabilities or the delivery of a secondary payload via embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 https://medvor.ru/uplcv?utm_term=maytag+bravos+xl+dryer+stopped+working PDF link annotation
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/90295543c79a03b6aaee7b24cd77e131/36578761677.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/16089ed2169c3c---sozujufuzebopaluzobit.pdfIn PDF document text
    • http://poorclarescork.ie/images/75002199960.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/hm0vk2cm0kqhn8acti98ar3tt8/69120101369.pdfIn PDF document text
    • http://phdpecs.hu/userfiles/files/jaximesuzep.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/e027265446534ebee465e0699f8f12d0/51644816495.pdfIn PDF document text
    • http://networkinglikepro.com/ckfinder/userfiles/files/gojukodezovinudov.pdfIn PDF document text
    • http://rayanchem.com/d/files/bakipuvi.pdfIn PDF document text
    • http://gtlmarinefuel.com/userfiles/file/rijibosatijonakedefovul.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/71e50bd8a1eb5e3afa0f6501dbda9628/32394326580.pdfIn PDF document text
    • http://mstreatmentadvances.com/userfiles/files/wupudera.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16112f2704fcc4---69158508657.pdfIn PDF document text
    • http://www.chatanakonci.cz/userfiles/file/gomezofafokavovato.pdfIn PDF document text
    • https://alshaabcoop.com/userfiles/file/71659457259.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/3sgo889qq60km60kvoonusmpc8/34879789383.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c770b169893---54662816678.pdfIn PDF document text
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/160775c0f9dda1---27706408368.pdfIn PDF document text
    • http://nsk-nalogov.net/upload/files/76352386418.pdfIn PDF document text
    • http://amon-syotengai.com/userfiles/file/guvovi.pdfIn PDF document text
    • http://circuitoinsulargc.com/documentos/file/kejupumanepew.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/755unjo774c7423l74914algp9/tatuz.pdfIn PDF document text
    • http://rockhousemethod.com/ckfinder/userfiles/files/tirematenedobilinete.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606eec5de3641---tefate.pdfIn PDF document text
    • https://bwawarszawa.pl/upload/file/85909629656.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_off00010484.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10484 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011c9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C9B 11160 bytes
SHA-256: ba123b3e6879762d24b0cd8e2b0968b1d44bc087672e5cb6037b2555cb59b75c
font_02_sfnt_off00013679.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13679 18712 bytes
SHA-256: 6bab8afee199046f6196b0ee41db9899b237e24a85d8b07622ffa611c13b276f

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