Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b8cd841352d1d08…

MALICIOUS

PDF

87.3 KB Created: 2021-08-08 21:58:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: dfbeb2291cd8e21e3b7d14d0b0c9c108 SHA-1: 8859b58614775ad2cdd315ed1d0b89e86db61c7e SHA-256: 4b8cd841352d1d0892e18838f09ea4d8709b1a4e08cec2edb97058d671725331
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised websites and disposable hosting, indicative of a link farm or phishing operation. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious content or phishing pages. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery, potentially leveraging embedded JavaScript for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://mimpishio1.com/contents//files/bezesowutuzobetep.pdf In PDF document text
    • http://tourister.kr/userfiles/file/fawitodoxiboveju.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/b67d35443f48c9a0509f4119ec5443fb/ravilorez.pdfIn PDF document text
    • https://www.cpro.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607a387f6b15b---dovegufagaferibosakazib.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/784d4fca54879d23df8884221dc56158/22668435299.pdfIn PDF document text
    • http://azizavacanze.com/userfiles/files/sebazisafavotidakamejikez.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160b4336703230---68352678857.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/553968845ce2a8a35e339168f7587192/90877044831.pdfIn PDF document text
    • http://bhhangkhong.com/upload/images/files/70961662247.pdfIn PDF document text
    • https://bomberosdenavarra.com/userfiles_nexo/files/21256748180.pdfIn PDF document text
    • https://bluetact.com/locktactyuma/userfiles/file/fagasakizekedivir.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb5ded01cd---54925327557.pdfIn PDF document text
    • http://vitanova-cattery.com/upload/file/dedatomotivap.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/temejuk.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/75597900200.pdfIn PDF document text
    • http://vasamo.org/pds/userfiles/files/78477226860.pdfIn PDF document text
    • https://oteaexpert.fr/cite_imgs/file/bagapi.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/16071927feece3---39427625284.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/vva3bt68mcb0tpt8epjq2frub7/mivusukulizuduwige.pdfIn PDF document text
    • https://masterjobintl.com/ckfinder/userfiles/files/jowuse.pdfIn PDF document text
    • http://bukharajohnscreek.com/sites/default/files/file/mamivobugekuwamir.pdfIn PDF document text
    • http://wawa757.com/uploads/files/29422015208.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d1bfe932ba3---41060277832.pdfIn PDF document text
    • http://leebyenghun.com/new/upload/board/files/japijafujutuse.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/2lc81ogq1r8keqqk5kmcd3p6b7/77736284965.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=dewalt+cordless+hammer+drill+manualPDF 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_off0000efac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFAC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000107c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107C3 10824 bytes
SHA-256: 46a0fe77362397eaa1d5a0e4fcdeaae60208986a18226ab37080c15491ce6e1c
font_02_sfnt_off0001209a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1209A 18040 bytes
SHA-256: 6dbe766cd182ce6aa2e75118ea94a1d49c0bb855c5fe90f43fbc65e636ab0c1d