Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4e8af42410ce133…

MALICIOUS

PDF

80.3 KB Created: 2021-09-03 03:52:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5ed7e68e9a28b56e0b759d25d1c4335b SHA-1: 8d144afb22f954823ca0ffe75996a18a5c129b9b SHA-256: a4e8af42410ce13352a2f62c72ac32137bb035004689cd7ecbaae873190aefca
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of these links and the detection results point to a malicious document, potentially delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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 http://wimborst-ceramics.nl/public/view/upload/fckeditor_images/file/82933926533.pdf In PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/e0f770c182928ef06ceb74ea301445d1/67339713397.pdfIn PDF document text
    • http://jpind.pl/userfiles/file/jevamapigitunebowusowuxo.pdfIn PDF document text
    • http://farmaciafoglia.eu/userfiles/files/39058120763.pdfIn PDF document text
    • http://bjaimama.com/data/upload/2021/07/file/202107291751524892.pdfIn PDF document text
    • http://111-orte.de/testarea/cwsCMSlight/media/files/zoloziwotaxejuv.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/f52526682d35aea4ff515602b3009d5f/94341098580.pdfIn PDF document text
    • http://www.tivafa.hu/upload/file/99061175552.pdfIn PDF document text
    • http://zulassung4you.de/bilder/file/26932508379.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e70752c583---fuxozefusabibikolo.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087da65d05e1---43295481368.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1609e476037949---75241916150.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160975df2f1b42---joduzevetib.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612354dd91fa8---wabolufibitus.pdfIn PDF document text
    • https://legend-chang.com/UserFiles/files/5664846103.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1610528ef76682---zuxedalazuwolefenudorum.pdfIn PDF document text
    • http://www.saaegfpolis.org.br/ckfinder/userfiles/files/lonuboporofewotogu.pdfIn PDF document text
    • http://samuiluxurytravel.com/Uploads/file/63584634107.pdfIn PDF document text
    • http://centralcogtc.com/uploads/file/68054716762.pdfIn PDF document text
    • https://samarpanbharat.org/trila/userfiles/file/45793714382.pdfIn PDF document text
    • http://cartopack.be/Images/file/41269911907.pdfIn PDF document text
    • http://beergolfers.com./blog/images/file/dewalovufe.pdfIn PDF document text
    • http://skylineidaho69.com/clients/c/c7/c7306e0a9cc1d421caefa9c307ca601f/File/36358006747.pdfIn PDF document text
    • http://thucancakoihikari.com/luutru/files/19195829071.pdfIn PDF document text
    • https://study-abroad-travel.com/ckfinder/userfiles/file/24908391690.pdfIn PDF document text
    • http://grossfamilyreunion.com/clients/0/00/00c8ca1d7e0432e0ca4c178cf0a97985/File/35952757941.pdfIn PDF document text
    • http://officinedesign.it/userfiles/files/79755661324.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=pruritus+ani+treatment+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_off0000d8ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f0c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C4 10592 bytes
SHA-256: 3223f7567c6f83d93da4438a7d632c9315953a0ae24622bc4c6cde32e5a84362
font_02_sfnt_off000108ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108ED 16744 bytes
SHA-256: 5825302b692fd0a519e81d260b46a38e1a1a49ace3f293cf77acdb1766daedb6

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