Malicious PDF — malware analysis report

Static analysis result for SHA-256 89d35d3a874e9a23…

MALICIOUS

PDF

92.3 KB Created: 2021-09-03 10:11:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 809ace3935028ad1eb4930a65218491f SHA-1: 7f44a01c8405689f5e055e095cb5c446674d17df SHA-256: 89d35d3a874e9a23951ebe5bdc1b31dd44852d5955d17a08e5fc40fe17c46d25
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it is designed to facilitate malicious redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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://karpataljaturizmus.hu/upload/8825387046.pdf In PDF document text
    • https://brazilairporttransfers.com/ckfinder/userfiles/files/jorodijeturisebuwomuteje.pdfIn PDF document text
    • http://helpibr.org/clients/f/fe/feaff840d005acecac0f151e8679c8db/File/dunebiminuwek.pdfIn PDF document text
    • http://ylgems.com/file_media/file_image/file/gunamusupatimipelo.pdfIn PDF document text
    • https://www.tvmreza.tv/ckfinder/userfiles/files/58899927691.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/1fb1ab0819e136a066fe9b3c51e7a741/piwomabiz.pdfIn PDF document text
    • https://triptoboloyfoundation.org/editorsfiles/files/85336713270.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/6h1j652rdkimgfbsc3q6csq372/pezegoxupafekumonil.pdfIn PDF document text
    • http://alvit-bk.ru/userfiles/file/mujebanewemavebovonawunuk.pdfIn PDF document text
    • https://pharma-tools.eu/galeria/file/82811565547.pdfIn PDF document text
    • http://xn--vb0b83rba554gca.kr/page_data/file/20210516093750.pdfIn PDF document text
    • http://jhdljz.com/userfiles/file/1626197336.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b73fce6ca1c---53485361618.pdfIn PDF document text
    • https://cahayaapi1.com/contents/files/33715868661.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/laipadnrbhnkue0l8333p8caoa/pizaxiwuvarajup.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/8a5pvh65fi6tn7pju9mtjc23or/rovixudebozoxip.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/160872a77510bd---ponudov.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/e5a9e70491cdb7b1880bf489bc0e7967/rimutuwifewupotikibazosan.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/aavt9r91hblpl01ch0lmk2qv5i/92765374746.pdfIn PDF document text
    • http://nsmpublicschool.org/slbdavbatala/userfiles/file/bavur.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a69f6a73527---xomaduru.pdfIn PDF document text
    • http://dydlhx.com/upfiles/file///vavimiwosuvatu.pdfIn PDF document text
    • http://seritour.com/rsm/files/36981841421.pdfIn PDF document text
    • http://wellgroup.cz/UserFiles/File/12917295546.pdfIn PDF document text
    • http://fotografiafrancescosomma.com/userfiles/files/61038911696.pdfIn PDF document text
    • https://hyundaia.ru/userfiles/file/4191462728.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=pdf+pancasila+sebagai+etika+politik+indonesiaPDF 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_off00010433.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10433 10928 bytes
SHA-256: 2fc37cab6f30ded6587b0b9bd266f0bb5b1756f31f531635c9eb3194f6318117
font_01_sfnt_off00011d3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D3C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001354e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1354E 17720 bytes
SHA-256: d7657b52a39552c6cc00e2e07195459787babdedaefad4787148bd213eb27bd9