Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d45943c1934f97a…

MALICIOUS

PDF

82.4 KB Created: 2021-09-12 23:56:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 49d3dd224dfe5c43bced74eeefea8bb3 SHA-1: 29dd9fd86830e4f702ed536f3f18a5d81f9c2f33 SHA-256: 8d45943c1934f97a4ba0491ee8ac063ad14ce298268c5d944dd61d8a2e56f4a3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. Although no scripts were directly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://muzeumostrowiec.pl/obrazy/file/67423511117.pdf In PDF document text
    • https://ourlady-schools2.com/userfiles/files/71322794845.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613c341bb38a4---puretenupiwas.pdfIn PDF document text
    • http://studiorinaldibedin.eu/userfiles/files/40408801908.pdfIn PDF document text
    • https://newfrio.com/userfiles/files/36305104440.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161392b5c5b9c4---balitagemadax.pdfIn PDF document text
    • https://cafemocion.com/userfiles/file/dakifubuzaze.pdfIn PDF document text
    • https://mobile-translator.eu/app/webroot/media/files/pinegof.pdfIn PDF document text
    • http://danangsculpture.com/uploads/image/files/pexevuxesenibabamazow.pdfIn PDF document text
    • http://pngroup.pl/ckfinder/userfiles/files/16837308071.pdfIn PDF document text
    • https://ewastexperts.com/userfiles/files/gimoliforeseneda.pdfIn PDF document text
    • http://sinproval.it/userfiles/files/ditotopabadawaz.pdfIn PDF document text
    • http://aranysolyomfeszke.hu/editor_up/80291717204.pdfIn PDF document text
    • https://www.ijdsir.com/ckfinder/userfiles/files/50975801531.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/23711307e04401f1fa512851221a458e/52393311673.pdfIn PDF document text
    • http://phutungvespaco.com/luutru/files/48924308564.pdfIn PDF document text
    • https://optimustelecoms.com/ckfinder/userfiles/files/tifemoxumomumilukag.pdfIn PDF document text
    • http://healthywithhart.com/res/file/teworuzepojudadiwozonev.pdfIn PDF document text
    • https://poldercuptrofee.nl/site/admin/ckfinder/userfilesfiles/baborixuwuwuzedowedoz.pdfIn PDF document text
    • http://sambometal.com/dataroom/file/gakugadubutofidusigi.pdfIn PDF document text
    • https://get-insurance.in/ckfinder/userfiles/files/giritadurevugapubajilif.pdfIn PDF document text
    • https://profitaler.com/UserFiles/file/72020687752.pdfIn PDF document text
    • https://floridahouselottery.com/test/userfiles/file/lasuvifizinamakaz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=image+crop+androidPDF 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_off0000dc76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC76 10496 bytes
SHA-256: 6a899c89d185538e1ccc635fdf903cea6facb94768af38e4021ec57a21067a8d
font_01_sfnt_off0000f3f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F7 18208 bytes
SHA-256: 53c8e301d0d2f435f2ea0911f6489b403aa027c3a56cb4f04835f0097a24500c
font_02_sfnt_off0001242e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1242E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1