Malicious PDF — malware analysis report

Static analysis result for SHA-256 750d6280f8c82e8c…

MALICIOUS

PDF

70.8 KB Created: 2021-09-26 14:11:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 003ce05c380c65c5d6ddddb1aede87ec SHA-1: 4810f5f0e05f67b737c9489aa879d2a8f63974aa SHA-256: 750d6280f8c82e8c70180aaa21479ee52cc13f0dfc83f553c7b52e1f60f85ee8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded URLs, many of which point to compromised hosting or disposable domains, indicating a link farm strategy. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The primary goal appears to be redirecting users through a series of links to obscure the final destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nguyenthaotech.com/upload/files/53023464291.pdf In PDF document text
    • http://klm-co.ru/foto/ck/files/mowex.pdfIn PDF document text
    • http://health-bridge.in/upload/file/begedaga.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/f3388cef255554d7040192259384a38b/gugopotokelojobuxutatix.pdfIn PDF document text
    • https://tradegateindia.com/userfiles/file/padunibetetarumava.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/cf3fc20a0e3c13211fc555f212a73537/35270751132.pdfIn PDF document text
    • http://philboyd.com/39389288932.pdfIn PDF document text
    • https://bazk.info/public_htmluploads/file/24834098937.pdfIn PDF document text
    • https://www.baust.edu.bd/app/webroot/ckfinder/userfiles/files/86392401232.pdfIn PDF document text
    • https://chulintemple.org/CKEdit/upload/files/rozuzajesonisidenaroj.pdfIn PDF document text
    • http://alsace.annuaire-regional.com/ckfinder/userfiles/files/resox.pdfIn PDF document text
    • http://vividconcept.in/userfiles/file/minedoxasu.pdfIn PDF document text
    • https://sportsslife.net/upload/ckfinder/files/nujorid.pdfIn PDF document text
    • http://odessawa.com/userfiles/file/16101348105.pdfIn PDF document text
    • http://studiorapizza.it/userfiles/files/90404266261.pdfIn PDF document text
    • http://fatimaartwork.com/userfiles/file/xegatipewo.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161419f73bd4ee---46186060875.pdfIn PDF document text
    • https://culturasiapamplona.com/guiarte_userfiles/files/24257470112.pdfIn PDF document text
    • http://taiwangallant.com/uploads/files/202109060804498654.pdfIn PDF document text
    • http://xn--80aaa6aachkjln0qra.xn--p1ai/ckfinder/userfiles/files/xefojabevamuvar.pdfIn PDF document text
    • http://soluzionebenessere.eu/userfiles/files/24416748067.pdfIn PDF document text
    • https://prevodi-plovdiv.com/userfiles/file/62020812023.pdfIn PDF document text
    • http://stihoplet.by/upload/editor/files/44980782742.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=pope+francis+laudato+si+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_off0000b08a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB08A 17460 bytes
SHA-256: 036f4f81e3e947fda30e9380b0881e8f12b210b1a9654c1b99b61d91e5deae75
font_01_sfnt_off0000dce6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCE6 10712 bytes
SHA-256: 8c5a02d5e29c40a8180b80288c3118ef958756305e8e6aa901027ced59cee7c9
font_02_sfnt_off0000f5a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1