Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ff7cd55f9fdcac8…

MALICIOUS

PDF

86.9 KB Created: 2021-09-05 05:37:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 798ad250ef632700bebeaebb6f64fca7 SHA-1: 0b3d1fe7a0b90aab5af94eb157f2cfedf182e313 SHA-256: 7ff7cd55f9fdcac8f3502d9336595cb2edc1b58af15f37a7816db301762e04d4
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the presence of external links and the nature of the heuristics point towards a malicious document designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://hongshengfish.com/uploadfiles/2021050808282364199.pdf In PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0b3c36fe37---sewofakaw.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/nitunibekudodipi.pdfIn PDF document text
    • http://fitviewer.biz/files/file/nebajizux.pdfIn PDF document text
    • http://omni-links.com/images/blog//file/zitijidevubewunadi.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16080929ed03a2---toriwedugowevija.pdfIn PDF document text
    • http://autohondl.cz/userfiles/file/nakokibekusuzifitesimigov.pdfIn PDF document text
    • https://amatnieks.lv/pictures/image/poradugupemigutul.pdfIn PDF document text
    • https://deycaterers.com/ckfinder/userfiles/files/78802303251.pdfIn PDF document text
    • http://mindentudor.hu/userfiles/file/20369167404.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9cd6964fc4---50188929103.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1610271629f51c---zosiferus.pdfIn PDF document text
    • https://argentinaproduct.com/ckfinder/userfiles/files/38323225361.pdfIn PDF document text
    • http://nutrizionisti.eu/public/thread/risorse/file/pawenun.pdfIn PDF document text
    • http://www.tiendadelbordado.com/ckfinder/userfiles/files/71885918327.pdfIn PDF document text
    • https://queensflower.nl/clientfiles/90139968002.pdfIn PDF document text
    • https://cantellodetersiviprofessionali.it/uploads/file/tomonefuragixorari.pdfIn PDF document text
    • http://zubrcup.by/files/files/varamufavozazozexojazavuz.pdfIn PDF document text
    • http://centronegozi.com/public/90561668008.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16083cc8a23ee7---91624168968.pdfIn PDF document text
    • http://fw-simple.com/uploads/files/92241119167.pdfIn PDF document text
    • http://tevukasveza.lt/ckfinder/userfiles/files/99928768632.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=mcse+lecture+notes+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_off0000e831.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE831 21156 bytes
SHA-256: 91b6dfea426f8045c567afa203d4892ce361fbdd047742ce60e33818d3e69a34
font_01_sfnt_off00011dea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DEA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013601.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13601 10452 bytes
SHA-256: 8c7fa262de0dd8180e8fa6580feba5f2d1548215b35d2b3988c578d3a18190ee

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