Malicious PDF — malware analysis report

Static analysis result for SHA-256 d35362a7128fd636…

MALICIOUS

PDF

85.4 KB Created: 2021-08-26 11:10:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ba3bf14746b64f2ba4401ce650f67d2d SHA-1: b58ae63c203d47401faf37ae7a3cfe558557d838 SHA-256: d35362a7128fd636397beeb903e513bf7c89ef630d275e0e3783f4c247748006
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The document contains a link farm pointing to various domains, many of which are hosted on compromised CMS uploads or disposable hosting, suggesting an attempt to distribute malicious content or phish users. While no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/evo2ruuq97o298mdrets34sa86/54273929287.pdf In PDF document text
    • https://larustt.com/upload/ckfinder/files/92411504606.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/0179ffd3cf55a69bb021986e4c21efef/zulopeguvake.pdfIn PDF document text
    • http://jinshi66.com/uploadfiles/files/diropipimoni.pdfIn PDF document text
    • https://serwisnawigacji.pl/userfiles/file/99131154945.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d557f36e3c---vulazanasagu.pdfIn PDF document text
    • https://mudraconsultancy.com/uploads/files/20328670017.pdfIn PDF document text
    • http://mariondhuique-mayer.com/data/file/foloxisitigi.pdfIn PDF document text
    • https://www.zolmedis.lt/ckfinder/userfiles/files/romegasekenitazuviwovor.pdfIn PDF document text
    • http://biosite.ru/images/news/file/dopoxofuzirevutijavu.pdfIn PDF document text
    • http://mvhs1964.com/clients/2/20/2030ff4f331b14c2016b95997514b7ac/File/sozezelurul.pdfIn PDF document text
    • https://nabsangram.com/userfiles/file/xazajijinisi.pdfIn PDF document text
    • http://irs-messtechnik.at/upload/76910351965.pdfIn PDF document text
    • http://acpiindia.com/userfiles/file/83113477476.pdfIn PDF document text
    • https://capecoralliving.com/media/file/minefezofox.pdfIn PDF document text
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/1608c1af487612---859264486.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/160a8a1bfacad3---90268640227.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c4f2d0adfa2---vajok.pdfIn PDF document text
    • http://mamitobe.ru/files/file/lelirufupuxijavapevomu.pdfIn PDF document text
    • https://riolospettacoli.it/filesUploads/file/dotezebojaxibenutir.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/11893073932.pdfIn PDF document text
    • http://locum-system.pl/userfiles/file/tetutarotasoje.pdfIn PDF document text
    • https://digireg.pl/upload/xopifilin.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16092f03ce1369---pukolobozorowovowexotosu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=functions+of+a+leader+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_off0000ed8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED8C 10688 bytes
SHA-256: b903ae11648604ae370acc93b0a2b91571708a9d4318f99356cfcab3f74f767a
font_01_sfnt_off0001062b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1062B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E3D 16192 bytes
SHA-256: 64b75ae22526e8e19ebddf422334f519ec8a396b64948b615a11111f7d01bb47

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