Malicious PDF — malware analysis report

Static analysis result for SHA-256 db8a4f7441dca145…

MALICIOUS

PDF

81.1 KB Created: 2021-09-06 10:49:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: b7cf353d4a51e0195248aa1fff68f6b5 SHA-1: c3c425a6ef2dd8ec024159e7cbdcbab571652430 SHA-256: db8a4f7441dca145f469b5da3395e7ec2427504dfeb54ecf62dd3195f7785b05
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to lure users to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://philabc.ru/uplcv?utm_term=quartetto+d%27archi+spartiti+pdf PDF link annotation
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/fufiwisebu.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4d10bd073---jazipogokigotodumibanulo.pdfIn PDF document text
    • http://fsoa.cn/userfiles/file/zomipavufuwij.pdfIn PDF document text
    • https://wisestudentz.com/userfiles/file/31260779279.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607f8c26c6a62---63373577106.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/7f609d1ee7e3c9dfcd92570ea8a2b176/71009742703.pdfIn PDF document text
    • http://gruaszarate.com/ckfinder/userfiles/files/jejexujajenagovogu.pdfIn PDF document text
    • http://157.230.241.115/image/upload/File/jixetasefuvad.pdfPDF link annotation
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/16123599e0e951---73970504052.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160bec0fbc2a50---vilosimikebogujejeni.pdfIn PDF document text
    • http://baobiachau.com/luutru/files/tanujuzixabovapit.pdfIn PDF document text
    • http://m2mus.pro/clients/b/b1/b1ca46fdb12d68e762e4a8b3318caec0/File/95015350519.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/16123ac57b44f4---redofoborixotubi.pdfIn PDF document text
    • http://dtmaso.com/public_html/Imagens/file/24762910892.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad5ab20bc1d---pomifaj.pdfIn PDF document text
    • https://jakspravnenapsa.cz/userfiles/file/bigorupatojeret.pdfIn PDF document text
    • https://biorenta.lt/ckfinder/userfiles/files/46146564581.pdfIn PDF document text
    • http://winkeleninzundert.nl/uploadimages/files/76795536928.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607b047264a57---zudojufewexonedo.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f5cf333f9a0---rolajajanox.pdfIn PDF document text
    • https://aedwea.com/upload/foto/72925615618.pdfIn PDF document text
    • http://tranhdaquydep.vn/upload/files/sereranefalejegutivitopiz.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160b3a6b0447b0---42968289883.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/160b6ae24bdfd2---92528179314.pdfIn PDF document text
    • 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_off0000d749.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD749 17644 bytes
SHA-256: e6c8a9eb3f25f41c3a49e89df4d071ceba945b192c9f7e29a2475af41652be3c
font_01_sfnt_off00010552.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10552 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D69 10760 bytes
SHA-256: d203d75c964f4c97bfc2584840d989755af6d8cd6e32e405de620fc7f4ec583f

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