Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4525b5152c5f1b7…

MALICIOUS

PDF

79.9 KB Created: 2021-09-18 05:37:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: bce6fb025d97baf049f03071407b7dd1 SHA-1: b8a4fe463a70cc078ca4e8e3bd3cdee5bfa309cc SHA-256: b4525b5152c5f1b7037d8428ff88a6c760c35cd400ca9baaa15c3176c370853b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. The heuristics reveal it functions as a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting, likely to obscure the final destination. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest an attempt to redirect users to malicious content, potentially through embedded JavaScript.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9938

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://sudeoksa.org/userfiles/file/20210913121046.pdf In PDF document text
    • https://gsacademy.ge/uploads/files/mikalane.pdfIn PDF document text
    • http://tetraeng.it/userfiles/files/85617493760.pdfIn PDF document text
    • https://stepweystudy.com/ckfinder/userfiles/files/38775761932.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/b1054603222b543891fefbbb06c3faf4/nesejolevutazapekit.pdfIn PDF document text
    • https://curvy.tw/upload/files/35457976357.pdfIn PDF document text
    • https://www.truck-transport.com/ckfinder/userfiles/files/964631564.pdfIn PDF document text
    • https://curvy.tw/upload/files/lixegelezewubobuxitax.pdfIn PDF document text
    • http://thaicockstar.com/ckfinder/userfiles/files/37566038178.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/t29i704iioj128odlnmamj1el6/30156569644.pdfIn PDF document text
    • http://kutyasturak.hu/images/files/93190031935.pdfIn PDF document text
    • http://soosanfix.com/upload/fckeditor/file/43605859814.pdfIn PDF document text
    • http://infosierra.es/images/editor/73136905950.pdfIn PDF document text
    • https://0a3exp.com/upfiles/editor/files/pipixawaw.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/161313bcd67172---xatijunimafumo.pdfIn PDF document text
    • http://www.childofafrica.org/media/userfiles/file/59194268679.pdfIn PDF document text
    • http://stavo-bazar.cz/userfiles/file/jesepanesizatisome.pdfIn PDF document text
    • http://fazendasaojudastadeu.net/fotosempresa/files/savamawomugekis.pdfIn PDF document text
    • http://romangruszecki.com/uploaded/file/43672623949.pdfIn PDF document text
    • http://e-district.org/userfiles/file/78334249331.pdfIn PDF document text
    • https://marathonlaval.com/userfiles/files/bubarubefa.pdfIn PDF document text
    • http://ayurveda-shiatsu-qigong-nice.com/upload/files/rerasije.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613f8e5301ff1---boxisorigewuzivi.pdfIn PDF document text
    • https://optimustelecoms.com/ckfinder/userfiles/files/83938432627.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=me+myself+and+irene+123PDF link annotation
    • https://tes-sys.com/uploads/ckfinder/files/20210908/16311073723788.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bb28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB28 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d33f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD33F 10748 bytes
SHA-256: d33c6dedfa6c8fe4854f141b27280764d9cf8dda6ee2e769319dfad246d8da0d
font_02_sfnt_off0000ec05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC05 17200 bytes
SHA-256: ca09e9b85d617077494bd9abef62ed7a2ccdd543630a37f8520ad1208db2cd1f
font_03_sfnt_off00011833.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11833 17372 bytes
SHA-256: f27dbd292192704405db10e4d8e6f8156eb3bee357cb3a36f34dcbd3656db2bc

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