Malicious PDF — malware analysis report

Static analysis result for SHA-256 a25c1716b11b8afa…

MALICIOUS

PDF

93.0 KB Created: 2021-09-08 10:55:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 801ecd491e879ec10d488681635c7edf SHA-1: dcd6b8df2cb9f86ea3e337832e2f1b15238eb3a1 SHA-256: a25c1716b11b8afaf58bf3d954c4947064df083377d2692043b45a8db8b6c4e1
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm for phishing or malware distribution. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a phishing lure, likely using JavaScript for exploitation or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://irlanc.ru/uplcv?utm_term=marcapasos+cardiaco+pdf PDF link annotation
    • http://oishisushigd.com/uploads/files/47530856983.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608655b7268d6---25674644924.pdfIn PDF document text
    • http://www.ssc-ras.ru/ckfinder/userfiles/files/62986289476.pdfIn PDF document text
    • http://www.tiendadelbordado.com/ckfinder/userfiles/files/10773075319.pdfIn PDF document text
    • http://radio-salsa.fr/php/rs/filesupload/file/566545106.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608ebcf0e2fe7---23087351993.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/3iea49o2dd04f8a5do98mq1c3g/50867527798.pdfIn PDF document text
    • http://lagunaapartman.hu/images/user/file/81223074542.pdfIn PDF document text
    • https://longhoang.vn/upload/files/2663210548.pdfIn PDF document text
    • http://koreaseals.com/ckfinder/userfiles/files/18269618613.pdfIn PDF document text
    • http://vds-construct.pl/userfiles/file/53887684016.pdfIn PDF document text
    • https://china-glass-mosaic.com/userfiles/files/20210816_003509.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/9451dff6aaae3f2022ee4351b984e7f2/wapupugijowe.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/fcn7n1udckmfkpocec65tt343i/50447377350.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/a06rfjrndh8k302gvgf2d0b290/xivomiwiwerip.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/p10lkmrrohnmvk28rdogovr9l3/suberi.pdfIn PDF document text
    • http://svaz-podnikani.cz/files/file/fosodados.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161029ac3db2c1---fabivegifatafalez.pdfIn PDF document text
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160abb1eaa28b7---noxagu.pdfIn PDF document text
    • http://gibeaufamily.com/clients/870383/File/43246844177.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/160b7585ba577e---2632787192.pdfPDF link annotation
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160745f36f0092---pigow.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/92lmo3eb50ge17h1rhhvt7t342/76754093105.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5366c81807---xoresuzexuxenugenobota.pdfIn PDF document text
    • http://theleadershipworks.com/PO2/UPFILE/userfiles/files/zabevor.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_off000104b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104B3 10228 bytes
SHA-256: 566b80eeae0c847f5436cbaff46b2a38c5601887f25dc96329af2ce620854f4d
font_01_sfnt_off00011bc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BC0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000133d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133D2 20200 bytes
SHA-256: b8da29d0604691ea46b1297afda3017926ae4209403eca92e4b0b1dc2b63f3d6

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