Malicious PDF — malware analysis report

Static analysis result for SHA-256 a256747b698f26d3…

MALICIOUS

PDF

75.4 KB Created: 2021-09-04 15:36:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 725cdbc85a41c5c7183f770e96ef1820 SHA-1: df5dc3d5a9a1559bc0f206067b12c3444c7a346d SHA-256: a256747b698f26d305eed1cfb044a6e13af758bdab7f3c5d54d26bc79761effc
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS upload storage or disposable hosting, suggesting a link farm for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing a trojanized PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://np-laser.com/upload_fck/file/2021-7-12/20210712211704637252.pdf In PDF document text
    • http://wang023spa.com/userfiles/202108file/2021083113014970554.pdfIn PDF document text
    • http://toptoptraining.ru/img/upload/file/31527870535.pdfIn PDF document text
    • http://fairmonteast1978.com/clients/71195/File/36208800635.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160751b0f0bb05---3039522208.pdfIn PDF document text
    • http://xn--b1agjlwjc3g.xn--p1ai/ckfinder/userfiles/files/70123242318.pdfIn PDF document text
    • http://circuitvietnamcambodge.com/hinhanh/file/xelebemuxujedipotabugese.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608e5f424a96b---52110724198.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba61461f09c---sijekawipisumedexog.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160827aa4e5883---gufirivemapolekozesev.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/562cd4f472746593b156027266637d70/fozeperarifawamusume.pdfIn PDF document text
    • http://elesi.eu/fichiers/files/gosuxarusigavaje.pdfIn PDF document text
    • https://scalper.ir/data/files/file/754943799.pdfIn PDF document text
    • http://wksystems.net/HotelEstimator/userfiles/file/17289922479.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd07f47e7e0---35689165612.pdfIn PDF document text
    • http://defhjdrjioo.friend-match.com/upload/files/86730628834.pdfIn PDF document text
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/fokijudej.pdfIn PDF document text
    • http://mobilephleb.com/clients/2/2d/2d2188d13063160162e6e2bbcdac547d/File/72833449843.pdfIn PDF document text
    • http://ageddfjtjgrade.pretty-match.com/upload/files/bowuzogitogexesuzab.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2518f9ffb2---97770987077.pdfIn PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ed92e96e2bfb98a6dcf5d232805aa130/favinujugam.pdfIn PDF document text
    • http://cistenivytahu.cz/upload/file/27957216711.pdfIn PDF document text
    • https://moolans.com/uploads/files/18758800012.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=disaster+management+tsunami+pdf+downloadPDF 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_off0000c352.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC352 11028 bytes
SHA-256: cd80e58729bb46745bc01d704a617c092efa8728cf7d31c1e9d48bc4075e184a
font_01_sfnt_off0000dcd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCD5 16288 bytes
SHA-256: 780ffff3e15426184330f74761bf5775bfcd101da40aac7a26f437812bdc259a
font_02_sfnt_off00010615.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10615 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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