Malicious PDF — malware analysis report

Static analysis result for SHA-256 def8733948f84cb4…

MALICIOUS

PDF

70.7 KB Created: 2021-09-26 07:13:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: bd4afbf3bcf4711abb79069bbb477616 SHA-1: 6c445e95a936bda9fdf45f54032580320a6650b6 SHA-256: def8733948f84cb4e044b4c8494a89917f52faa1530fd4d350e401cb54b98039
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. The use of compromised CMS uploads and SEO link farm techniques further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 https://vanvoorst.info/uploaded/file/57374970279.pdf In PDF document text
    • https://ecohort.info/userfiles/files/74774495923.pdfIn PDF document text
    • http://bright-inter.com/file_media/file_image/file/makadatorisabulaf.pdfIn PDF document text
    • http://big-blue-bus.com/pics/fotos/1/file/fodefawonozajotipipotavo.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/kuvebenet.pdfIn PDF document text
    • http://marketingnews.fr/images/file/merikitamukiwazejot.pdfIn PDF document text
    • https://yuanfuconstruction.com/ckfinder/upload/files/zadufivugog.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/6m3re8n6l6s5i2ic8hri723lc3/45366703844.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148b8bcab7d8---94009502390.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614fc71ad300e---76981623582.pdfIn PDF document text
    • http://orderleesushi.com/uploads/files/fixizovotiroguge.pdfIn PDF document text
    • http://geo-equipe.it/userfiles/files/dezeforuzedixepajine.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161301e86b9ccc---34607318476.pdfIn PDF document text
    • http://5thaveseniors.org/userfiles/file/49988992881.pdfIn PDF document text
    • https://www.gitialiganjlko.org/ckfinder/userfiles/files/bawowo.pdfIn PDF document text
    • https://rux-thai.com/ckfinder/userfiles/files/nigunanevufu.pdfIn PDF document text
    • http://polimak.pl/userfiles/file/171567559.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/1613f5b48a2465---34104453123.pdfIn PDF document text
    • http://studiopedrazzini.eu/userfiles/files/rebosupeguzekesulatubo.pdfIn PDF document text
    • https://dobre-akce.cz/media/files/file/natetenetedexovugi.pdfIn PDF document text
    • http://xn--80aaae7amexjfdlfdfg.xn--p1ai/files/file/nipifozikepakipidem.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/xogubamizifubejafekij.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=lose+your+weight+rujuta+diwekar+pdf+free+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_off0000afce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFCE 11256 bytes
SHA-256: aacbc38fbad357976748693d3b202a79cf68a864ccda69db6214e008bedcb84a
font_01_sfnt_off0000ca07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA07 16852 bytes
SHA-256: 9d26e843070c70c0db1c09f9188b05aaea0a3b4c31a1c30f5ac8cfeec58bef33
font_02_sfnt_off0000f515.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF515 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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