Malicious PDF — malware analysis report

Static analysis result for SHA-256 c28a5db816d3a172…

MALICIOUS

PDF

92.2 KB Created: 2021-06-09 17:26:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 19494786aa78aaa9deb43464729a73da SHA-1: 9e13f5183e0cd59ec5191710f3ccef192c1b2ace SHA-256: c28a5db816d3a172e181a5595cdcc9461668fae54292c29f10176ac7921124c3
156 Risk Score

Malware Insights

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

This PDF document is classified as malicious, exhibiting characteristics of a phishing lure. It contains numerous links, many hosted on compromised WordPress sites, designed to trick users into downloading further malicious content. The presence of 'utm_term' parameters in some URLs suggests an attempt at tracking or SEO manipulation for malicious purposes. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://wastran.ru/uplcv?utm_term=jenda+pai+kapiraju+movie+online PDF link annotation
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/varhrng1rr44am0rc090bn8ea4/mebubufi.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/tasakunupizofaduv.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/17f710880b7f62dd3dbe8108ed0f1f49/29164007520.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a8443b824c---48305475969.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/b9ef99d2e975eec32cfb1653fb26a036/veriburegilarozugotidit.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/160881d562bc59---dezulikokakufuvajonowep.pdfIn PDF document text
    • http://ptaki.info/imgekoprojekty/files/95409670442.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a84d84d3d65---5087913952.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090a5826f2b9---34665456010.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606ec05d8dcbd---xeroxawekugezedalusofim.pdfIn PDF document text
    • http://dzbnf.com/upload/file/%5C/72549286222.pdfIn PDF document text
    • http://bajajsports.com/userfiles/file/65551181320.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16075b935cfe2d---7188360927.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/zunevumiza.pdfIn PDF document text
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/a7bq8j6u4ac7a2o3c08mi1a0vu/nugemeri.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/a78333c62ca8f650be7d6c9bd985289f/nofazizanuwet.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607e28d950e1e---1265971769.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn 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://scripts.sil.org/OFLIn 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_off00010a8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A8B 5116 bytes
SHA-256: d9bac1764c2df4c9c0ae329c0cb6ebafd522eae426fb2d7853ff8e39dea991ac
font_01_sfnt_off00011be8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BE8 2672 bytes
SHA-256: a387733016fb79ef13398b76a2edda70bb5b05c9d6a5c02f72273b7fc3a114b5
font_02_sfnt_off00012723.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12723 11436 bytes
SHA-256: bf4611fcb3b9c0d9818efb0d58286dec199b827a58486b37190919e98fbc4736
font_03_sfnt_off00014d4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D4E 16260 bytes
SHA-256: a55aa4a90b8ef9022898619be7e29efb3b6bee788d04f3664c04fe1dbdf4821d

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