Malicious PDF — malware analysis report

Static analysis result for SHA-256 85a37caece80d7cb…

MALICIOUS

PDF

76.3 KB Created: 2021-09-02 23:21:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: df0b6704232df141ce2ad2691ee64e1b SHA-1: fcc48eef845e9073ff54307aa7cfbf6f980f65c6 SHA-256: 85a37caece80d7cba6daf911d4ae43aa37ecd42c2fd6132bb5b5d6758ace2b5f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The document contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicates an attempt to disguise malicious links within seemingly legitimate document structures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://infrive.ru/uplcv?utm_term=wiper+motor+wiring+diagram+pdf PDF link annotation
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/h49ulhm2gfn1cruhrlc0ul4i06/devejavadapirijitewin.pdfIn PDF document text
    • http://nandishoverseas.com/UserFiles/File/tadajime.pdfIn PDF document text
    • http://agriturismolescuderie.eu/userfiles/files/87755912755.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/5vmtmbtj6e1m5092k2fv5sgtk7/bipopukudod.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606c78c9e249c---nukekaxiresekomiz.pdfIn PDF document text
    • http://bagiez.com/userfiles/file/65370065441.pdfIn PDF document text
    • http://zulaikhatextile.com/userfiles/files/16724280391.pdfIn PDF document text
    • http://michellesmithscott.com/clients/36670/File/63029542704.pdfIn PDF document text
    • https://kaowei.tw/image/files/20210816_072624.pdfIn PDF document text
    • http://kagoshimakojintaxi.com/userfiles/file/ditowabuj.pdfIn PDF document text
    • https://kltccompany.com/ckfinder/userfiles/files/61142411688.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608617c78b4e5---95487034549.pdfIn PDF document text
    • http://ahrestygz.com/userfiles/files/20210607_051232.pdfIn PDF document text
    • http://starcity-vinhomes.vn/app/webroot/img/files/63865531371.pdfIn PDF document text
    • http://allaboutdowney.com/userimages/80310356788.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608397ff71f36---zenum.pdfIn PDF document text
    • https://securityguardsupply.org/php/uploads/file/mixibofidar.pdfIn PDF document text
    • http://julianowka.pl/ckfinder/userfiles/files/45073311328.pdfIn PDF document text
    • https://www.akilciilacdernegi.com/ckfinder/userfiles/files/lamagitujodisiguloxaw.pdfIn PDF document text
    • http://www.ecvbrass.ch/user/web/file/47671453506.pdfIn PDF document text
    • http://sammyuriasproperties.com/userfiles/files/89129198393.pdfIn PDF document text
    • http://aodaibooking.com/FileData/ckfinder/files/20210627_1182190AB32F0D13.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090d75bc64ca---12589665576.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/20215132252579072.pdfIn PDF document text
    • http://iberia-ex.com/images/blog//file/lutolaxipatopajos.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_off0000c7d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dfe2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFE2 17060 bytes
SHA-256: 07bc6978da8516dd74eb6831f171facd9bf251eb52eb2e4e658e0fd81e7dffd3
font_02_sfnt_off00010b3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B3B 10708 bytes
SHA-256: 83737ead10493955713a7a53934f13521ef4471c06b9b0ddbae2e674bbd84c78

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