Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fc7d29358639e61…

MALICIOUS

PDF

88.2 KB Created: 2021-09-05 16:46:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: db33c203c3921c161ebbd696d51cacd2 SHA-1: 9c1f6b0531b68ce1c1d14ffa45becf3a78658451 SHA-256: 9fc7d29358639e61a2f4b5c97fbd89da4deef650df0867c3cbef7170051fac0e
156 Risk Score

Malware Insights

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

The file was detected as a malicious PDF by multiple engines, including ClamAV. It contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, suggesting a phishing or malware distribution attempt. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://betenenergy.com/sites/default/files/file/36370173853.pdf In PDF document text
    • http://xn--h1acbpobggs.xn--p1ai/data/files/27319188889.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16133c1b5c4fbb---45111747275.pdfIn PDF document text
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/d42fad76f3e3feea7314d90dc20dc2fa/judabilonavibo.pdfIn PDF document text
    • http://nfc.soo.jp/file/41245177875.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d0732339bc3---79203111465.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160887453b5b7e---91232745774.pdfIn PDF document text
    • https://serwisnawigacji.pl/userfiles/file/kulofumozafutu.pdfIn PDF document text
    • http://tulsamemorialclassof71.com/clients/84987/File/69529204113.pdfIn PDF document text
    • https://fsreloading.com/userfiles/files/58012551270.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160838d57ce43a---56385037345.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1610f9e62e05d1---77953288106.pdfIn PDF document text
    • https://marljivo.hr/userfiles/file/rukawoz.pdfIn PDF document text
    • http://sochi-polyana.com/ckfinder/userfiles/files/52247532388.pdfIn PDF document text
    • http://suapaiatuipelehakefamily.com/clients/80707/File/raguw.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/fapaxiwemuta.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/nrm8m7gbvu2vpec0heiie9tfk7/17380825655.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/3af9cfa063a92af7d9f1b8ca1e32e96f/tatif.pdfIn PDF document text
    • https://radmangroup-ye.com/rgfiles/file/fozenevimenaxozadi.pdfIn PDF document text
    • https://noriupapildu.lt/ckfinder/userfiles/files/54425725014.pdfIn PDF document text
    • http://geteffective.biz/uploadfiles/file/10160101862.pdfIn PDF document text
    • http://greenbrier101.com/userimages/41025821592.pdfIn PDF document text
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/05dbmvnnfulhuapvscj6a2dh14/71610968563.pdfIn PDF document text
    • http://studioassociatoemc.com/userfiles/files/57279647711.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e44204d6821---demetezeziw.pdfIn PDF document text
    • http://xn--80akazwaeiw.xn--p1ai/editorfiles/file/8444807950.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=dvc6200+sis+manual+pdfPDF 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_off0000f3ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3EC 10908 bytes
SHA-256: 91f20676a3e7aaa3b875222edcbc4d2bb452950f252e9a5d2b65bec5799a5e83
font_01_sfnt_off00010d3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D3A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001254c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1254C 17448 bytes
SHA-256: b8120bde92e77d61392842b64cb3d7ae79cf9732b4e8f712919d772fb8d9d5e0

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