Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb9c616c94c26497…

MALICIOUS

PDF

86.6 KB Created: 2021-09-05 14:05:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 003593ca57da43577fc6a9f61c085049 SHA-1: a985080f05fa5012efd9023b458d30bfa8f7fd00 SHA-256: eb9c616c94c26497f51cfc2043060b89c932a7902a5349ba64c1514bdb52d018
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that form a link farm, with several pointing to compromised CMS upload storage and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution via these links. No scripts were extracted, but the structure suggests a malicious document intended to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://pistant.ru/uplcv?utm_term=describing+words+worksheets+for+grade+2 PDF link annotation
    • https://tavio.ru/files/file/pekevoroz.pdfIn PDF document text
    • https://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/2671110365.pdfIn PDF document text
    • http://sns.hu/_user/file/semuma.pdfIn PDF document text
    • http://www.drivingschool-brno.cz/files/files/degebonopiwifokiji.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a2432cc03f1---matusasefuxalok.pdfIn PDF document text
    • http://chipgene.com/image/files/20210703_233601.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/6u3cb7827s00tqrtjbhnag6m7j/rukexikekumuluwaka.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/994ffa3f12b638e2b53603a693cf1eb8/siduxo.pdfIn PDF document text
    • https://bunyaminerdemir.com/resimler/files/walopamuparokeputinewajin.pdfIn PDF document text
    • https://chokysitohang.com/Uploads/userfiles/files/63062998136.pdfIn PDF document text
    • http://kingsfinancialconsulting.com/userfiles/file/57151864103.pdfIn PDF document text
    • http://dambi.pl/userfiles/file/ganofezepalemegada.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/f62b3a5deb69f5933945c469387f9325/lisowexorixatijujapu.pdfIn PDF document text
    • http://abwjefferson.com/uploads/files/66972770726.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073750abb5bb---27216726871.pdfIn PDF document text
    • https://www.mii.net/wp-content/plugins/super-forms/uploads/php/files/cfa791f84722e8ec24135837e5cda871/petele.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608c3f46dc3bc---lenetukixikuli.pdfIn PDF document text
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/282f9084c9a988d8e7dd777fabc2fe7b/51576185524.pdfIn PDF document text
    • http://belgium-ex.com/images/blog//file/jijut.pdfIn PDF document text
    • http://immobiliareborghi.com/userfiles/files/57363265429.pdfIn PDF document text
    • https://aquafilling.com/userfiles/file/13230318736.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab777be5ee0---vilowinepibuvo.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_off0000e7d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7D6 11148 bytes
SHA-256: ef8a6a3863a79408f04adb2aff145d622437c7b7ca94ceabcbe0b2b772e1f5e1
font_01_sfnt_off000101c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101C6 19232 bytes
SHA-256: d1b6207cedb5b8d3e49583c8bc577cd3b44dfec9b6014ad5c632b5ed62c60fcc
font_02_sfnt_off00013449.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13449 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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