Malicious PDF — malware analysis report

Static analysis result for SHA-256 31a49382bc172c26…

MALICIOUS

PDF

76.1 KB Created: 2021-08-31 21:56:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 161544b894d5e67e16a76f6956fb8d2d SHA-1: 6ff5063619c822d63f810781297b8206c2d556df SHA-256: 31a49382bc172c2610e43cab09c98fcca2b556cf1fbcd6348ac518118ff1eca7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://pixomot.ru/uplcv?utm_term=pdf+technical+analysis+of+stock+trends PDF link annotation
    • http://rustproofingottawa.com/userfiles/file/jidedul.pdfIn PDF document text
    • http://liebherr-tr.com/userfiles/file/74190371013.pdfIn PDF document text
    • http://zxpgw.com/userfiles/file/lebafa.pdfIn PDF document text
    • http://techscreening.com/userfiles/files/zefekis.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160984256d7016---lekelovonugon.pdfIn PDF document text
    • https://geneticapanama.com/userfiles/file/gemekulufalovevati.pdfIn PDF document text
    • http://cocoal.com/uploads/file/74631683766.pdfIn PDF document text
    • http://izumrud38.com/ckfinder/userfiles/files/wovubokikejutobukowi.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096dc1f339b8---jagifedubome.pdfIn PDF document text
    • http://konditsionery-reutov.ru/upload_picture/file/15507340931.pdfIn PDF document text
    • http://mayjack.com/upload/files/6337940345.pdfIn PDF document text
    • https://lymfologi.se/anvandarbilder/221/files/945744669.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160851358ca450---67558951836.pdfIn PDF document text
    • http://vervesimuhub.com/userfiles/file/18417977407.pdfIn PDF document text
    • http://unitec-egypt.net/userfiles/file/sevisemenu.pdfIn PDF document text
    • https://sabagdasarov.ru/upload/file/57682215949.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/57b479bfd7d2bb92db602451e87733a6/difomokedugemuforuvelu.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/1bcf621bfba914a6163e5a3dd03347d5/24573358965.pdfIn PDF document text
    • https://space1500.com/wp-content/plugins/super-forms/uploads/php/files/ed03d8702653d11351d3002f58c938dc/rufisevaxulanidexumikuvip.pdfIn PDF document text
    • http://bigxra.com/uploadfile/file/2021061722192873499.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_off0000c44b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC44B 17448 bytes
SHA-256: 465409384cfdf470a7d5d6714fb7ef8b72eb8e92008faef4085e13f6d56b25c4
font_01_sfnt_off0000f150.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF150 10780 bytes
SHA-256: 32e897af272b553ca261b4ccdb30c65bce7cfd6bc032c1079749fe3984dccb71
font_02_sfnt_off00010a1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A1C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1