Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6e13f33c7324d6d…

MALICIOUS

PDF

84.6 KB Created: 2021-09-08 08:12:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e1f8d329dd489186d8354a7bb45e3041 SHA-1: ff9560f91c3f77ecd9e2fc4de8a360b1c8c72721 SHA-256: f6e13f33c7324d6d6a3b2cfacaf324c893c1aef212a22256046b395dda6ee9a0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious redirection tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://medvor.ru/uplcv?utm_term=3rd+grade+standard+form+math+worksheets PDF link annotation
    • http://soncongnghiepjotun.com/media/ftp/file/36453698347.pdfIn PDF document text
    • http://kaies.cn/upfiles/file/50959739293.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/1607506888d48d---gegira.pdfIn PDF document text
    • https://foxtailmag.net/wp-content/plugins/super-forms/uploads/php/files/900ad43dd7a4738a724e595191974372/newekubuzokuputupesigamav.pdfIn PDF document text
    • http://5percent-design-action.com/upload/users/files/44159936301.pdfIn PDF document text
    • http://cuatudongbinhduong.net/uploads/files/50752112471.pdfIn PDF document text
    • http://ingatlantv.tv/userfiles/files/91410055038.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/16134ca700650d---25525223116.pdfIn PDF document text
    • http://tunglamgarden.com/images/fck/file/ninimaruva.pdfIn PDF document text
    • https://kohphanganhotelandtour.com/userfiles/file/63155574987.pdfIn PDF document text
    • http://modnyi-buket.ru/uploads/files/40718989840.pdfIn PDF document text
    • http://dzbnf.com/upload/file///16362241163.pdfIn PDF document text
    • https://rosedreamholidayhomes.com/ckfinder/userfiles/files/jopowe.pdfIn PDF document text
    • https://vpmemorial.net/images/file/zowobukufasepu.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/cb7e53ac64c07055a5f8f7895f1e736d/jixebofunibil.pdfIn PDF document text
    • https://lufty.cz/UserFiles/files/zawodujada.pdfIn PDF document text
    • https://butagallery.com/userfiles/files/69205200773.pdfIn PDF document text
    • https://eghamatkade.com/basefile/eghamatkadecom/files/fijijikozobopeduxer.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16077bd91ca96e---91520182487.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160864ce473ef7---govulafepegejevotumavovu.pdfIn PDF document text
    • https://mbzgogo.xyz/web/img/podborky/files/dutoruvi.pdfIn PDF document text
    • https://mosconi.net/userfiles/file/rudonipivadikajikurafi.pdfIn PDF document text
    • https://kodcomputers.ro/2664/uploads/66386439175.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_off0000e57c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE57C 17784 bytes
SHA-256: e0b2be0fef5e951cd732d4af379bb698b499ba2203a2d12ee1f248e7fea2b21a
font_01_sfnt_off000113cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113CC 10916 bytes
SHA-256: a54914bb3f20b81c68f08de917d7e1408490e0449e1f49f8e230a6e054a6d7b8
font_02_sfnt_off00012cc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CC3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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