Malicious PDF — malware analysis report

Static analysis result for SHA-256 45c2cbbedb8d7b5e…

MALICIOUS

PDF

70.9 KB Created: 2021-09-25 05:28:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6d85f2331fffe1236925aea70c257803 SHA-1: e07017951a68a78366b81716f39aba07f8f8736c SHA-256: 45c2cbbedb8d7b5e5635c9c20cffcc3e4eac6f163076971e6bcc08f61f73d212
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs pointing to various domains, many of which are associated with compromised CMS uploads or disposable hosting, indicative of a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution through these links. The file's structure and heuristic firings align with techniques used to lure users to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://garglob.ru/uplcv?utm_term=floating+tube+player PDF link annotation
    • http://myblindz.com/fck_user_files/file/80008344862.pdfIn PDF document text
    • https://penal-garazh.ru/files/ronopapevalonosovoduj.pdfIn PDF document text
    • http://muntepa.com/userfiles/files/fowamojoguwifen.pdfIn PDF document text
    • http://redigonda.it/userfiles/files/kusibeg.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c02bf18d29---15470375602.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161315593b3d4e---8995791138.pdfIn PDF document text
    • http://nikolalepojevic5.com/multimedia/file/rilulaw.pdfIn PDF document text
    • http://plaschke-partner.com/uploaded/file/24632467953.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614b1bf7e6cbe---wuxeped.pdfIn PDF document text
    • http://pharmabiosolutions.com/filespath/files/20210906225343.pdfIn PDF document text
    • https://www.milestonesmn.org/ckfinder/userfiles/files/nubukerozin.pdfIn PDF document text
    • https://rumahbaruku.com/contents/files/nejivopu.pdfIn PDF document text
    • http://abwvictory.com/uploads/files/85594438793.pdfIn PDF document text
    • http://fcraregistration.com/UploadedData/file/lirel.pdfIn PDF document text
    • http://ydyb.com/filespath/files/20210904030638.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/4697b939a7a5716fb0261617ca0a8db7/fosabegowadunemek.pdfIn PDF document text
    • http://alianzablue.com/aym_image/files/63678524491.pdfIn PDF document text
    • http://daotaoyduoc.org/wp-content/plugins/super-forms/uploads/php/files/d6a2a26f6c3b00a92ae5598dc6146cb4/91190065075.pdfIn PDF document text
    • https://adci.vn/data/upload/file/82862523795.pdfIn PDF document text
    • http://sriagasthiyarastro.com/FCKeditor/userfiles/file/zonejudevelakorimegojapu.pdfIn PDF document text
    • http://shendaoguoji.com/data/attachment/file/dawewiguxazurutagijawet.pdfIn PDF document text
    • http://igigeothermal.jp/userfiles/file/dawupoj.pdfIn PDF document text
    • https://seedcambodia.org/htdocs/cljr/data/files/58263384995.pdfIn PDF document text
    • http://arunimaflavours.com/userfiles/file/fulifowex.pdfIn PDF document text
    • http://dobrejaja.com/Upload/file/55191551951.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_off0000b46f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB46F 16344 bytes
SHA-256: b6c8606e04d506fecdc97d370db718c6d37b52eb2d83e3a61119c71308dc5a80
font_01_sfnt_off0000ddc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDC1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f5d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5D8 10592 bytes
SHA-256: c02cfce6d8a88a042f6a49548ce349d1354a9a220793333cd8de4636834fdd01

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