Malicious PDF — malware analysis report

Static analysis result for SHA-256 4eae65d4f1067cc1…

MALICIOUS

PDF

72.5 KB Created: 2021-10-07 21:12:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 55c766cbd44e55328835c87152be5862 SHA-1: 2b7eb33d7d44221646bbadad3a4e1bd1826a6a9c SHA-256: 4eae65d4f1067cc149041be5964f021431a9dd42fb22701024b62ba8c2716bf3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised WordPress upload storage and disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the nature of the URLs and the detection suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://wastran.ru/uplcv?utm_term=6+usd+to+thb PDF link annotation
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161354508b8a87---xexaxojoveludeketikefub.pdfIn PDF document text
    • https://www.retake.dk/ckfinder/userfiles/files/mawizadudonupumapi.pdfIn PDF document text
    • http://torby.kbo.pl/ckfinder/userfiles/files/jomigufotuwekenumowaj.pdfIn PDF document text
    • https://agroadvanced.com/app/webroot/newsletters/editor/files/nitepimusetegopefikowumaj.pdfIn PDF document text
    • http://aerotherminsulation.com/userfiles/file/fukukutikoxovapologode.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16152a1045a062---wakezabe.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615a4cca6ff63---39307620510.pdfIn PDF document text
    • https://sandipkumardutta.com/ckfinder/userfiles/files/36870320680.pdfIn PDF document text
    • https://goldfieldssanddrags.com.au/ckfinder/userfiles/files/luzegegupejujipotuker.pdfIn PDF document text
    • https://www.natursany.com/ckfinder/userfiles/files/57313481615.pdfIn PDF document text
    • https://beyondpins.com/calisma2/files/uploads/juzibavarejakupapezoret.pdfIn PDF document text
    • http://longbeach.ilovepokebar.com/uploads/files/jabivirirosotilepezof.pdfIn PDF document text
    • https://cowik.pl/upload/roxibigag.pdfIn PDF document text
    • http://www.neoneophytou.com/ckfinder/userfiles/files/76580128598.pdfIn PDF document text
    • https://istanajp2.com/contents/files/46579651638.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142389fdf6d4---29872390421.pdfIn PDF document text
    • https://rosenstein.lu/userfiles/files/nogomiverujotitaz.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/48a2562799f61be9fc02df515536583f/nupobutaj.pdfIn PDF document text
    • http://ekstelekom.com/userfiles/file/kuzarupoj.pdfIn PDF document text
    • http://webinaris.org/ckfinder/userfiles/publics/files/murovirenopixitonud.pdfIn PDF document text
    • http://preiss.at/upload_files/files/zewiwotomun.pdfIn PDF document text
    • http://pravkniga.ru/files/userfiles/files/vuzujufabotu.pdfIn PDF document text
    • https://picinterior.com/ckfinder/userfiles/files/delepixow.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_off0000bc9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC9D 10020 bytes
SHA-256: aaa2fb1c7f3ef439e1166880dd8191fda8a27e72a2be15d580bbce8259a3cd31
font_01_sfnt_off0000d2fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eb0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB0E 16000 bytes
SHA-256: bf64c9125471f6702160937e235c574137141c74101921e98f438cf19b1d6b09

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