Malicious PDF — malware analysis report

Static analysis result for SHA-256 68536d0edd4d4038…

MALICIOUS

PDF

70.7 KB Created: 2021-09-28 20:18:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9a457a13896dfb9df7ae2a4109bc53f1 SHA-1: 59834e87f4b4d7178d8e5ff52b064891faacabcd SHA-256: 68536d0edd4d4038569d47404fad7f8fbc78f767bf736e7214a4058c1f932477
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as a link farm, with many distinct hosts and disposable hosting detected. The ML classifier and ClamAV also identified it as malicious, specifically as a phishing trojan. The embedded URLs, such as 'https://inwebjor.ru/uplcv?utm_term=viva+video+editor+pro+mod+apk', likely serve as lures to direct users to malicious content or phishing 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://inwebjor.ru/uplcv?utm_term=viva+video+editor+pro+mod+apk PDF link annotation
    • http://www.salac.cz/ckfinder/userfiles/files/88041405976.pdfIn PDF document text
    • http://nifaelectronics.com/userfiles/file/29958977731.pdfIn PDF document text
    • https://mingyi-lock.com/data/file/userfiles/files/86035991905.pdfIn PDF document text
    • http://bagodilovaspark.hu/userfiles/file/dotegijutiravoguniwodiva.pdfIn PDF document text
    • http://dc-07b6a75bc4d0.breakthrough-physical-therapy.com/userfiles/files/43422989807.pdfIn PDF document text
    • http://pepinieres-soupe.com/userfiles/file/2747393331.pdfIn PDF document text
    • http://maximaviajes.com/FCKfiles/file/kuwijop.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139e817d4364---lekegifevug.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d99837043c---68979368594.pdfIn PDF document text
    • https://mollis.rs/files/85640339261.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ecda880eaf---jogusufafev.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/06c54bbfda22d98623cd8cd04eb63e41/ronux.pdfIn PDF document text
    • https://abouelhoulgroup.com/userfiles/files/70391451489.pdfIn PDF document text
    • http://nutrizionisti.eu/public/thread/risorse/file/majorisawakagawa.pdfIn PDF document text
    • https://zweefvlieg.net/userfiles/file/92800125853.pdfIn PDF document text
    • http://luckdidea.com/ckfinder/images_store/files/34935560249.pdfIn PDF document text
    • http://sola-brothers.com/userfiles/file/bokejupuzuwud.pdfIn PDF document text
    • http://88cpap.com/userfiles/files/ronobefumune.pdfIn PDF document text
    • https://procogs.com/FCKeditor/file/susojopamoj.pdfIn PDF document text
    • https://sakesushimn.com/userfiles/files/dujogepazogafunobizow.pdfIn PDF document text
    • https://ibexquimica.com.br/ckfinder/userfiles/files/20671924618.pdfIn PDF document text
    • https://tannhatviet.vn/upload/files/bopumejolujojaro.pdfIn PDF document text
    • http://adams-gold.ru/archive/image/file/86965670959.pdfIn PDF document text
    • http://isagenixmakessense.com/ckfinder/userfiles/files/sipofimimokuxewofanonad.pdfIn PDF document text
    • http://mariondhuique-mayer.com/data/file/83229538886.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_off0000b45f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB45F 16116 bytes
SHA-256: 6c019ccf61cb2f7c9f383baf828e5350d8d7107d73974210d73c81ca66111cd2
font_01_sfnt_off0000dd6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD6E 10364 bytes
SHA-256: 24c117a1fa09399fcf3d4fc31942f9b41ecc304d0e3848fc046af87cb2ad5f99
font_02_sfnt_off0000f4d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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