Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fd5b2e5653e6016…

MALICIOUS

PDF

69.3 KB Created: 2021-09-21 14:03:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: fc3361530f35f78b098885c119948d65 SHA-1: 7233a90c2af92dbcfb442ce1a527a19c9e15bb92 SHA-256: 7fd5b2e5653e601659e9b971a46f4effa203ff5ecc599060f41e8d2efbe08bc1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to lure users to potentially malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to distribute malware or redirect users to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://nomylo.ru/uplcv?utm_term=play+video+in+slow+motion+android PDF link annotation
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/lobegizadonoxerosojojoko.pdfIn PDF document text
    • http://octapus.vn/images/uploads/files/jinonob.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/0a2b9772ac2f728575abd8624a206b88/72161380944.pdfIn PDF document text
    • http://weingut-suppan.at/files/tuwepibesoli.pdfIn PDF document text
    • http://100gastro.cz/soubory/files/95507134519.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cb74b51298---22145689859.pdfIn PDF document text
    • https://mekongtransport.com/upload/userfiles/files/tozopotezinifetonug.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/123f3fdbea836a3c45dd1c57340010d5/sajevojufex.pdfIn PDF document text
    • https://takipcisec.com/calisma2/files/uploads/safasumo.pdfIn PDF document text
    • http://nhasachthunam.com/upload/files/wobigabufutik.pdfIn PDF document text
    • http://mjacz.cz/soubory/files/81253564233.pdfIn PDF document text
    • https://cfbadalona.net/ckdata/files/28066178515.pdfIn PDF document text
    • http://madinagirls.com/easydo%20v2.00/files/uploads/rewolugonuk.pdfIn PDF document text
    • http://eyupsifalibitkiler.com/resimler/files/bufimululikaza.pdfIn PDF document text
    • http://capitaldanceacademy.com/userfiles/files/20214297825.pdfIn PDF document text
    • https://catequesisnavarra.org/guiarte_userfiles/files/69764845321.pdfIn PDF document text
    • https://dangeloremodeling.com/nbloom/fckuploads/file/54586089377.pdfIn PDF document text
    • https://albertoangel.sinecsas.com/ckfinder/userfiles/files/73036569254.pdfIn PDF document text
    • http://carsonpokebar.com/uploads/files/seloxajakelijadada.pdfIn PDF document text
    • http://www.pro9apps.com/app/webroot/files/uploadimagesfile/36563421194.pdfIn PDF document text
    • https://www.serwkom.pl/plugins/ckfinder/userfiles/files/5432696003.pdfIn PDF document text
    • https://g55net.com/webpagebuilder/ckfinder/userfiles/files/mapoxikuvawekipakenoz.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/0d3c8ae6e4e7c10b9d82e96fcb4bfcee/jepivova.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_off0000b38c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB38C 10676 bytes
SHA-256: 3daa8c13eadb518b3cc2fa181eba3f926dd4ba1c06e5ef7df75efa524868570d
font_01_sfnt_off0000cc08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC08 14244 bytes
SHA-256: 0cc099fa3309ca9ce2ac0dd6bdf7f95d6cd8fbea25f62c3007153e1924871e5c
font_02_sfnt_off0000ef63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF63 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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