Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ca6ff4871b9bc32…

MALICIOUS

PDF

81.2 KB Created: 2021-09-20 01:53:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f1bb6bd195e74649d386a5d68d14c413 SHA-1: b6238ad7c89fcdbfe3c65dee57869d38693afc00 SHA-256: 5ca6ff4871b9bc32c091c24ae3eb1afdea231635e251d06961101acc453f1c10
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external websites, many of which are hosted on disposable domains or compromised CMS uploads, suggesting a link farm used for phishing or malware distribution. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM indicate a pattern of using such sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or trojan delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://nomylo.ru/uplcv?utm_term=video+converter+for+android+mobiles PDF link annotation
    • https://ceccardolj.ro/userfiles/file/61876512208.pdfIn PDF document text
    • http://clinivetmadonnadirosa.eu/userfiles/files/nikiterike.pdfIn PDF document text
    • https://nuteuit.ro/ckfinder/userfiles/files/tewixigobujejexujan.pdfIn PDF document text
    • http://sfalojistik.com/userfiles/file/20412413104.pdfIn PDF document text
    • https://accidentmatters.com/ckfinder/userfiles/files/28664774955.pdfIn PDF document text
    • http://montpellier-businessplan.com/mbp/upload/images/images/upload/ckfinder/19150257873.pdfIn PDF document text
    • https://gkscam.com/userfiles/file/38790613152.pdfIn PDF document text
    • http://bsa-billiard.by/images_from_html_editor/file/lumivogekilobemelevemed.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132d31bac62c---37835332809.pdfIn PDF document text
    • http://rencontres-icare.org/userfiles/file/97154061894.pdfIn PDF document text
    • http://kedehg.com/ckfinder/userfiles/files/depojedaxuderejotubog.pdfIn PDF document text
    • http://italianopizzeria-pg.com/uploads/files/2439171302.pdfIn PDF document text
    • https://suprastoc.ro/userfiles/file/14169037368.pdfIn PDF document text
    • http://fujavietnam.com/images/Download/84311110927.pdfIn PDF document text
    • http://realtor-madrid.com/uploades/fckeditorfile/97655493333.pdfIn PDF document text
    • http://yhbinternational.com/userfiles/file/13583378927.pdfIn PDF document text
    • http://oilspecchem.com/files/50631409162.pdfIn PDF document text
    • http://coeb.eu/userfiles/files/nipako.pdfIn PDF document text
    • http://xn--80aafmoni2biho.xn--p1ai/admin/ckfinder/userfiles/files/durujiviwo.pdfIn PDF document text
    • http://architettotamborra.eu/userfiles/files/pejex.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d7429921ec---51987421464.pdfIn PDF document text
    • http://hani-bee.com/userfiles/files/32240421117.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16147a5fec65bb---42793443449.pdfIn PDF document text
    • https://coverline.ro/userfiles/file/xesudamoke.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_off0000d974.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD974 17320 bytes
SHA-256: 63fa1ae6fa270d8619a24a3185eca6e0501f4fdebd2c08626151e000bfec5889
font_01_sfnt_off00010640.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10640 10812 bytes
SHA-256: ef61713a02edb8f0f1a2800337cb734a8cf7ff7825a5240a69fe50885120fd98
font_02_sfnt_off00011f2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F2E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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