Malicious PDF — malware analysis report

Static analysis result for SHA-256 330f526b9e63222c…

MALICIOUS

PDF

87.9 KB Created: 2021-09-07 01:44:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6837f505f5c1b56f55ac424be1228b17 SHA-1: 69628f2fe0d00e777e8797420284fc0ceef46ddf SHA-256: 330f526b9e63222cd4b5c7f939f5d6b65e06b3b5a7fb0c7169467871d09c2cae
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that form a link farm, directing users to potentially malicious or phishing websites. Heuristics indicate the PDF is designed as a link farm on disposable hosting and points to compromised CMS upload storage. While no scripts were explicitly extracted, the ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://chcial.ru/uplcv?utm_term=repulsion+motor+pdf+download PDF link annotation
    • http://dbhsreunion.com/clients/21010/File/gowatusidotulixufidijo.pdfIn PDF document text
    • http://kidsjeodo.com/images/files/21068138570.pdfIn PDF document text
    • http://bitree.net/ckfinder/userfiles/files/94020295833.pdfIn PDF document text
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc55dc8d58---4631497820.pdfIn PDF document text
    • http://yachtandgulet.com/userfiles/file/bumasuzugetitelegebi.pdfIn PDF document text
    • http://angerdress.store/ckfinder/userfiles/files/vokebowivefulavomawakuki.pdfIn PDF document text
    • https://baatco.com/ckfinder/userfiles/files/medenuvowutisewu.pdfIn PDF document text
    • http://kmjmt.com/news/upload/file/2108250312042843601t4xkt.pdfIn PDF document text
    • http://agisma.ru/files/pages/files/suvazoniletokorug.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1607208657d92d---27000922370.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/5a9d1b3ed95763538206ccd0ae37afd6/rilap.pdfIn PDF document text
    • http://www.radeton-cz.vasestranky.cz/ckfinder/userfiles/files/15701499412.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/ee1fdde20138c27c5d0e3a5080fcc209/38120245660.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160d22e3d9dac4---45192188756.pdfIn PDF document text
    • https://yocarbroker.com/upload/ckfinder/files/14748715209.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/fufixudafifopitubokokesu.pdfIn PDF document text
    • https://willmarareachamber.com/ckfinder/userfiles/files/1505814209.pdfIn PDF document text
    • http://getampedmag.com/ckfinder/userfiles/files/dowededinukabero.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/e2f6d7ccbebb25619576e7f509139ef7/vejojugiposamerufop.pdfIn PDF document text
    • http://ginzaoakland.com/uploads/files/nakixerobiwiwekuru.pdfIn PDF document text
    • https://totounited.com/contents//files/bolulevoforudax.pdfIn PDF document text
    • http://stananddiane.com/clients/6/67/672a2699e369d648dd23e03de9deda78/File/jiledale.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_off0000f2bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2BD 17856 bytes
SHA-256: 2a62cb08566185b30545fb69e2e1d723b8abfc809065474cfe63721b76af15ae
font_01_sfnt_off0001210c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1210C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013923.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13923 10892 bytes
SHA-256: 6b7203a93348467f780a8641792f17f70facf7551a8d073ecba725cf489d3cb3

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