Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2ef07d11ba7dc5d…

MALICIOUS

PDF

91.3 KB Created: 2021-06-25 20:17:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8768614f94b16769de20882b6892ce29 SHA-1: fae8f0cca0092468116be6976466d2481400e4bb SHA-256: f2ef07d11ba7dc5d394b1ba32d72fa84f6b27274544e23b064dac670fedcbbfb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to obscure the ultimate destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://archism.ru/uplcv?utm_term=agriculture+budget+2020+pdf
    • http://better-pharma.com/images/file/files/posoge.pdf
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608110193512b---13060764092.pdf
    • https://dineflon.com//files/32552268410.pdf
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/fpi2m62bo5ig6qffqmjtmhda45/24528695529.pdf
    • https://oncallanatomist.org/ckfinder/userfiles/files/40286552243.pdf
    • http://lohsclassof70.com/clients/3/31/31ca850ff086a58b81c8700e10a01852/File/kixodo.pdf
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/d63289c1062717e7ff40507fe9106eaf/naguporet.pdf
    • http://aarogyamedico.com/userfiles/file/dolomomodonezabuvi.pdf
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/570a0f4031c8cd8c8f1a95f9f1dc0dac/didikumamuzavuxox.pdf
    • http://pagyesa.org/userfiles/file/20210623062014.pdf
    • https://pellevah.com/upload/files/1665387052.pdf
    • http://technoculture.cz/admin/upload/file/dilanofiwi.pdf
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/1baa671afaed61f3b50f7aa41eab238c/63333940773.pdf
    • http://geredekombiservisi.com/userfiles/file/pawasijipepijugifobemi.pdf
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/87g957hte5ccpdsptj27qmd022/66412793373.pdf
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/60ba28159b47a5284384cb54ce5ced7c/94117909112.pdf
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c4deb42f72e---mobevoxodirewur.pdf
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16076b24250e7a---winiviwerebegedujoduxejad.pdf
    • https://newtech-utm.pl/userfiles/file/gejowufugizutitofi.pdf
    • http://accessiblevehicleservices.com/userfiles/file/jotikirikakixodix.pdf
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5d8789679---1160626277.pdf
    • http://adaviestransportltd.com/userfiles/file/62522086350.pdf
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/18f8bfc63cc012c62d700812f225e515/30206781140.pdf
    • https://szaniterplaza.hu/ckfinder/userfiles/files/telopitutuzozejulukowudox.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000102df.bin
3d7cda353c5c0239319ba7e6d313708d6ecc984a0945e1fbb6a958f10831356b
pdf-font-stream PDF embedded font (sfnt) at offset 0x102DF 10704 bytes
font_01_sfnt_off00011b2f.bin
84d4413caef527aa4f7fa742cb5d390d42298f4d9c7d01720b49c18276bf7111
pdf-font-stream PDF embedded font (sfnt) at offset 0x11B2F 17212 bytes
font_02_sfnt_off000147ff.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x147FF 16792 bytes