Malicious PDF — malware analysis report

Static analysis result for SHA-256 2355fa1e432f1225…

MALICIOUS

PDF

80.6 KB Created: 2021-09-09 14:38:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5eb802d008fe36179647178df6ba96e0 SHA-1: 832013d3ad6f96cd5de849e92f04f56089b5fb3a SHA-256: 2355fa1e432f1225d3c01bc64c9aadb275a9d90bf5f08d866fdbb540654663dc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm pointing to numerous compromised WordPress upload directories and disposable hosting, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious sites or download further payloads. No scripts were extracted, but the structure and URL patterns are indicative of a phishing campaign.

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://villadelauca.com/userfiles/file/fojokutozodolulirorinobeg.pdf In PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/16131d76444bd2---38440358984.pdfIn PDF document text
    • http://yevres.fr/ckfinder/userfiles/files/dajefutofadumesal.pdfIn PDF document text
    • http://stlnsk.ru/uploads/file/36199266908.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/70c4f6acc93d8381d0045669ba755ad7/wibagofojijujuroxa.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613447a7ca02b---39871378507.pdfIn PDF document text
    • http://meadescafe.com/userfiles/file/21675821762.pdfIn PDF document text
    • https://mytopics.it/uploads/file/buzinoxumos.pdfIn PDF document text
    • http://www.mbk-montage.nl/ckfinder/userfiles/files/nomubuv.pdfIn PDF document text
    • https://rkdestate.com/userfiles/file/6250526923.pdfIn PDF document text
    • https://firsatpin.com/calisma2/files/uploads/romaxolepinubi.pdfIn PDF document text
    • http://grandfiltr.com/files/file/kamikerularekifojiba.pdfIn PDF document text
    • https://spheresignal.com/app/webroot/userfiles/files/ririzaxobekolota.pdfIn PDF document text
    • http://www.serge-valentin.net/ckfinder/userfiles/files/xogule.pdfIn PDF document text
    • https://sma-dfgg.org/site/admin/file/69060076781.pdfIn PDF document text
    • http://88cpap.com/userfiles/files/92437749717.pdfIn PDF document text
    • http://888spirits.com/userfiles/file/3963281720.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613739c721926---89926981944.pdfIn PDF document text
    • http://www.tm-africa.com/beta/public/uploads/cms_filescms_files/85504696119.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/161353210afaf4---14487376271.pdfIn PDF document text
    • http://kibbkw.com/uploads/files/9276427430.pdfIn PDF document text
    • http://perles-del-beya.com/userfiles/file/10354479282.pdfIn PDF document text
    • http://clainvest.pl/userfiles/file/zeduni.pdfIn PDF document text
    • http://c2ctrading.org/cms_upload/files/1457555121.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=ds+games+isoPDF link annotation
    • 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_off0000d977.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD977 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f189.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF189 17384 bytes
SHA-256: c985c39c1627cf0b5b2865f87461bcb826fafe94536796e0a6d2b77735845aa9
font_02_sfnt_off00011df7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DF7 10104 bytes
SHA-256: b17af7bfe6e2d660fe431a3cd2c0338a671ca4809792baa52f646c1485b4579b

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