Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9f01148d9339ddf…

MALICIOUS

PDF

84.7 KB Created: 2021-06-26 22:59:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 5475c475f70ebe4ea785bdba2f479d0d SHA-1: 5dd2eebbac304a71a5cdef67a09e2ee61f5c7a0b SHA-256: d9f01148d9339ddf86f2e213716270dd6d966d4db73f99ccf79bc45e461d7207
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites, likely serving as a distribution point for phishing or malware. The presence of external URIs and link farms on disposable hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://catamma.ru/uplcv?utm_term=laxmikant+chapter+wise+mcq+pdf PDF link annotation
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfb78008e99---wufovofukepi.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160871eddc136e---lolukaweb.pdfIn PDF document text
    • https://thehideawayresortpattaya.com/userfiles/files/7366225312.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a93a826a2b0---16919680663.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160bf7f553c7c3---80161877381.pdfIn PDF document text
    • http://www.asslar.de/downloads/41175067534.pdfIn PDF document text
    • http://payassistinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070956a9c576---72107983711.pdfIn PDF document text
    • http://www.hgbehringer.de/img/files/files/betejopuvu.pdfIn PDF document text
    • http://0-50.ru/userfiles/file/23512557263.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607a385484f96---zovadezowijoli.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c54c1f2eb56---74136803341.pdfIn PDF document text
    • https://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/edfb2f933ec61b301c4f5268e6e8e4cd/87233142329.pdfIn PDF document text
    • https://toskov-yordanov.com/userfiles/file/24653374807.pdfIn PDF document text
    • https://aterhesseg.com/up_image/file/rufopodivugonoter.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/94126fb685562c6232ecbb99d8881d8a/63078407382.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/p4k2h4tvbrk3q9j6rt94iklj6v/45893900979.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/91rgnqmfsi2onvia8e9ghh9hm6/sitagozugax.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/778149991daf4d8439bc8f53340ab238/75929412350.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/iskc8l6huue1r1q3e86aq9dd74/53650915805.pdfIn PDF document text
    • http://yournamebadges.com/withyourdog/cms_uploads/file/vovuzagekaxixigad.pdfIn PDF document text
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/b48f34433ead3b74ac96c0ae87b24613/bolewuv.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/6ce3bd2703f0d4a0e8c81c4f6603117e/36863708923.pdfIn PDF document text
    • http://fkhd.cz/data/img/53333802345.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca8b1d989a---pitixirenesawi.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/gjo1bv1i5b0ql0c4uutaqcmhql/roliduwagebisozubaxodin.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_off0000e416.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE416 17640 bytes
SHA-256: e63d00a4cf0e469b8c2b70748845be2b2eec578017d319267bc920c4ad404497
font_01_sfnt_off00011279.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11279 11104 bytes
SHA-256: 3bec52e40eb9eaa548f5206f9245629f35db86cf1fdce4dc130b1b9c72945985
font_02_sfnt_off00012c03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C03 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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