Malicious PDF — malware analysis report

Static analysis result for SHA-256 0826cf6231ac0567…

MALICIOUS

PDF

125.6 KB Created: 2021-07-04 04:29:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: ff5b0adea3b2ff9e6bbf7d06a177d9ca SHA-1: 5033fed564807027cbf2064cb4533cc69762df79 SHA-256: 0826cf6231ac05671c34946de436689e48046f970e7b4b498611d2dfb90bb0e6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF document that exhibits characteristics of a link farm, with numerous URLs pointing to compromised WordPress sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or redirection to malware. Although no scripts were directly extracted, the PDF structure and embedded URLs suggest an attempt to lure users to external malicious resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9901

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://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/51181135a02e04206cae710f95bbd561/jizupipepoxupejelo.pdf In PDF document text
    • http://mulroyenvironmental.ie/userfiles/file/jubolagokirokaloj.pdfIn PDF document text
    • https://marbellamohali.com/wp-content/plugins/super-forms/uploads/php/files/f66bfe2255cfca6b9da000cdd89f7179/kigimunasisigowobafir.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f44c52c4b9---vijadowel.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dab309e604d---nuxemixelo.pdfIn PDF document text
    • http://ubestsports.com/imager/files/20210606101147.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c7b5142c3f6---91559797436.pdfIn PDF document text
    • http://jun-travel.com/userfiles/file/zegelepipaje.pdfIn PDF document text
    • http://mynigaoe.com/upload/file/20210617054653.pdfIn PDF document text
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/jpbtfpg5lncdu4pirqvcp7b0h5/46229291479.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa556ad0c4---43950517120.pdfIn PDF document text
    • https://puntoagricoltura.it/file/kovewapilixufufizeguj.pdfIn PDF document text
    • https://boucherienabli.com/uploads/FCK_files/file/redodizapuke.pdfIn PDF document text
    • http://bonapartefamilynetwork.com/clients/7/7d/7d081654635712149502d88e72c54c2d/File/wabomiforusur.pdfIn PDF document text
    • http://otvorene-srdce.sk/userfiles/file/xupifabepuwikikejenogav.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/3nvj6dpisdp5rqvr1patj0v94s/mevoluf.pdfIn PDF document text
    • http://businessplan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/bikoxotum.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2439bc863f---vuvaxazag.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160853229b8146---64423678093.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/071a53d653bd4edeeb7d27369859d2a7/44545947244.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/88334b4e7aaf34e4b3d92e1ad0e489e4/saxegilenov.pdfIn PDF document text
    • https://acryl-bg.com/userfiles/file/gefipalekozo.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606da8a2a1fce---xubafig.pdfIn PDF document text
    • https://cremyco.com/app/webroot/docs/file/polajawetixugalodurizugi.pdfIn PDF document text
    • http://skrabl.pl/www/rpbd/fck/file/88490085847.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=become+meaning+in+marathiPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00016109.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16109 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001791b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1791B 23096 bytes
SHA-256: 3e9aea5b826a9c7abd86adafbc2fadad848304687bd620ce9376233e749304cb
font_02_sfnt_off0001b339.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B339 10516 bytes
SHA-256: 01cfd0b830e9858d7c62a20d09d79b35f9f2ccab6763b9099e8fd4bd7206f55a
font_03_sfnt_off0001caf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CAF5 18428 bytes
SHA-256: af8445751640ffaaedae6ee591dcd2931557007e40469b9e1c3300258d350f2f

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