Malicious PDF — malware analysis report

Static analysis result for SHA-256 79fbf8732e2d6866…

MALICIOUS

PDF

102.2 KB Created: 2021-07-03 22:21:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 69d87fc9b6e02e6ad28b0b02aeb6b4e6 SHA-1: 8d756a7ed0f3c3459a81ef84c70e7a6fe333504e SHA-256: 79fbf8732e2d6866517df045cdfc747c531fa70fa143db106fd21b81acf411fd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised WordPress upload directories, suggesting a link farm designed to redirect users. ClamAV and ML classifiers identified this PDF as malicious, specifically flagging it as a phishing trojan. The presence of multiple distinct hosts and a high number of links indicates a deliberate effort to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077fa548cd55---10212249755.pdf In PDF document text
    • http://thesetnews.com/images/fckeditor/file/xozudugimepulepufejom.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a28a4ab8567---96272460148.pdfIn PDF document text
    • http://toptoptraining.ru/img/upload/file/30455335106.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095b2202144a---vufefujetadolako.pdfIn PDF document text
    • https://vandolderskb.com/images/usr/32975364951.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16072881e18ee5---67173860434.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a1074d83c65---3309441518.pdfIn PDF document text
    • http://billedbutikken.dk/articlefiles/file/26832620632.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/87aafb71f5d29298cc1c72484db7799e/91866681881.pdfIn PDF document text
    • https://alutat.com/data/file/tomaguwapugijobi.pdfIn PDF document text
    • https://residenciasanamaro.es/userfiles/files/kibowejafo.pdfIn PDF document text
    • http://czdashan.cn/uploadfile/file/2021042922242873499.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a8e0db9d3f7---86838927701.pdfIn PDF document text
    • http://hk-dcc.com/wp-content/plugins/super-forms/uploads/php/files/vtps3m996a8kn6r26okcjavgj5/towasa.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/2c94324886f3a0e01bb4880504ea47a1/75046030539.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/4d946a6269fe235f82c1b91430b1aada/89655434388.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/c8c00e77dd0bc0822c324a93fa1991db/11171489216.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606c99a64eff7---mirazivakokijudibaguje.pdfIn PDF document text
    • http://1982thsreunion.com/clients/a/a8/a85c6617a93da1462bf6c3e7dda9c043/File/49259343890.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609a14420c431---19359908589.pdfIn PDF document text
    • http://www.abcklima.hu//data/editorfile/43186207243.pdfIn PDF document text
    • https://aneri12.eu/res/file/30481204814.pdfIn PDF document text
    • https://farmacieitaliane.com/documenti/file/39277253718.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088e516cebdb---98486106831.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=relation+between+wavelength+and+powerPDF 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_off00012310.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12310 20104 bytes
SHA-256: 01bc6498e7e3d5f8d51b344cbdba6ecf23af7b21cf69a53579fd75bf02446a55
font_01_sfnt_off000158f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x158F3 10840 bytes
SHA-256: 570e55f06887ee6eca60074871bb6e0214f6414065205947ecc9a7f179c14f8c
font_02_sfnt_off0001717e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1717E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1