Malicious PDF — malware analysis report

Static analysis result for SHA-256 441c004267d1b392…

MALICIOUS

PDF

123.1 KB Created: 2021-06-23 08:07:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3edb8550f55b25f6ebf2170857c5a5ed SHA-1: 49c9ec16ac75541eb5d23a77831390ab1726e342 SHA-256: 441c004267d1b3922e9cd696e74541a5df8f5a602091cd6a8c59bc51f410bed4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links pointing to compromised WordPress sites, suggesting a link farm designed to host or distribute malicious files. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery. Although no scripts were directly extracted, the structure and URL patterns are consistent with a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.tanyadantus.com/wp-content/plugins/super-forms/uploads/php/files/b9c4535b3fe5b267aede20498711ca93/wusagonowatasewifid.pdf
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160751ae4ba1d7---vufezazekubirek.pdf
    • https://an-professional.ru/img/files/file/40154844052.pdf
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b26b75304f0---57145655393.pdf
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1606f316d902f3---kivawiritipebigog.pdf
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16092ab700a3da---99787786718.pdf
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/a6aa80608c9cd85e33720f54a336f2e6/83609653748.pdf
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b54923683eb---gutitomusejavezufogobigul.pdf
    • http://chaodontuonglai.vn/uploads/ck_upload/files/2459067632.pdf
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/3c074358f43910af19a7f73d04974a38/53183648980.pdf
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bd11715f053---gowoloputetowujunaza.pdf
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/f40306a548a4a4c850db0e0244deda04/tojujivotemoz.pdf
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/1608947399384b---90376839911.pdf
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/41md4o6g1cp6hpe54uup9s6phv/32420590141.pdf
    • http://alnoorcity.com/userfiles/file/gewexakud.pdf
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/f9eb5f9aebf265c8efb9d7fc0d07d189/57630335459.pdf
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac8c2a44ffd---31562667736.pdf
    • http://africareview.in/userfiles/file/wepalaladekesujo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=jlpt+n5+particles+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://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f602.bin
5a5f04da21449dc4f1ed125e36f282afaf25dd86613cc092055aa1b7dd44cea8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF602 45660 bytes
font_01_sfnt_off0001822b.bin
7402f3b2f789563d2536ccafcc37071f121a3d8f4d6c2620478bd1bec8a4ba75		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1822B 5260 bytes
font_02_sfnt_off0001941a.bin
51ebeec29509b87aa858d500e37ac8853184703d07d1f913ce36d8e1dc7764c0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1941A 1800 bytes
font_03_sfnt_off00019ca8.bin
408b4742bf8dc83deb35b21eaac8a37151d4f5788b02fdf71382c3bbbd27090f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x19CA8 11272 bytes
font_04_sfnt_off0001c358.bin
ae366017be603f5ab72d9257f3367b5084689b9d22ac02c7aa7f9e025890b65b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1C358 18076 bytes

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