Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c3f3ed0b73e79df…

MALICIOUS

PDF

85.7 KB Created: 2021-09-01 01:31:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b262600206b534860de869e4874ab997 SHA-1: e73ab0b1a5d4e26066f6548231f87150bbfc7ffc SHA-256: 5c3f3ed0b73e79df034858acc2a2c52eb3b94ac4a1362348585d6d878e8ded80
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely used to facilitate redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://ballard1966.com/clients/22636/File/75213717892.pdf In PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3c152040a4---20958619321.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086759b6b1ee---kowefekojipabij.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/sebff4gagbdqcv5k15djcfbk41/vazugumameduxafexikifobof.pdfIn PDF document text
    • http://purofirstli.com/userfiles/files/gumaninib.pdfIn PDF document text
    • https://actaviaserica.org/board/file/files/71004735102.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611cd19cbe42a---xepusozuzidelovu.pdfIn PDF document text
    • https://acornschoolcharleston.org/wp-content/plugins/super-forms/uploads/php/files/a4781c1241b5b1889fa264bfb93b49cf/fizuroxiwiroxa.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160a959e43f314---wojuvomedaru.pdfIn PDF document text
    • https://getracemirates.com/userfiles/files/febapawojegawalexafisepi.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/07fb27a0c78bf343156b5f018f8199c8/95943068068.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/91dcbj7281pm1o4ij5om6gc8ht/48884043759.pdfIn PDF document text
    • http://familiehollander.nl/images/uploadedimages/file/xudusexiko.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/cac4fd6317c7a7c325072ff837cfd32a/lewozedesevugesus.pdfIn PDF document text
    • http://taiwanquinoafamily.com/shopadmin/upload/files/binufevutexezufixu.pdfIn PDF document text
    • https://lesfeesdelhetre.fr/upload/files/jarugivomamutopoles.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-7-22/20210722070502482631.pdfIn PDF document text
    • http://9jamail.com/FCKeditor/editor/filemanager/connectors/userfiles/file/67243785501.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7cc088e868---85969566212.pdfIn PDF document text
    • http://48bulls.com/js/upload/files/2270595763.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/u9iqqf8sjmv557cbu3dulf7cf7/56918464005.pdfIn PDF document text
    • http://zamokugrofa.sk/admin/fckeditor/file/84784469649.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/1611141ed14728---luxamalizami.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=physical+science+worksheetPDF 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_off0000ea49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA49 17980 bytes
SHA-256: bf89d26806faaf873bbc69ea593365154b26d34fd9f231d48d65c78066d65699
font_01_sfnt_off000118de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118DE 10620 bytes
SHA-256: fd96a8a6b3f391bd3deea87dfaad6a7c818ff8425c7bd53c4b80980b2aeacaf5
font_02_sfnt_off00013137.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13137 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1