Malicious PDF — malware analysis report

Static analysis result for SHA-256 df3a3a09b1f8c5f2…

MALICIOUS

PDF

80.0 KB Created: 2021-09-02 15:25:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ea7381d186e84c2a35d4139808872b09 SHA-1: 8b1e4116f8de68064d9aa43ab0695c7e3de7ad0b SHA-256: df3a3a09b1f8c5f2e286437a196b0c101bc2745cd7ab5e51dcf5dc3a2caee170
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 or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The presence of embedded JavaScript (T1059.007) is a common technique in malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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.
  • 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 https://landbondcorten.com/attachment/file/3d071ef3c5c7adc41b4fbdb5e4854f0f.pdf In PDF document text
    • https://globalybm.com/ckfinder/userfiles/files/1628601281.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/61364450965.pdfIn PDF document text
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/d4faad4e5f4de861629ee543a10aaaf0/voxeramajosenedalezo.pdfIn PDF document text
    • http://musclecar-taps.com/js/upload/files/91026188715.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/f684m1j45709rdggf84r5mnc87/86785262149.pdfIn PDF document text
    • http://totoquynhhuong.com/upload/files/xukigivinexelubizalufew.pdfIn PDF document text
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077751de9246---litubegunopago.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/942d042e47dcf7c2814ddc3faf40fd90/wajobusuvidudatew.pdfIn PDF document text
    • http://laptopcuhaiphong.vn/upload/files/notepaneg.pdfIn PDF document text
    • http://studiobonvino.com/userfiles/files/tevetukorit.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/93981d97e9a69303b766b2b7195a560b/piweweg.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/16085374abc8b3---fepezaselari.pdfIn PDF document text
    • http://danchrisjewelry.com/userfiles/file/dopasaw.pdfIn PDF document text
    • http://packamate.com/userfiles/mageworabodanag.pdfIn PDF document text
    • http://acpiindia.com/userfiles/file/84680716592.pdfIn PDF document text
    • http://pixel-pro.ru/upload/file/madizisexakesow.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/16078ce876d656---38497703289.pdfIn PDF document text
    • http://marisqueandopremios.com/campannas/file/giradileranobatujubarilif.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/p2k6hi0pqgb3uumi8v1lbo95ag/wisatoxilosifinaxorez.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/kme3et1hutjnggpgui61fuauda/gebubix.pdfIn PDF document text
    • http://bruisedreedfoundation.org/clients/4/4d/4d9d7eec3bf3a09fa0457ace138f6a4e/File/48735027350.pdfIn PDF document text
    • https://tahitotfalu.hu/ckfinder/userfiles/files/nifusudigixenezogoka.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=the+subtle+art+of+not+giving+af+free+pdf+redditPDF 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_off0000d051.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD051 11048 bytes
SHA-256: 20c5e491936b964f22ef94b7eb957d10817aa010600a1d28b173f11b1d9526d0
font_01_sfnt_off0000e995.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE995 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000101a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101A7 18656 bytes
SHA-256: 4bf0e7e6a385cd2cc195be3d1070f90633c088ad41a5c29d94b6dc62b7dea46b

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