Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1e66e1412d2b3d6…

MALICIOUS

PDF

89.3 KB Created: 2021-08-12 23:24:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4c06ac8ca8a4be8aa251edde19bea2ae SHA-1: f0227d1b7a42023ca59aa8e114c8bcf8548799c6 SHA-256: e1e66e1412d2b3d6a186550429d46336e857bd47df49b6f0698b341ee0dcaba9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous embedded URLs pointing to compromised websites and potentially malicious content. The presence of multiple external URIs and a link farm on disposable hosting indicates an attempt to redirect users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://synerhu.ru/uplcv?utm_term=what+temp+is+needed+for+infusible+ink PDF link annotation
    • https://nikosdimos.gr/userfiles/file/maputa.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160952af2bdcb5---95631932566.pdfIn PDF document text
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16078313c0037f---711002786.pdfIn PDF document text
    • https://washlounge.in/ckfinder/userfiles/files/88831335617.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/cd41qlfudg3f0tnubasqnr6r52/8234908500.pdfIn PDF document text
    • https://egf.tw/test2/images/file/18729620191.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/4a9ca9c93f9ccc01f0b556b46c9d50fd/fawanuxilezudemejag.pdfIn PDF document text
    • http://timebank.ru/sites/default/files/photos/pagefile/wokezabozavirofob.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/62652194f0d0e2651fa6254a8ef1f8d8/62263331380.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/31182304215.pdfIn PDF document text
    • http://camionespanamericana.com/userfiles/file/dixifakapegu.pdfIn PDF document text
    • http://peaceinsrilanka.lk/userfiles/file/15939407900.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/e0fc80a34d3b4fabe605de1c07df44a7/54844588613.pdfIn PDF document text
    • http://ceresasrl.it/userfiles/files/76404609057.pdfIn PDF document text
    • http://www.melloecastro.com/wp-content/plugins/formcraft/file-upload/server/content/files/160871b0aec9f3---miwutavukuzosares.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a87317594e5---35682208272.pdfIn PDF document text
    • http://longarmquiltacademy.net/fckeditor/userfiles/file/40000153873.pdfIn PDF document text
    • https://toskov-yordanov.com/userfiles/file/wuxevilafi.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606d06de75183---guxafudobupix.pdfIn PDF document text
    • http://scamps.biz/userfiles/file/76714008839.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/njatadpuqojpt1b16ed3odikq3/juxun.pdfIn PDF document text
    • http://mp-journal.com/media/file/32850296455.pdfIn PDF document text
    • https://willmarareachamber.com/ckfinder/userfiles/files/dezadefupigutalatovogok.pdfIn PDF document text
    • 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_off0000f6c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010ee0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EE0 11088 bytes
SHA-256: 308aaef3dc7b82d420b1f288da40466f33c77f3195a9eaa31444143562d2981b
font_02_sfnt_off00012845.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12845 16976 bytes
SHA-256: 5e004ba476e34ccb3cbb0e824c9649fb59965f83760581d11f4e6d0e5fe71ae4

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