Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbced1a223ac9412…

MALICIOUS

PDF

70.2 KB Created: 2021-09-04 03:56:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a013af56b89bb9ccfa4f9b615b3c0456 SHA-1: c994c8593ac78af4c042e481d1478db5a616678d SHA-256: fbced1a223ac941227567330a459636c48dc65a97e73b429f764d7df804ee62c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of a ClamAV detection for 'Pdf.Phishing.Trojan' and ML classification further supports malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://infrive.ru/uplcv?utm_term=ppt+to+pdf+converter+online+free+fast+without+email PDF link annotation
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160b01f66c971b---63351340806.pdfIn PDF document text
    • http://mebel-moscow.com/content/xuploadimages/file/pebef.pdfIn PDF document text
    • http://usdcp.jp/user_data/userfiles/files/tebigagawizigipi.pdfIn PDF document text
    • http://harasim.cz/uploaded/files/dopetuwazafizibimodij.pdfIn PDF document text
    • http://diamondsnspurs.com/clients/12200/File/jiwusadekejedovimuf.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/1mpf376h3m2gmls5a0can48svs/rukixiz.pdfIn PDF document text
    • http://robertfeinberglaw.com/images/edit_images/file/vafusuforageru.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/ec50fb3e975aa9a46b75502fb596d491/9040273673.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc84eefc61---waworon.pdfIn PDF document text
    • https://feng-shuiworld.com/userfiles/file/sekexiponivogetoro.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/17e9b7404103bd1ead11f841d4f2cb84/vitivuninoviwor.pdfIn PDF document text
    • https://efnnma.org/files/file/nulikopipafudavusa.pdfIn PDF document text
    • http://bellina.pl/userfiles/file/27896881608.pdfIn PDF document text
    • http://infinity-pro.ru/userfiles/file/35238119916.pdfIn PDF document text
    • https://alarouba.com/ckfinder/userfiles/files/nopeluwobavovudom.pdfIn PDF document text
    • http://tipiland.net/upload/file/vufiruzuvuxavupegemi.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607f14ec439ac---53670537292.pdfIn PDF document text
    • http://decamiones.com/userfiles/file/38248239133.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/e7bc65ec0eda7cc9ee0dd6309dacef09/tenoxawi.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1610e602dadd6d---99097263527.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fad90905a3---luwizuwadazoxa.pdfIn PDF document text
    • http://antonioruizabogados.es/userfiles/file/22847672917.pdfIn PDF document text
    • http://merlegdoktor.hu/tmp/zafujigituvurawawodot.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_off0000b1b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1B1 15520 bytes
SHA-256: b98bbff9d816a922377149235c8199fa3b05693c76a53f2a3e2fabeac099eaa4
font_01_sfnt_off0000d92f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD92F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f146.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF146 11136 bytes
SHA-256: f41ab7f633d9890fed37363c9e1086e282ed2c26561e65de14960c6f445a9697

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