Malicious PDF — malware analysis report

Static analysis result for SHA-256 efd50ec158bfd3bb…

MALICIOUS

PDF

80.8 KB Created: 2021-09-07 17:44:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7f45ed3782b9aeadba4b53c7c7ee372b SHA-1: 6f946fff8cc8bd42c5e4dd9b4ecdc07b77518dce SHA-256: efd50ec158bfd3bbba1dc4065bf42cb85eb8af6dec4b3ac13c8d38318bacc8e1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of links, many pointing to compromised WordPress sites and disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support its malicious nature. The file's structure and the presence of numerous external URIs are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://www.samlab.com.tr/wp-content/plugins/super-forms/uploads/php/files/9t7girevliihc7l7t7pmlfpqjs/jakixaxugugafadipenifo.pdf In PDF document text
    • https://spa-salon.ru/ckfinder/userfiles/files/fonakoxofejoka.pdfIn PDF document text
    • https://rmp-traueranzeigen.de/cms/files/konuxakalulevojages.pdfIn PDF document text
    • https://dubaimotorcycletours.com/uploaded_images/files/65630544226.pdfIn PDF document text
    • http://xn--80aaae7amexjfdlfdfg.xn--p1ai/files/file/fizigu.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/a8183dca5e9613ce5a08e871f4b279f0/99461789223.pdfIn PDF document text
    • http://hotelborgodeipoeti.com/userfiles/files/doponopopol.pdfIn PDF document text
    • http://jerseybankruptcylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kimugugikefo.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a62a089ffb6---24963190714.pdfIn PDF document text
    • http://www.heksan.com.pl/file/17878369637.pdfIn PDF document text
    • http://www.onlinetemsilci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082557b882ca---pokuruz.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/6694d9afc5cf84c7f97d466bf192e3a3/39952256230.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609677bc718e7---zugogajit.pdfIn PDF document text
    • http://gostinica-domodedovo.ru/files/23490707309.pdfIn PDF document text
    • http://thaimassageboy.com/ckfinder/userfiles/files/992794735.pdfIn PDF document text
    • http://quickvideo.nl/userfiles/file/fekifugiroruvagu.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160efeb423693a---folokubixetot.pdfIn PDF document text
    • https://www.erenang.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085f273321e6---walulomokomefotuto.pdfIn PDF document text
    • https://areicon.com/images/file/venapobam.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16082ed7f9aa63---werokoperosakelibobiga.pdfIn PDF document text
    • http://bafiti.com/sklep/userfiles/file/vebiwuxedep.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/d50856aa18cb9ad6f26d62d15e501bc6/82559044962.pdfIn PDF document text
    • https://westhigienia.hu/editor_up/nozepen.pdfIn PDF document text
    • https://ngusacdon.com/upload/files/wizenusulanixowam.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=habilidades+interpessoais+pdfPDF 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_off0000db20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB20 10624 bytes
SHA-256: dced666fceb9311a39d918ffc58210273d781f660eac6c32394ea33fffd5d8b0
font_01_sfnt_off0000f33d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF33D 16900 bytes
SHA-256: ac539f2c5a1a24f698113786b1253999cd2f79c7fb6a3562bbd6e21240bd25c6
font_02_sfnt_off00011d9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D9A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1