Malicious PDF — malware analysis report

Static analysis result for SHA-256 a93c6b58933a61cc…

MALICIOUS

PDF

85.0 KB Created: 2021-10-08 06:44:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 1a3432b23d7100ffeffa0fa103a2af0b SHA-1: 3a5cec0e83bdd746f9fa2c3762d7ef9086ffbcea SHA-256: a93c6b58933a61cc0ff84226f2ce761b079704239af901b4d18a4d3c2d721ba6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of a 'download' button lure further supports a phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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.
  • 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://nomylo.ru/uplcv?utm_term=gandalf+some+believe+it+is+only+great+power PDF link annotation
    • http://phongkhamthienhoa.vn/images/files/40880594704.pdfIn PDF document text
    • http://veitali.com/upload/files/25314553236.pdfIn PDF document text
    • http://www.forteks.com.br/admin/ckeditor/ckfinder/userfiles/Images/towadedirufisewovenulo.pdfIn PDF document text
    • http://startmatbaa.com/userfiles/file/pakam.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/3fdaf3401c3b6d36a935e033dab8b142/lazoboripagugafuzerojan.pdfIn PDF document text
    • http://hqshop24.com/userfiles/file/34504586671.pdfIn PDF document text
    • https://eastmangroup.org/ckfinder/userfiles/files/sejumibodakogofokosida.pdfIn PDF document text
    • http://paneldeconsos.com/userfiles/file/41207238598.pdfIn PDF document text
    • http://nuestratierrapremios.com/campannas/file/44599636286.pdfIn PDF document text
    • http://evolutionchonburi.com/userfiles/files/74072689607.pdfIn PDF document text
    • http://cka-shiba.com/ckfinder/userfiles/files/tufoworoniz.pdfIn PDF document text
    • http://classicalgardenstatues.com/uplds/file/82208621615.pdfIn PDF document text
    • http://letnipohar.cz/upload/file/dokuguriwozumowabaxosukan.pdfIn PDF document text
    • http://abnicum.com/files/file/11030476509.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149211a59692---13992127458.pdfIn PDF document text
    • http://nadafashionbelt.com/Uploads/file/76535872066.pdfIn PDF document text
    • https://seerupit.dk/assens/file/kizadomuwukipelo.pdfIn PDF document text
    • https://rajaunited.com/contents/files/fapexaworugupabejupasuf.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/737d94d2dd6c6c91a1d2f9333dd07f41/44938432598.pdfIn PDF document text
    • http://drentmedischadvies.nl/uploads/files/11386137070.pdfIn PDF document text
    • https://komunalno-vrgorac.hr/files/zeregi.pdfIn PDF document text
    • http://brukikostka.pl/uploads/page/file/14273253479.pdfIn PDF document text
    • http://hycxchina.com/filespath/files/20210929121521.pdfIn PDF document text
    • https://rumputhijau.com/contents/files/75436458549.pdfIn PDF document text
    • http://www.vljainandco.com/userfiles/files/mujugil.pdfIn PDF document text
    • http://fd-health.com/upload/ckeditor/files/5665085293.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_off0000e401.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE401 11284 bytes
SHA-256: dc70e53e57756d24aabeea162a75034a2bfacc3826148a7bc51408392b13fc5e
font_01_sfnt_off0000fe2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE2B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001163d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1163D 18788 bytes
SHA-256: 95225969f8a51543059845d414698cb650144c70a00a6875b4523ecd79114408

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