Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ae55ddec35c8ff7…

MALICIOUS

PDF

83.5 KB Created: 2021-09-05 22:24:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 0e6daa42d7075ec57a460f4309e4833e SHA-1: 10d4f236f184172d220de4609be644322c401403 SHA-256: 4ae55ddec35c8ff7dbae439c3c0b4bc1a5a82dd7af77e60c0fa48dc48b2b4b96
156 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 contains numerous embedded URLs pointing to various domains, many of which appear to be part of a link farm hosted on disposable or compromised hosting. The primary function seems to be redirecting users to potentially malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

Heuristics 6

  • 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.
  • 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://retta-bg.com/userfiles/86727205527.pdf In PDF document text
    • http://gaziogluenerji.com/images_upload/files/85445377666.pdfIn PDF document text
    • https://heyratacademy.ir/file/29242919021.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/ah0a2u3k76apfc5kuckibgm27l/78268048341.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/a241d953c5e753777e67b985a3e0e6be/41308031364.pdfIn PDF document text
    • http://bet-balance.com/userfiles/file/gelirelarudujagojar.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/6b59q5i4higea3qbtkq61io0lb/83717304529.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c7a020c99b---lejulorepa.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/88863108620.pdfIn PDF document text
    • https://szekszardportal.hu/userfiles/file/mogufem.pdfIn PDF document text
    • https://butchercurnow.com/img/shop//contents/xezazekikovugameb.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/tajatugime.pdfIn PDF document text
    • https://okazdedziecko.pl/_files/Media/file/zorodokos.pdfIn PDF document text
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/2e130b3a0d8076af6ab967477648835e/xuwosoxem.pdfIn PDF document text
    • http://rafaelokazakov.com/file/kerufezesesalosifoso.pdfIn PDF document text
    • https://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/25eepgqjj5t7br7m1dkv2tqr85/witojivazirowizuseke.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/00676ce9c8e6a411883f5cbb21c0fc3f/nikexana.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607a0fea2d26d---memesa.pdfIn PDF document text
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/3bbab014de05eee4a28fcb2d2c2e6129/gupopenakoluzovod.pdfIn PDF document text
    • https://study4student.com/cache/fck_files/file/11222965496.pdfIn PDF document text
    • http://dentherapia.hu/files/file/62657438334.pdfIn PDF document text
    • http://needychild.org/ckfinder/userfiles/files/sabudobogajamojofimuveko.pdfIn PDF document text
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/mp81ip45s3kl11tntjb2gb5ij0/72667700230.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb97237fb6f---winaxumikotefej.pdfIn PDF document text
    • http://pnc21.com/files/fckeditor/file/307808840612901b1495ac.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/lozur.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=verb+form+list+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_off0000e16a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE16A 10500 bytes
SHA-256: 4fb2f32b2f3c77817d58b922992d0c7b0ac1817961674f7a951033219be09337
font_01_sfnt_off0000f912.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF912 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011124.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11124 18456 bytes
SHA-256: 68f0deaeed1a7f6ec34dab9b212935dbb84fb918b938ca6616ddd1ffd4411228

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