Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc6e6b5a2d31a210…

MALICIOUS

PDF

87.8 KB Created: 2021-08-22 01:12:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 5daad9fa8c1a804a6e920467808837db SHA-1: a2b200448278353b9e2265f720383c32e17ef34f SHA-256: dc6e6b5a2d31a210d2d4216dc55f3da546648352d07bcf52fe8f58e40c568d7e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF was flagged by multiple heuristics as malicious, including a high ML score and ClamAV detection. It contains a link farm pointing to various domains, some of which are hosted on compromised CMS uploads or disposable hosting. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to lure users to external sites, likely for phishing or malware distribution. The presence of 'utm_term' parameters in some URLs indicates a potential SEO-based lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://konditsionery-reutov.ru/upload_picture/file/72856649969.pdf In PDF document text
    • http://drstevealbrecht.com/wp-content/plugins/super-forms/uploads/php/files/2b70ea01c0225f5be5390359d177e1bc/raxitotoxexatipisoxifudo.pdfIn PDF document text
    • https://smartbrand.ro/mm/file/40637187731.pdfIn PDF document text
    • http://bawaconstructions.com/editorData/file/6723706846.pdfIn PDF document text
    • https://binarbaidservices.com/public_html/userfiles/file/76898019018.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7a74cd0d2b---dulipowetukijeluze.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607559d016ac8---lomadeze.pdfIn PDF document text
    • http://drapa-technika.cz/UserFiles/File/pibadajovubowigixezun.pdfIn PDF document text
    • https://equator-maritime.com/userfiles/file/lupizilipolupalekoke.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/0ji9gglil4mkka4sbh5q8puqcr/46373382137.pdfIn PDF document text
    • http://bloomx.com/sites/all/sites/bloomx.com/files/jaxamopafulitufirifopidat.pdfIn PDF document text
    • http://hum-lucknow.org/test/fckeditor/file/navatapumewurerotigilap.pdfIn PDF document text
    • https://bselink.com/userfiles/file/88512388516.pdfIn PDF document text
    • https://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/57ef074889b0732fc2e5b2d9c80638e8/seluwisetedobifimakizuk.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16105fd74c8527---67110018506.pdfIn PDF document text
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d89facceea---xirapiwopuwarozuloxivo.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d50082c145b---59996971191.pdfIn PDF document text
    • https://afayl.com/userfiles/file/fobulesufogizigexasiso.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/85261790e33ba12416752f5bc81e0755/26440495951.pdfIn PDF document text
    • https://rrr71.ru/upload_picture/37064218178.pdfIn PDF document text
    • http://travellightnepal.com/userfiles/file/67751989593.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3dc9212c2---wevinu.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/70986266516.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/78204478351.pdfIn PDF document text
    • https://aedwea.com/upload/foto/26126691115.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b754626664ed3ee6d95adafd5777b3d8/90227726712.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/99gsvh0adsh8o68fukmf35ubs6/24874082935.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=whatsapp+status+video+gifPDF 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_off0000eade.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEADE 10688 bytes
SHA-256: d28c2a7b648996a19a2457b20dd4cbdedad7333cef3e80878047c070431f6378
font_01_sfnt_off0001035d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1035D 21696 bytes
SHA-256: 05b304c0a8cfb0b3844afa71ef9425b21595d362eedcac758fedb2735a4d1525
font_02_sfnt_off000138f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1