Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb4b8472b4623a01…

MALICIOUS

PDF

88.7 KB Created: 2021-07-25 19:57:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 6ee4c1547546fd3061573d2ca99f3524 SHA-1: c960939072b5784aaad20cd6497c3ef0e523eee2 SHA-256: eb4b8472b4623a011a86a7588d55c934e79273cbae9e1998018039c38af424c2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, hosting numerous PDF files on compromised WordPress sites, likely for SEO manipulation or to distribute further malicious content. The embedded URLs point to various compromised domains, suggesting a broad distribution network.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/e97e1b68033b8ae9e531f84e27544119/50946287290.pdf In PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/201f1796ad22b84294b1bcf081437237/94281609297.pdfIn PDF document text
    • https://marblobaths.ph/app/webroot/img/files/66403737072.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16097c7584b988---46803808631.pdfIn PDF document text
    • https://bauarch.bg/files/52193472968.pdfIn PDF document text
    • http://uniquehotelsolutions.com/files/others/71747469560.pdfIn PDF document text
    • http://ijdssymposium.eu/upload/48198668058.pdfIn PDF document text
    • http://starkhigh1972.com/clients/d/dd/dd83d6d7846a033806cdb512e10d7d7c/File/96337145881.pdfIn PDF document text
    • https://swagath.co/new/ckfinder/userfiles/files/zukaxapunepalufe.pdfIn PDF document text
    • https://miguktour.com/FileData/ckfinder/files/20210625_6561F567097050D7.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/165e8be76aa4a14fe88dbd039ed1c831/sefagivokapezasaj.pdfIn PDF document text
    • http://cnhhgj.com/upfiles/userfiles/file/15069844691.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/1iau0qjl3osdc3to6hbqpddc1c/buwibetonumawe.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/83adl00pkrkh2hfjrgb0f1jsv4/24010829519.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609c3d9c1fb98---44276447289.pdfIn PDF document text
    • http://homenet-spb.ru/userfiles/file/ragojamezewevusirupito.pdfIn PDF document text
    • http://adria-ex.com/images/blog//file/gosebujesesas.pdfIn PDF document text
    • https://fallsplat.se/file/76494231671.pdfIn PDF document text
    • https://radmangroup-ye.com/rgfiles/file/guxekitesupo.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fbef6f183aa---23626016819.pdfIn PDF document text
    • http://newgrids.com/userfiles/file/manilorineselirurikujux.pdfIn PDF document text
    • http://deshdunya.com/blogimage/file/18416061360.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160ee0c7902c88---34023446426.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=how+to+use+universal+ac+remote+chunghopPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ddd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDD5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f5e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E7 18028 bytes
SHA-256: 2683bd14aa09e7e8e261c93e3b09fb2643d5cb297eace2523e5ba909d98a7eb5
font_02_sfnt_off0001256c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1256C 5600 bytes
SHA-256: cef8f434b8fa6b49b63278ea96d307c04d026d224568e2a4bc6224869acc7535
font_03_sfnt_off00013a4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A4E 11064 bytes
SHA-256: 6312d8602367cf2f13706420d5f772767929c8c2784d27fc80520c49b3bf34b4

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