Malicious PDF — malware analysis report

Static analysis result for SHA-256 8326be036ff73905…

MALICIOUS

PDF

81.6 KB Created: 2021-07-04 19:18:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: ffeef781c4264507b332476851847b66 SHA-1: fb03a66dacaecbf634c7be26651fcbe04999cc94 SHA-256: 8326be036ff73905e5e43570f8178a540469f82a97b6640dfbef55542d932e75
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites, a common tactic for distributing malware or phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the presence of numerous external links suggests a phishing or SEO-based attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160736a6c31ff0---39417626183.pdf In PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/810c6cc59be1089c59949fc88e0b81ea/ropalijubexu.pdfIn PDF document text
    • https://dienlanhhonganh.com/images/pic/file/11000006770.pdfIn PDF document text
    • https://aarhuskortet.dk/images/file/38142700245.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1609c41f5d717d---22523059125.pdfIn PDF document text
    • https://art-eria.pl/mandarynka/pliki/files/13571954177.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607bea6833977---23075277081.pdfIn PDF document text
    • http://chrislahoda.ca/userfiles/file/tewage.pdfIn PDF document text
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/307c803f300b750e4d216ee86526cf37/lukafipakap.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/1607416d8d9cee---suzilatirijajeluveg.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/74560763990.pdfIn PDF document text
    • http://www.hermosabeachbungalows.com/userfiles/files/89850872911.pdfIn PDF document text
    • http://vanxuantravel.com/upload/files/wamilewibuz.pdfIn PDF document text
    • https://pestresolution.pt/site/upload/file/58667734585.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/l8a7n7jamajgfpp3504hu875e3/32885081986.pdfIn PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/d15417b60f877eb2b152477207301c08/lunesatibutanifidipeda.pdfIn PDF document text
    • http://texmet.pl/userimages/file/58050034066.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a4e9991d2e---pikenawij.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a1115b2d371---nepesimit.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/pivapixigusob.pdfIn PDF document text
    • http://boxethai38.comupload/file/67093262850.pdfIn PDF document text
    • https://gawwaclsc.com/app/webroot/upload/files/bevuzekipajuj.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/kav895h4755dajb5g4ovn4ej02/rolidepasonorejapizibos.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/08ad063469a435fe561fed619b0f5533/77845513615.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=amputation+of+foot+and+anklePDF 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_off0000dcc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCC5 16916 bytes
SHA-256: 98b92b776fd572908ab35d7e5c6f226691406f46bfb74e4f8aab2c493c14f9c6
font_01_sfnt_off000108fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012114.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12114 10564 bytes
SHA-256: 5fa5385d667164ad4558dc775973c7809b71b05ffe37d8486b176f1f957dd94b