Malicious PDF — malware analysis report

Static analysis result for SHA-256 39ecc84e360d0bed…

MALICIOUS

PDF

75.0 KB Created: 2021-09-01 11:55:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ebcd1f852407b90b4dc5ae505d7ed222 SHA-1: b1a858d2bc944e0b27aa1bf9853e246b42d95e46 SHA-256: 39ecc84e360d0bed25226fddbf83c08beb50bca3e73d10b21a005568ac65c6ce
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting it's designed to redirect users to malicious sites. The embedded URLs, such as 'https://laborke.ru/uplcv?utm_term=best+fruits+to+eat+for+weight+loss', are likely part of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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 https://laborke.ru/uplcv?utm_term=best+fruits+to+eat+for+weight+loss PDF link annotation
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/bf8541e75b14a459ef10b9f097a5315f/11376510481.pdfIn PDF document text
    • http://vonschickenconcord.com/uploads/files/83417165137.pdfIn PDF document text
    • http://demirlermetal.com/resimler/files/38879462427.pdfIn PDF document text
    • http://igorodstore.ru/files/userfiles/files/karefobodi.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c129ce3baee---kexadime.pdfIn PDF document text
    • https://wodepcb.cn/uploadfiles/files/11380636748.pdfIn PDF document text
    • http://e-hematologica.com/users//file/16118445275.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/a99c2f7ee5564708f3f38a6eca2ced47/5419093139.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608fa5fbf3f55---pawuwaneroje.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/c7def8999fc8d10fadd9430e0d7bf6ce/26065785405.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5d5b877f75---laloriwuwadivinit.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad266bae0a0---32916830223.pdfIn PDF document text
    • https://adian.eus/files/galeria/files/sufexoketemisipoxuleb.pdfIn PDF document text
    • https://alquimia.in/admin/fckeditor/editorfile/mixujenokatepeza.pdfIn PDF document text
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/253c3ebda5236d65367341483d6d0d5a/fepudajeki.pdfIn PDF document text
    • https://yunglin.com/uploadpic/files/4942513562.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/7c78e7a8eacfd1afbf6ef61fa21fd2a5/loronajanikigumifata.pdfIn PDF document text
    • http://aldo-ins.com/userfiles/file/ruvurafiwasaxujuxilil.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/483957ccf94732469aca1e44089a6715/59217084997.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082fbf2932f2---1855141524.pdfIn PDF document text
    • http://thanhnhomdinhhinh.net/uploads/files/xivisuwozitope.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/16091fb7aa8091---12860853514.pdfIn PDF document text
    • https://ijpdua.com/contents//files/juvadosimi.pdfIn PDF document text
    • http://gandolfiarchitetti.com/userfiles/files/53379423996.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/69007642742.pdfIn PDF document text
    • http://floridadressyourhome.com/uploaded_files/userfiles/files/90407754580.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_off0000c3e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3E1 16016 bytes
SHA-256: 59760405e1cbc0f4185970dcb466c7fdc7999b7e9173d155d3904272fc0905fe
font_01_sfnt_off0000eced.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECED 10628 bytes
SHA-256: 5dc1b1a362c7f1e51f0592bfcb086195244ae4e74d6db9a9381ec7051969fa3e
font_02_sfnt_off00010583.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10583 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1