Malicious PDF — malware analysis report

Static analysis result for SHA-256 937d50391086f231…

MALICIOUS

PDF

66.2 KB Created: 2021-06-21 05:34:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 307f0585e50ba9af43d03dd8c2c146f1 SHA-1: ffef55143dbd24a8d9571429371587e33b143439 SHA-256: 937d50391086f2317cf13463c44f33590dc72a33681d37e957c973e2fcd237d0
156 Risk Score

Malware Insights

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

This PDF was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains numerous embedded URLs pointing to compromised websites and link farms, suggesting it's designed to redirect users to malicious content or phishing sites. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's part of a phishing campaign or malware distribution effort.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/628ce2efc013f579a30a16e6610968a8/tenizufifolawexigopodo.pdf In PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/c58bfb3276a2dcf9009cf5224f203049/18786290783.pdfIn PDF document text
    • https://amerismithenterprises.com/wp-content/plugins/super-forms/uploads/php/files/33f79facee6ee86598499f2870df0bae/mimejorisisob.pdfIn PDF document text
    • http://kudusde.org/resimler/files/roxupulometifugakivu.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a61f4ce760---94955322742.pdfIn PDF document text
    • http://allaboutdowney.com/userimages/xewadanuvadabak.pdfIn PDF document text
    • http://studionegro.net/userfiles/files/93323576481.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16071ecf9c5dbf---44560461085.pdfIn PDF document text
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160738a68616c3---gobanugixenimisige.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/81692495969.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160984cc193f34---28137828139.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/c0f5d99c7f25bdecead1168ce27188cc/35090295421.pdfIn PDF document text
    • http://baaningdoi.com/file_media/file_image/file/38898731225.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607573a537a01---3922547502.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607a525d469e6---xafofenukuxugepomomikewu.pdfIn PDF document text
    • http://bronia.org/userfiles/file/62178029015.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160946128f33df---jokedogifedavu.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096573c28cff---56161038025.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=hrm+vsp+rao+pdfPDF link annotation
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/c6ed9baf36cb14bd88b676043196b5f4/ruredox.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c4c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4C3 5176 bytes
SHA-256: a221ba526e668e15e8d0fe60d3a59a1bdad5b56fd079d8b41fd836ae7e39e706
font_01_sfnt_off0000d64d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD64D 10568 bytes
SHA-256: 63946fc7b429c928a69c351b6f98b0ecb7d56e79d693b76a1a46b44fb7c301cb