Malicious PDF — malware analysis report

Static analysis result for SHA-256 d94d2b12afd277d1…

MALICIOUS

PDF

81.5 KB Created: 2021-06-18 09:44:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 890039a9bab66332631abbba014aa095 SHA-1: c8da7c63624ce99af73df9c33ae713c26c407ec1 SHA-256: d94d2b12afd277d1cd61582228fc3a4cf8c1464404182c11127eb906c6585d36
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF document is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, directing users to various compromised WordPress sites and disposable hosting domains, likely to download further malicious content. The document body, though heavily obfuscated, contains references to 'sword art online manga download pdf' and wkhtmltopdf, suggesting a lure for users searching for such content.

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 http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160847091a86c6---vowobamekaretagegup.pdf In PDF document text
    • https://zegabilisim.com/calisma2/files/uploads/nenunamabozupi.pdfIn PDF document text
    • https://paperland.bg/uploads/file/64853609123.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/fc647551f77f062fcfb00bb3684aa8c4/49283459190.pdfIn PDF document text
    • http://uleshuzatshop.hu/files/file/fatafasisuzimaton.pdfIn PDF document text
    • http://golfproradost.cz/webpagebuilder/ckfinder/userfiles/files/56594839218.pdfIn PDF document text
    • http://caratow.nl/userfiles/file/35822196481.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/927bfb5dd2e125c62a6563d3508502cd/getixiwugoxitisonobakax.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/402d5bd47fc815d495a8f41dcc586b16/xukovopalabofagowo.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1607046b656a78---pedabawobitujubigogo.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1608060ba6a480---55935866889.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/06d25ec073ca5678b081b1b46144adbe/74735946412.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6cc9716b4f---58601906649.pdfIn PDF document text
    • https://circolodelpistone.ch/userfiles/file/nipofasaboratinupeninad.pdfIn PDF document text
    • http://bigsvatcharasith.com/userfiles/file/60712599039.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/fobubifezefulotot.pdfIn PDF document text
    • http://chandigarhdatarecovery.com/files/file/96134688180.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/6i9fa0tt31lauhlr7t61prmcd3/65956959112.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/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=sword+art+online+manga+download+pdfPDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fcde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCDE 5376 bytes
SHA-256: 27bb9f94830ecd5d2f82ba59d0b1417c03c95760ad2eb33838001eb3be55e0ec
font_01_sfnt_off00010f25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F25 12004 bytes
SHA-256: 0554e5d13e85b2574326f786f189f70dbe263dae40c17640bf01189c96e33e0b