Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e4a2459a87e42bf…

MALICIOUS

PDF

65.9 KB Created: 2021-06-18 20:33:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 1c9863240f4fa569513e578856f1fa11 SHA-1: 6ae71913ab8a576e4db1a8e3dee87a89aebb992d SHA-256: 9e4a2459a87e42bfe8b1ba5eabefbff7e2f11868508a3a6a6ab1356795d27e52
96 Risk Score

Malware Insights

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

The PDF was identified as malicious by an ML classifier and contains numerous links, many pointing to compromised CMS upload directories. The document body, though heavily obfuscated, suggests it is intended to act as a link farm, potentially for SEO manipulation or to direct users to malicious content. The presence of multiple distinct hosts and the use of 'utm_term' parameters in some URLs further support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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://zoldlepes.hu/userfiles/file/womizapudekugifo.pdf In PDF document text
    • http://schokoladenfontaene.de/idata/bizidutipesatawanajukivaz.pdfIn PDF document text
    • http://urbanconstructions.org/images/uploadedimages/file/90905078779.pdfIn PDF document text
    • https://www.truegridpaver.com/wp-content/plugins/super-forms/uploads/php/files/4ddf719eb67c9d5c8960fef6fb3eeb82/84047620688.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ed2df70e28---70944616007.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/a2238b77966012509720d2f64e696677/86076026466.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16077b7ecbf3a6---62254509314.pdfIn PDF document text
    • http://vitanova-cattery.com/upload/file/dusotanaxetusaku.pdfIn PDF document text
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/dcc85230304cf0e8653cf52d3dfde04f/43624338743.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608cc55ef047f---91700026821.pdfIn PDF document text
    • http://qianlong99.org/ckfinder/userfiles/files/37764515988.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/3d6065bc49286070ffb7804abea1a029/56229052800.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/ir397bcc0cl5bboiueug6v9c1t/26866903526.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/39db0e993d2da8e5201198fde7be081a/rawotanogodiwuxudelo.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/PmAiG5ZyT-k/uplcv?utm_term=adjusting+entries+pptPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c465.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC465 4952 bytes
SHA-256: c57bb1ac31fe65440ed7ff9dde1b7c337875c247473a056e011668dfa8f2233b
font_01_sfnt_off0000d555.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD555 10668 bytes
SHA-256: 17db6d04800f8faab3a4fe7a2e798918a81161da78ded82f8501d90800aac5d8

Open this report in the interactive analyzer, or submit your own file for analysis.