Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b4d9b704325419d…

MALICIOUS

PDF

70.7 KB Created: 2021-09-10 13:38:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2a728c8c32bc63ba8944fbd00d63c5fe SHA-1: c9f61eb3badbce6a5d7a79a90906dca2b41a8d1f SHA-256: 6b4d9b704325419d82adf125438b09303cc991a8a3b20ed4b64af88f5aedd9d8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and a link farm pointing to potentially compromised CMS uploads. The embedded JavaScript likely facilitates malicious actions, such as downloading a second-stage payload or redirecting the user to a phishing site. The link farm structure suggests an attempt to obscure the final destination and leverage disposable or compromised hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://shengyaweb.com/uploadfile/file/2021090700095460.pdf In PDF document text
    • http://tomekorea.com/userData/board/file/67860420257.pdfIn PDF document text
    • https://tagoproperties.com/ckfinder/userfiles/files/25029388202.pdfIn PDF document text
    • https://gamma-electronics-eg.com/userfiles/files/sawib.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/a6bab9fc9a25bea45efa2e6e139df3f8/jodilikoku.pdfIn PDF document text
    • https://erdenetpost.mn/userfiles/files/40123583600.pdfIn PDF document text
    • http://songhakbbq.com/uploads/files/39432879147.pdfIn PDF document text
    • https://irepairplus.nl/app/webroot/files/userfiles/files/nomalatukawowadororojax.pdfIn PDF document text
    • http://rama-sp.com/rama/webroot/js/ckfinder/userfiles/files/zijuwuduzupepopiwevotova.pdfIn PDF document text
    • https://mexico-airport-transfers.com/ckfinder/userfiles/files/zufitubeladoxumojixo.pdfIn PDF document text
    • https://onwater.my/uploads/file/55132213824.pdfIn PDF document text
    • http://shangrilatheshow.com/ckfinder/userfiles/files/75603153524.pdfIn PDF document text
    • https://irastuff.com/admin/ckfinder/uploads/files/lilegop.pdfIn PDF document text
    • http://calisnt.com/uploads/files/ketapamazigafesuni.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a809e44d7f---22249309893.pdfIn PDF document text
    • https://dafelia.com/files/liwuzo.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137e68f3bf87---gamedefakifabevi.pdfIn PDF document text
    • https://pankajplast.com/ckfinder/userfiles/files/49695019024.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16137655250a1e---gewufopikakelora.pdfIn PDF document text
    • http://dralituncer.net/userfiles/file/91571846962.pdfIn PDF document text
    • https://saksisan.com/upload/ckfinder/files/lemifi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=malaysia+amnesia+moviePDF 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_off0000b670.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB670 15720 bytes
SHA-256: f3f8f641f7f7d0e1dec8efcc43d9fb7da4dd1548f2745454889f9959912c219c
font_01_sfnt_off0000de7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE7B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f692.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF692 10244 bytes
SHA-256: 5fea193c2f15e478941d22ca2210dc213758514506f1a8d45c6a485ec6677298

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