Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fd8a639852a0e76…

MALICIOUS

PDF

83.2 KB Created: 2021-09-03 16:25:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: c9f2bb55171a1132d8bc1980f92b538c SHA-1: a8efbc13fc4b8acb0911615901e9718242dc6a0e SHA-256: 8fd8a639852a0e76b98301c71107a375451234e31b5abeedc320215c938118d0
176 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm to distribute further malicious content or phish for information. The presence of embedded JavaScript, though not directly analyzed for specific actions, further supports the malicious intent of redirecting users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ae3e9f27884---satodejalopojadekefisa.pdf In PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/f44f35b5bc99730a73d0fb5045e7f2fa/bozixited.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afce4d110e3---gewopunebidogamuvejuf.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d6034b22e6---37375188129.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b095e67e180---ropazixifib.pdfIn PDF document text
    • http://ablerexthailand.com/userfiles/files/gijodedidezojobaxivo.pdfIn PDF document text
    • http://mayinmaunhat.com/upload/files/xufunelosefujej.pdfIn PDF document text
    • http://timebymtm.com/upload/files/sanax.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca832d9918---fufubadenifi.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160819e0ee9992---pixekutusidel.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc153b25d7---lokirinebemav.pdfIn PDF document text
    • https://morabia.fi/images/file/44362056694.pdfIn PDF document text
    • http://shmgec.com/Uploadfiles/files/92653530252.pdfIn PDF document text
    • https://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/69d5473dbb82c6ff6b4df13cb2c52986/dugodosofelarigotezorij.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/568f233d51dd4cd522a3bb0c74b05a30/14734445248.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/mapopawulaled.pdfIn PDF document text
    • https://filetorme.com/upload/files/luwudaxurezojunonodedeb.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/6f1fb7e82643536db42293a481dd2f6c/83587335607.pdfIn PDF document text
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/8d0va3ov63l919qfa4ng2aqsri/68199296462.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a22c575bb3c---webegekule.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d12c88a84b---karudusuxalexizemupu.pdfPDF link annotation
    • https://widepolymers.com/userfiles/file/50472018802.pdfIn PDF document text
    • http://goldenteriyaki.com/uploads/files/kupawuja.pdfIn PDF document text
    • http://csc025.com/userfiles/file/20210627164428_m2as2f.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/29643822811.pdfIn PDF document text
    • https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/91fgod4osov0db1ke68m0o7q41/zameb.pdfIn PDF document text
    • http://montaze.org/democms/userfiles/file/lovemivekav.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=cardiac+resynchronization+therapy+market+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://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_off0000db28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB28 11136 bytes
SHA-256: 20d9799fa0425116f24cad242425d465fa7599829c97debbd90585de505a45f1
font_01_sfnt_off0000f50e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF50E 18628 bytes
SHA-256: b2b004a48c43b17d698a8e8fc36e4b0c2572af87d525d823e931679784e2f501
font_02_sfnt_off00012648.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12648 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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