Malicious PDF — malware analysis report

Static analysis result for SHA-256 1734d1e4db5ac322…

MALICIOUS

PDF

83.6 KB Created: 2021-07-18 19:12:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 32df9ad5fa9a51e59457eb57b29b15f7 SHA-1: f9eb82d0178a404ee599b366ad8838038e3d48a2 SHA-256: 1734d1e4db5ac322cb5cc3e45d00d10b1edd2ab0b52f635dc356d92051a63f15
156 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to numerous other PDF files hosted on compromised WordPress sites. This pattern is often used for SEO manipulation or to distribute further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://amerismithenterprises.com/wp-content/plugins/super-forms/uploads/php/files/c7422a36a38913da431e86231216edca/dagusaw.pdf In PDF document text
    • http://pampa.be/uploads/userfiles/files/66261553992.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/77d1c60e8c5e62e2687a60a8af3d7454/norisiwituk.pdfIn PDF document text
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e8b053af7b---6500907127.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/95531637425.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9efb8576ec---dagusujaleg.pdfIn PDF document text
    • http://rencontres-icare.org/userfiles/file/90774098498.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/55ae4dd677718fa8bdf44c81a8d27318/50229813105.pdfIn PDF document text
    • https://wfca-czech.cz/temp/userfiles/files/47153196783.pdfIn PDF document text
    • http://jmdfhjl.com/fckeditor/userimages/file/91838772100.pdfIn PDF document text
    • https://carea2plus.com/wp-content/plugins/super-forms/uploads/php/files/1788f914a8b24834575e475edb9cd40b/bamoruzefigepa.pdfIn PDF document text
    • http://cs-web-design.de/ablage/userfiles/files/83964463683.pdfIn PDF document text
    • http://poorclarescork.ie/images/zerowefedikudizujaxar.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160806573c264c---42897931219.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a61e96b10c4---kimaxivef.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/1606d610f8233a---58077946163.pdfIn PDF document text
    • http://pkynfe.net/userfiles/file/nexikepepotib.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/10cse60f79pl2cguvhqfbu3ce5/49786840265.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/7dd730d7f1acad0ea806e4fd1f2a2e9f/lekigedupasuluwegaponat.pdfIn PDF document text
    • https://mama-light.net/business_school/uploads/file/nifuvir.pdfIn PDF document text
    • http://singlesync.com/userfiles/file/jofetojimex.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=60+day+rollover+rothPDF 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_off0000e533.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE533 10356 bytes
SHA-256: 2d4dc2fe627f5dab2707436e217e4ffdcdeabceaf106b70ed2ecf6c04b4b0f55
font_01_sfnt_off0000fcbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCBB 17116 bytes
SHA-256: d125e4562afe771151078db38331867537428a15ab1617ff0c6efa54762ab29b
font_02_sfnt_off0001295b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1295B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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