Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e58c25989c525d4…

MALICIOUS

PDF

70.8 KB Created: 2021-09-25 16:59:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 0982723fd3943fd76e662433a627d5e5 SHA-1: b49aaa6ab34bc17e70f577a1c47983a9637c6eba SHA-256: 9e58c25989c525d4724ace7f2d528a1135db140ebfded87068c6443ca87fe499
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised websites or disposable hosting, indicative of a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://tuanlongland.com/upload/files/sapegaxijevumo.pdf In PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613be6e38124b---49951881411.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161364b9b54764---varixugasovove.pdfIn PDF document text
    • http://synagoge-stommeln.de/ckfinder/userfiles/files/voxuditetewifobov.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/dizizelutofof.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/nezosimanezubogopewek.pdfIn PDF document text
    • https://podimercrm.com/img/files/wijuruzikimasinekarog.pdfIn PDF document text
    • http://csc-021.com/userfiles/file/20210911011208_hbb6ka.pdfIn PDF document text
    • https://soswzgierz.pl/web/uploads/files/47098823646.pdfIn PDF document text
    • http://americasbestwingspa.iorderfoods.com/uploads/files/32108685413.pdfIn PDF document text
    • http://777mto.com/contents/files/57564319659.pdfIn PDF document text
    • http://myucmas.com/userfiles/file/kolinawegote.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1613a911581aa9---wojiremakazefarozifozobu.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148c8f15984a---wiwerikifon.pdfIn PDF document text
    • http://oprandi.it/userfiles/files/14708293089.pdfIn PDF document text
    • http://sp3siemianowice.pl/userFiles/files/46460663275.pdfIn PDF document text
    • http://siltherm.com/ckfinder/userfiles/files/26408279512.pdfIn PDF document text
    • https://leciv.fr/uploads/FCK_files/file/46757492042.pdfIn PDF document text
    • http://khangvietdn.com/uploads/file/minine.pdfIn PDF document text
    • http://bloemenwinkelindex.nl/images/uploads/41856785057.pdfIn PDF document text
    • https://wodepcb.cn/uploadfiles/files/26954411877.pdfIn PDF document text
    • https://ismart99.net/upload/files/rilepanobavivuledumolabo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=akira+live+wallpaperPDF 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_off0000b1a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1A3 9980 bytes
SHA-256: f7683df016860a2e71d1e463f5f7a0afacf6877f04bece84931b245cfd5f7080
font_01_sfnt_off0000c7e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7E0 17892 bytes
SHA-256: f022f5777a82df46b60938fab09314d07f9d1ebdbf1e31841e3eee5de4e8cd49
font_02_sfnt_off0000f554.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF554 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1