Malicious PDF — malware analysis report

Static analysis result for SHA-256 6276d059f65e8d04…

MALICIOUS

PDF

84.2 KB Created: 2021-09-08 06:03:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 0fa709cb42629ee1837f86aaff6fe5cc SHA-1: 315778425fd2b819da50d907385fdacc98cdf232 SHA-256: 6276d059f65e8d04599494f6ad3563f065ace1e750c576066de4a76b3098b27a
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to potentially compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users. The presence of external URIs and a link farm heuristic strongly indicates an attempt to lead users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://coumert.com/images/file/79980979948.pdf In PDF document text
    • http://bannails.com/fckeditor_userfiles/file/30915503651.pdfIn PDF document text
    • https://aporpeter.ro/userfiles/file/gasowomu.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/16085507f7cb84---kibefefiruratafoselobar.pdfIn PDF document text
    • http://giaydantuongphongngudep.com/images/news/file/72259626511.pdfIn PDF document text
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc352b4c17f---jitasigokafigugo.pdfIn PDF document text
    • http://www.armstrongre.com/files/files/82315299430.pdfIn PDF document text
    • http://jiehuist.com/userfiles/files/57204622457.pdfIn PDF document text
    • https://asiarsolutions.com/userfiles/file/32716081908.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/8fdb6a97a9d83bdace9d5f407dc6c3b0/46204752574.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/7317300bf0f645f62dd7370b10ed3e49/87514456191.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a7ac6f0e533---72290006991.pdfIn PDF document text
    • https://playerpress.com/ckfinder/userfiles/files/40050217610.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610735c2a2997---fakofeja.pdfIn PDF document text
    • http://lezeckastenakosice.sk/upload/files/bolidumebopifinokowunipo.pdfIn PDF document text
    • https://anyimaker.com/upload/users/files/kotileguda.pdfIn PDF document text
    • https://www.tzounakos-insurance.gr/ckfinder/userfiles/files/denafigofej.pdfIn PDF document text
    • https://roweryelectra.eu/app/webroot/uploads/file/16233636885463.pdfIn PDF document text
    • http://reszke.pl/fckeditor/editor/filemanager/connectors/php/file/rawem.pdfIn PDF document text
    • http://kssi.ir/public/userfiles/file/wisave.pdfIn PDF document text
    • http://travelshops.pl/userfiles/file/salununu.pdfIn PDF document text
    • https://vanphongphamhienluong.com/upload/files/97693210183.pdfIn PDF document text
    • http://eatatrudy.com/uploads/files/tirazepogoxok.pdfIn PDF document text
    • http://viviapalermo.com/userfiles/files/64498656430.pdfIn PDF document text
    • http://guides2alpes.org/uploads/file/kewerujejatatababigedak.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=geography+states+and+capitals+worksheetsPDF 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_off0000e15c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE15C 11124 bytes
SHA-256: bf9f9d5be1f340dae55b6253055e834953b632aeaa8f47f9de2599b8df5f0c44
font_01_sfnt_off0000fb2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB2A 18296 bytes
SHA-256: af5e234177ad3427d1346fd1e3a2bb2afd89c2cf524f5d58fcf54c4c97fbcdff
font_02_sfnt_off00012acc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ACC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1