Malicious PDF — malware analysis report

Static analysis result for SHA-256 c69a3da6db04dbea…

MALICIOUS

PDF

95.0 KB Created: 2021-09-09 22:24:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c0cff96393ee3f8250b2689334dcec02 SHA-1: defd2a9ed93a3a7a29940450087b8820a2248bf1 SHA-256: c69a3da6db04dbeaa154becb8116317818478267984bd551daae509b0ce17a6d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised or disposable hosting, suggesting a link farm used for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and link farm heuristics strongly suggest it's designed to redirect users to malicious sites, likely via embedded JavaScript or other PDF exploits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://architettotoma.it/userfiles/files/nitowozeliganimorozuvugiw.pdf In PDF document text
    • https://telewebmarketing.com/FCKeditor/file/vuzopirolovigaruba.pdfIn PDF document text
    • http://langfordfinancialservices.com/userfiles/files/fusuxu.pdfIn PDF document text
    • http://kyanite.tv/userfiles/file/josexiwesub.pdfIn PDF document text
    • http://ugyvednok.hu/userfiles/file/juxuzixolab.pdfIn PDF document text
    • http://xn----8sbfeahwarn6ac1adp3fb2p.xn--p1ai/userfiles/file/jeterus.pdfIn PDF document text
    • https://cuatudongsaigon.vn/uploads/files/zokitisodezeti.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/1612f05f55eb1f---74350686671.pdfIn PDF document text
    • http://cncforginghammer.com/d/files/27384722602.pdfIn PDF document text
    • http://alfonsoguiggiarchitetto.it/userfiles/files/48548301271.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd9d2b34a6---risopodovumufevujada.pdfIn PDF document text
    • http://mastervin.ru/files/file/melotovasukolu.pdfIn PDF document text
    • https://economiadecomunion.net/ckfinder/userfiles/files/bubowomiketuravodu.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/349bc32e4abfaf2ea68eb9e3ce10e2d4/91653321846.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/futike.pdfIn PDF document text
    • https://sreekanakananda.com/ckfinder/userfiles/files/sunewukatumesed.pdfIn PDF document text
    • https://cplastik.net/data/cms/file/nelodifawisepelinujik.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/a79seda73c9ks4gka1160b34n7/62267130566.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161396f1d33299---jadoxupidajenatixidak.pdfIn PDF document text
    • https://iwistw.com/upload/files/12851518759.pdfIn PDF document text
    • http://noospc.ru/SITE/files/editor/file/21318519144.pdfIn PDF document text
    • http://brianhaymore.com/images/e/file/masipitutevujerumuv.pdfIn PDF document text
    • http://idroter.org/userfiles/files/1090155725.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=descendants+1+full+movie+freePDF 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_off00010ee4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EE4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000126f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126F6 17888 bytes
SHA-256: 45ecf3a63f00b9b78d1a1eb09a348b7446f869f894a75150814273c7bd75f90f
font_02_sfnt_off00015572.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15572 10856 bytes
SHA-256: 63111847e467d826d3ee458f483af4220a2932c31c205258e53f464267e7487c

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