Malicious PDF — malware analysis report

Static analysis result for SHA-256 af13384213e7bbaa…

MALICIOUS

PDF

80.7 KB Created: 2021-09-15 12:38:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 592a78e897be31a74d04e3db44286b5b SHA-1: 128bda6a1596f20545bc63955281042a8cdd27af SHA-256: af13384213e7bbaa2db483823f26e3241ac71684496599ed492500b0422130d7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is a PDF file flagged by ClamAV and an ML classifier as malicious. It contains a link farm with numerous URLs pointing to potentially compromised websites, suggesting a phishing or malware distribution scheme. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a deliberate attempt to obscure the true destination through disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://farmacieitaliane.com/documenti/file/mexajedozekodokuxure.pdf In PDF document text
    • https://istocdukkan.com/userfiles/files/40924873996.pdfIn PDF document text
    • https://artgallery.devctn.com/ckfinder/userfiles/files/mefabufal.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613bca49cb234---gelubumijebuzid.pdfIn PDF document text
    • https://sofupingame.com/calisma2/files/uploads/nibajelexupu.pdfIn PDF document text
    • http://zafirkort.com/uploads/files/xufipavuripukufovej.pdfIn PDF document text
    • https://at1apigroup3.com/contents/files/sulesemas.pdfIn PDF document text
    • https://shopexpert.com/app/webroot/files/userfiles/files/94764565425.pdfIn PDF document text
    • http://senvietsystem.com/ckeditor/upload/files/wizifok.pdfIn PDF document text
    • https://andymullinscommercial.com/home/andy/public_html/ckfinder/userfiles/files/nisorodamomowek.pdfIn PDF document text
    • https://elnativocoffee.com/silver/upload/files/gafiloxejil.pdfIn PDF document text
    • http://centronegozi.com/public/zulitotebelazavunuzud.pdfIn PDF document text
    • http://bernardthevenet.fr/ckfinder/userfiles/files/65663987367.pdfIn PDF document text
    • http://divorce-difficile.fr/userfiles/file/47259261423.pdfIn PDF document text
    • https://hattoco.vn/images/ckeditor/files/sajetisuganozofilomoru.pdfIn PDF document text
    • https://www.acta-mobilier.fr/ckfinder/userfiles/files/kevofona.pdfIn PDF document text
    • http://tnmetalworks.com/images/files/18534470608.pdfIn PDF document text
    • http://chinasoftcore.com/userfiles/file///jipawujibarozured.pdfIn PDF document text
    • http://energo-winstal.pl/userfiles/file/warofezif.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/16130775e8e14f---biporidatome.pdfIn PDF document text
    • http://tsg-vaganovskoe.ru/ckfinder/userfiles/files/74863321939.pdfIn PDF document text
    • http://ritadas.in/userfiles/file/nuwosabafedirubafuga.pdfIn PDF document text
    • http://taociren.com/upload/file/210908001004603252d9135ejb8o8f.pdfIn PDF document text
    • http://7profi.net/userfiles/file/jolibodesulejojisosufi.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/c7c8f2e937b48e791f13e1626e51f38d/76844344070.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=softonic+android+apps+downloadPDF 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_off0000d692.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD692 10644 bytes
SHA-256: e6281cd2d4849af8cc012ce7d2f4e43f288bc49a8a5bc8e48c173c288500c7b6
font_01_sfnt_off0000ef17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF17 17844 bytes
SHA-256: ee31cc2ae1ddbc820a8bd07eb158bdfbbacce3b896d68f842363c46991a912a5
font_02_sfnt_off00011d5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D5E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1