Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a4707af30905fed…

MALICIOUS

PDF

76.5 KB Created: 2021-09-07 02:51:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 532c8c357b29f227e904e07f9c6faaea SHA-1: 965fdb7556b8238d776025aa0764b4d32600cf7b SHA-256: 0a4707af30905fed6183992e63d714460c9ba7bdc1812e2d3d2fff4dedc13b45
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://vinmexindia.com/uploads/904030049.pdf In PDF document text
    • http://designpavelzapletal.cz/files/file/36754064964.pdfIn PDF document text
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/c210400c8c22431f60b72899a6839ff3/51946065869.pdfIn PDF document text
    • https://pbchistoryonline.org/uploads/file/wigebonunuvakefub.pdfIn PDF document text
    • http://bright-inter.com/file_media/file_image/file/92562062524.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608b48dba60d1---silulalogeveko.pdfIn PDF document text
    • https://vialivonica.eu/userfiles/files/xiwakerebazarafo.pdfIn PDF document text
    • http://www.diplomat2014.ru/ckfinder/userfiles/files/86392234701.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc7691b28f---biraxaregonof.pdfIn PDF document text
    • https://xn--faade-zra.ch/ckfinder/userfiles/files/jilekuditoralofurakejabek.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160f969579fb73---zewomi.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/wolutupoletivelita.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/48800188982.pdfIn PDF document text
    • http://elsekmont.eu/userfiles/file/70008006421.pdfIn PDF document text
    • http://xn----gtbercbfedtm3b.xn--p1ai/admin/ckfinder/userfiles/files/soxivurafazevapuworimubi.pdfIn PDF document text
    • https://ncsccalgary.com/userfiles/files/87276757674.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/8af78c96db2ae096243d03a4de045131/mobipalel.pdfIn PDF document text
    • http://vimbark.sk/editor_uploads/files/72198129450.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/16085d61b94210---rapaxewozolunuz.pdfIn PDF document text
    • http://przychodnia-felinskiego.pl/uploads/editor/file/nudubisalode.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/16100648833ca1---88746972875.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d22816846d7---kivenemevegasatal.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160fe07296e103---12335327178.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/coq4dk5sfbcgdc5pcq2gh35ncf/mufotivugonodovenolejep.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=convert+pdf+to+dwg+autocad+2018PDF 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_off0000c527.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC527 17180 bytes
SHA-256: afc5dee8e1e363797a14142523bf0d78247846eae1af56b90c1c1955a2028931
font_01_sfnt_off0000f198.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF198 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000109af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109AF 11272 bytes
SHA-256: 1373f3211b2385af53f1800723b2afdeedf28a841cca834b1292d2bea277c8df