Malicious PDF — malware analysis report

Static analysis result for SHA-256 d67002b4a38e9e8a…

MALICIOUS

PDF

90.9 KB Created: 2021-09-13 09:46:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 44e0c9f4059454bcc3f3bd0214045e7e SHA-1: 7e84132a75894c0193eb817110436c91ce81590a SHA-256: d67002b4a38e9e8a8e509db4c84903c16ee9972b39a2a5036c506b9224f25b23
156 Risk Score

Malware Insights

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

This PDF was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to potentially compromised or disposable hosting sites, likely intended to lure users into downloading further malware or providing sensitive information. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics reinforces the nature of the document as a deceptive lure.

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://shiny-baby.com/fileimage/file/26735186306.pdf In PDF document text
    • http://cainghienbinhduong.com/uploads/userfiles/file/roxutalogo.pdfIn PDF document text
    • http://malovanesklomh.cz/images/file/kujebiba.pdfIn PDF document text
    • http://tencanpowder.com/d/files/84953115495.pdfIn PDF document text
    • https://economiadecomunion.com/ckfinder/userfiles/files/14618374757.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/9utg8dirrrp0687ibf5vqpunf2/11823931201.pdfIn PDF document text
    • http://nhahanghienminh68.com/upload/files/45631924909.pdfIn PDF document text
    • https://redengewinnt.com/userfiles/file/47225600495.pdfIn PDF document text
    • http://tverzhilservis.ru/foktver.ru/ckfinder/userfiles/files/81613454278.pdfIn PDF document text
    • https://jeanmarcrobion.fr/userfiles/file/92897745211.pdfIn PDF document text
    • http://sushinamu.com/uploads/files/29893473409.pdfIn PDF document text
    • https://envida-nieuws.nl/bsb_website/upload_fck/file/29615013250.pdfIn PDF document text
    • http://balie.overeembv-profielen.nl/upload/files/90470843031.pdfIn PDF document text
    • http://dragonera.cn/admin/userfiles/file/nazexakovuvolabazuki.pdfIn PDF document text
    • https://elitstroycraft.ru/source/file/rilogazabezazaf.pdfIn PDF document text
    • https://ipkameros.lt/userfiles/file/74050278366.pdfIn PDF document text
    • https://funbugs.ie/userfiles/file/sawuxulepatava.pdfIn PDF document text
    • https://aildf.in/userfiles/file/wolifedebisisokidi.pdfIn PDF document text
    • https://giaphutelecom.com/tctt/sites/aaa/file/lejutunelodemobijife.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/161301c987ab79---zutavatakifomafojen.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/16132c7e1880ae---99003961955.pdfIn PDF document text
    • http://szwygs.com/upload/rezafavedixosisipeto.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d95bd2a88b.pdfIn PDF document text
    • http://legalinet.eu/userfiles/files/junikilesamobemubi.pdfIn PDF document text
    • http://polishingmarblefloor.it/userfiles/files/dinifazisudilujewadil.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=pokemon+randomizer+download+itaPDF 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_off0000f9c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000111d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111D3 20128 bytes
SHA-256: 1ff063273b5f660d4a1b3cda4fc272c78f349bab2dfd17b095fab05e13184241
font_02_sfnt_off0001460e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1460E 10480 bytes
SHA-256: 7a82f974f50de2fe445281557bdb38620493ed9e17832ff7688a5fa45068b950

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