Malicious PDF — malware analysis report

Static analysis result for SHA-256 da8477033ec4bf17…

MALICIOUS

PDF

79.9 KB Created: 2021-09-03 01:02:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 6a30229b561fd1b0a7b1ca9c3e233549 SHA-1: 1deb4e65850b6f84977735947cc3f4f6f3f683de SHA-256: da8477033ec4bf175bda15d10f66d35c49ba9b842f9478a528961752aabe70a1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting. The presence of external URIs and link farm heuristics strongly suggests a phishing or malware distribution scheme. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://garglob.ru/uplcv?utm_term=gastronomie+francaise+pdf PDF link annotation
    • https://travelworld.ro/userfiles/file/3616479226.pdfIn PDF document text
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/6guevgtm6b2v39au8h7us4fh1o/72754275727.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a14615e776c---dilevekarowujuxamipagezoj.pdfIn PDF document text
    • https://ijacr.net/assets_admin/ckfinder/core/connector/php/uploads/files/67958996312.pdfIn PDF document text
    • http://lukoilmarine.com/ckfinder/userfiles/files/17263447973.pdfIn PDF document text
    • http://cancercareresearch.com/userfiles/file/16899252974.pdfIn PDF document text
    • http://shengyaweb.com/uploadfile/file/2021072523272779.pdfIn PDF document text
    • http://muaah.ca/userfiles/files/35012232175.pdfIn PDF document text
    • http://perfectionistpaintingnj.com/ckfinder/userfiles/files/89310882629.pdfIn PDF document text
    • http://casier-a-bouteilles.fr/file/kibirux.pdfIn PDF document text
    • http://tfh-filter.hu/_user/file/16230716023.pdfIn PDF document text
    • https://eyescare.vn/app/webroot/upload/ckfinder/files/64197565091.pdfIn PDF document text
    • https://www.americansummercamps.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084a5744d1f1---zomat.pdfIn PDF document text
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/6f8d454466d6756b806ef431b12669bc/gorefuv.pdfIn PDF document text
    • http://jadeite.ru/images/file/sikisuxaponedat.pdfIn PDF document text
    • http://doctour.hu/uploads/ckfinder/userfiles/files/tomasabijozusi.pdfIn PDF document text
    • https://thietbidiensino.vn/media/ftp/file/mafuru.pdfIn PDF document text
    • http://okwmd.com/upload/fckeditor/file/89336159906.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/29171309973.pdfIn PDF document text
    • https://irantruck.ir/data/file/81722881986.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/jfvki8441d978vv3oooid0c1n3/bixukuzibasetexa.pdfIn PDF document text
    • 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_off0000ce86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE86 19604 bytes
SHA-256: b97b01c2dc7da35fbcf623ec932936e6b9da0b12e1e8ac627c7c9f0bfad3d327
font_01_sfnt_off0000ffcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFCC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000117e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117E3 10776 bytes
SHA-256: f1b87b60ea32203e222364774ff67b9a74c202155544e40beba9ba5dc5caab31