Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc7c15100196001c…

MALICIOUS

PDF

75.3 KB Created: 2021-09-18 06:18:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 193bf4ce64ccf1874432284a8d3bce96 SHA-1: 4a81c524a719dda62f5d09101fa0383dfddc6ccc SHA-256: dc7c15100196001ccc5d901ec742414f82698c427d66ef87d7ea3cb0abd919b3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, and the document body was unreadable binary data, so the attack pattern is inferred from the URL structure and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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=fifa+14+mb PDF link annotation
    • https://fotobolfestmeny.hu/mvc/userfiles/file/raxatalupilaluwirenenatu.pdfIn PDF document text
    • http://www.detskaoptika.cz/ckfinder/userfiles/files/dutawetedafimetumazuten.pdfIn PDF document text
    • https://albizy.com/ckfinder/userfiles/files/67382878213.pdfIn PDF document text
    • https://sabresources.com/FCKuploads/file/89595096374.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/a1cid4dl7v0kt4t846jfht0li8/repedasudemox.pdfIn PDF document text
    • http://dailitara.lt/bites/uploads/file/72015036751.pdfIn PDF document text
    • https://www.vignolaweb.it/ckfinder/userfiles/files/beboj.pdfIn PDF document text
    • https://cebrium.ssnn.ro/images/81102526101.pdfIn PDF document text
    • http://placidlakes.com/larpm/uploads/file/boset.pdfIn PDF document text
    • http://loca-granderoue-montaletang.com/ckfinder/userfiles/files/marakup.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/1c8dc4ee0b1139ce56c4cf380e78956b/91385467518.pdfIn PDF document text
    • https://www.hkha.org/ckfinder/userfiles/files/vimadaxe.pdfIn PDF document text
    • http://ozdesignhouse.com/app/webroot/uploads/files/52805896441.pdfIn PDF document text
    • http://blackivy.pl/userfiles/file/minapenuxikuzuxudofexol.pdfIn PDF document text
    • https://kratky.eu/files/file/35701191153.pdfIn PDF document text
    • https://jimsdelibrookhaven.com/demo/jimsdeli/admin/userfilesfile/59024101234.pdfIn PDF document text
    • https://mamo-tato.ro/userfiles/file/89578991021.pdfIn PDF document text
    • https://aymsoft.us/aym_image/files/rojejimepa.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138dd02b687d---9754430277.pdfIn PDF document text
    • http://nuitsdartistes.eu/images/file/rixapus.pdfIn PDF document text
    • https://duragloss.pl/userfiles/file/45666107283.pdfIn PDF document text
    • https://openkomm.yussfone-crm.com/userfiles/file/kuzinubozexavobaniwe.pdfIn PDF document text
    • http://studiolaviano.it/userfiles/files/desalejit.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_off0000c5f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5F7 17036 bytes
SHA-256: 7fe2e202c17fdf0b0fe2c8ac8f554f7989d7eaac3c5f8bc7d267ff59ebc968c8
font_01_sfnt_off0000f241.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF241 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010a57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A57 9856 bytes
SHA-256: 6bc22150811ac43c6864535dd23bb1abf572aec29074b0b932df03e84175287b