Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d74cec2f54df3c6…

MALICIOUS

PDF

72.7 KB Created: 2021-06-30 05:57:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: d2ca4c0296e7c2d0ff0826e1b533c839 SHA-1: 39ca0b47a747cb349450f1fb744fb1c847d31fad SHA-256: 8d74cec2f54df3c6904b0510ee73fb032daae864c3c55ac51941a9add9f00a75
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple compromised websites hosted on disposable domains. These links likely serve as a lure for phishing or to download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://archism.ru/uplcv?utm_term=less+than+greater+than+symbols PDF link annotation
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070b246ee4ca---20595597283.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/31876aef557a9e9cd6d2fec2787f7f1c/59685322756.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/2cjmnd21mnm34rgrnul570iv91/remevazuwojugewonamofe.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160c5ede6b46f0---3160888733.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/685d82e9934446158527f580559fea71/78963383278.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/16076af4247155---98863350448.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/160751b483f391---sosevevosibumege.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/805f1a7db465448848d93ac1a38d6c34/wilujakajuninak.pdfIn PDF document text
    • http://tamker.hu/userfiles/file/36376413012.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3522244790---89358767040.pdfIn PDF document text
    • http://www.houstonorientalrug.com/ckfinder/userfiles/files/10378283361.pdfIn PDF document text
    • http://short-story.ru/upload/file/80167889360.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160b54ce2c6eb0---godete.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075e0bbd04a1---luzage.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607562ce6979e---78879172586.pdfIn PDF document text
    • https://ubranni.com/uploader/files/bufejegeraxurifok.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/resekitadedojegudereze.pdfIn PDF document text
    • https://advantagelic.com/singhania/downloads/file/bojekokipanejizi.pdfIn PDF document text
    • http://inwallendorf.de/userfiles/file/90221089931.pdfIn PDF document text
    • http://cnkls.com/userfiles/file/1624211026.pdfIn PDF document text
    • http://bioident.pl/photos_fck/file/85008126318.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16078acebcf5ef---14370553043.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a15043cd3c8---47107729647.pdfIn PDF document text
    • https://cubic.is/userfiles/file/15109149659.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_off0000bb07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB07 16292 bytes
SHA-256: e2aa25efc784b2e79e0097dfab33660426b32f52349e5e2000721144f24c1517
font_01_sfnt_off0000e560.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE560 10676 bytes
SHA-256: 25e4802ab1809e97f6ce2f778f0216741b41926f9f068d19393fc51a20d9a82c
font_02_sfnt_off0000fdb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDB5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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