Malicious PDF — malware analysis report

Static analysis result for SHA-256 3861e8471cbdcf51…

MALICIOUS

PDF

118.7 KB Created: 2021-06-25 00:37:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ccadb8a2ce92a2ce31b41fdbfc0e0b52 SHA-1: 1552f7c37d1ad49b2a34ec1d94cd1ee18d8f5120 SHA-256: 3861e8471cbdcf51024ca0cdd6c591838ce71b675ddad7ffa979412548cd3f7c
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm for phishing or malware distribution. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9507

Heuristics 5

  • 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
  • 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://matskaren.se/anvandarbilder/203/files/lorirovarusewujamaroturaw.pdf
    • http://plncse.hu/php_data/file/60929858928.pdf
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/sdjalbt165rclv5e07r03gqpjq/58227458641.pdf
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1018becc26---45497419464.pdf
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099e5342ca5b---35854078480.pdf
    • https://deniz-sogutma.org/img/userfiles/file/zujofovezinewefi.pdf
    • http://acpiindia.com/userfiles/file/89076341619.pdf
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf1cd33dc1---57233730016.pdf
    • https://tectrongim.com/uploads/files/tapiganiv.pdf
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160796b360ff17---kuvixudedezuva.pdf
    • https://dodomacnosti.net/data/file/gipixijoxemikiremi.pdf
    • https://ankaratemizlikcim.com/depo/sayfaresim/file/fitiwepaki.pdf
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/c9b8a8cd1c70b74ba959a9136d3547b9/92046491327.pdf
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/c8d1273bf837ab35bdff592e825347b7/25270223896.pdf
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/3facf33e257791018d4f0746c6281265/24123117883.pdf
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a31f9e082c3---15149071368.pdf
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/844af51b589b89030d255328670ad125/99040139342.pdf
    • http://limoride.net/gallery/file/pozijum.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=android+application+development+tutorials+pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001b297.bin
1b8a48ed7e46401d5b938b34f2b28e93b6ded6c1c523142d083e794baedab240		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1B297 5352 bytes

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