Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8a0581bce1c3cfe…

MALICIOUS

PDF

63.7 KB Created: 2021-05-18 12:21:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 960634bb1e2fc4456705b7d8550520bf SHA-1: cdafc56cd7475c199d8b9dcbc78940e4842351b6 SHA-256: d8a0581bce1c3cfe8332643e4f08c155de3439f66ec4820e0a1cd25de8fd7399
154 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and a machine learning classifier. It contains numerous embedded URLs that point to compromised websites, suggesting it functions as a link farm. The primary purpose appears to be directing users to potentially malicious content hosted on these compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8678

Heuristics 5

  • 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
  • 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://smidgel.ru/uplcv?utm_term=livre+physique+chimie+terminale+sti2d+hachette+pdf
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f43364128b---39734963919.pdf
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ef56eee0af---waguromipilasimipu.pdf
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/d93ef456f95e66e33a5852316237626e/nexogexuvojofo.pdf
    • https://ltanimalpark.com/wp-content/plugins/super-forms/uploads/php/files/e87673dea151116ad597bc3027d90d00/kemarokukelivosabakaf.pdf
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/d3342beb628ece1d373bc1d412dafdeb/24144397828.pdf
    • https://taevlingar.se/images/pages/file/zokuloxobutowenevesowib.pdf
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/16098308c3c870---86311190477.pdf
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/16078811a26770---91925550436.pdf
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/16092798d88592---xakugevizatabawer.pdf
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/idgm851ejv3ne6oa60ev3bjvvf/gobatubemow.pdf
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/it6stg8st7cqc2ekt2531r7ckn/58340678508.pdf
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a1e647850e---fenegajamabe.pdf
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a27ecbae458---sifomuwugipedojo.pdf
    • https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/524c9c56239dd000473a6641db474992/62982136351.pdf
    • http://short-story.ru/upload/file/56774198486.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000edf2.bin
2599d8ab82f8d107b9f37c364973df61c83d31ba257bb4b8643a85725929fadb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF2 5756 bytes

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