Malicious PDF — malware analysis report

Static analysis result for SHA-256 f05dad37b015616c…

MALICIOUS

PDF

91.5 KB Created: 2021-06-10 12:09:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 8dfe14fe00c32404aaa3b7e9fc1cd2a0 SHA-1: d2658b2a12d2380fbb7ca4883283d7d6f6adabc3 SHA-256: f05dad37b015616c7ab49e3c0ff7e0eed9f5c2c9a57f7969271a4f53f63d208f
154 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and 'Qt', indicating it was likely generated by a tool rather than being a legitimate document. The presence of external links and the overall structure strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8759

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://nomylo.ru/uplcv?utm_term=change+mkv+to+mp4+online+free PDF link annotation
    • http://humanlitech.com/files/files/28741102655.pdfIn PDF document text
    • https://ahreco.com/uploads/news_file/xakirivixoputixijarasixex.pdfIn PDF document text
    • https://nbtele.com/en/cache/fck_files/file/70687997308.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/7ap565sga88ueavj4vl0630t9b/fobusaxeba.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b8de032832e---48816133652.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b9cf9330514---71313638460.pdfIn PDF document text
    • http://seabeachthailand.com/UserFiles/file/mijamuwosilevapanoj.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/cb60e901c69a9b1abf9158bdc5fa7f65/getagepif.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/1a8682ed849df615153b47b24704e21b/foxefesunuxikupixu.pdfIn PDF document text
    • https://plasy.com/uploads/file/matufalune.pdfIn PDF document text
    • http://myshopekerala.com/userfiles/file/7875517299.pdfIn PDF document text
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160910a53e8770---zulog.pdfIn PDF document text
    • http://ivepe-elearning.gr/assets/UserFiles/mainHome/file/faxanidiwogana.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609ec7b28fdc5---23912208291.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/db744a4d9f40dc1010510516754d26e7/91242256647.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d540.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD540 45196 bytes
SHA-256: e4c1f978254d61b113d460bbdaf45bf6905d673ac76ca097ce0a59dc5868bb82
font_01_sfnt_off00015bf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15BF7 5256 bytes
SHA-256: 932532530ee2e92539e0263483b72aabb0bf619311560e3ad03037f82d03e55c

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