Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f00b863f4c91ae0…

MALICIOUS

PDF

81.8 KB Created: 2021-07-05 22:19:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 44b08836a1717f872735f607eda8a62a SHA-1: f51f2534b053b86fc4058df9d8e9f7a96dcbb572 SHA-256: 8f00b863f4c91ae063f6a819ff8cdff4315347ddda1ff10c7e21f9c183a833ca
124 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV, specifically as a phishing trojan. Static analysis reveals it functions as a link farm, directing users to multiple compromised WordPress sites and potentially other malicious URLs. The presence of numerous links on disposable hosting and the use of UTM parameters suggest an attempt to obscure the true destination and potentially engage in SEO poisoning for malicious purposes.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4208

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://huntic.ru/uplcv?utm_term=bass+clarinet+excerpts PDF link annotation
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/bidoeibmvndqj0o1qjapsrplpo/11949087330.pdfIn PDF document text
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/6d5b4ab7b931469e2639489e82d71e07/nagenerus.pdfIn PDF document text
    • http://altinay-law.com/images/file/69599936100.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/0065d171759343c1633ecc0e71ed52f0/95814639679.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f533b1ade1---50913442895.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079d46e65001---64292840285.pdfIn PDF document text
    • http://emrc.ie/upload/imagecontent/file/65430687667.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075cf7ee23cb---nuwefijujubi.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ef38b77088---27947105811.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ac1559a839b---levagutokabujubidevufe.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/f937929346057ae832492f4b0d060049/fobavojuvas.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/d901181fcaccefb87c6155dfc113e9a3/76927873054.pdfIn PDF document text
    • https://xn--mietkndigungsrecht-best-gpc.de/userfiles/file/xibavadusizosiwesikejiza.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/bcade10cf0e7aec5aedbc40ca0b97c63/43943779052.pdfIn PDF document text
    • https://whitesal.com/data/images/file/5357_20210611201654.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/c1329aaf8076928e9e7c202fe10e03e9/20972035058.pdfIn PDF document text
    • http://khodahoanglang.com/admin/webroot/upload/image/files/23363874847.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076f9373e998---nokosokevedumojewunige.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/f262ff3dc3ee770b4c1d0b48566aff54/sipipidonerosivok.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160850588cd5ea---mapitod.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160a04c0ea88d8---68857216526.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/7rdbeu8e7ku99lv5s1ljuhurke/37804623783.pdfIn PDF document text
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/bh3ukevs1skt3dfkk1rgmstl8g/nimafuduvoterevasemeb.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/tdfn0qmrepd36lqp68prtlgfd2/badonuvojiwu.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fa99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA99 16820 bytes
SHA-256: 105e6d56f57da461a76819f1872cdb5ea3027175125885da3f6524c15d5f4920
font_01_sfnt_off00012672.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12672 10404 bytes
SHA-256: 9e82f69af0e5a2079e5b106dba37007836199ce7d7975d250b447f4e2b778c68

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