Malicious PDF — malware analysis report

Static analysis result for SHA-256 137124da51908381…

MALICIOUS

PDF

103.0 KB Created: 2021-07-19 22:44:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: de9413374c689cb4e250c68143539bb7 SHA-1: 0075b2207a32b7a8b818cb5f173e456a39b4c248 SHA-256: 137124da519083812d35dedcc4253614d885486373418e4ab207cd406975545b
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites, indicating an attempt to distribute malicious content or conduct phishing. The ML classifier and ClamAV detection strongly suggest malicious intent. No scripts were extracted, but the structure and URL patterns are consistent with a lure document designed to redirect users to harmful destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9874

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://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078ccad5a4d1---30701645168.pdf In PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160dd9ef1d9a1d---4284519637.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160d6ed9b8bfd6---donomeluj.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f01c5d6c7b---7116996689.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/f22bfef026b20d960ed5c581232a8e35/69385859667.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/ec9d938f7781188e57f3237fa2d3ee11/ruzofuwopewaxevosufofow.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/05f705bcdfb7c7f7431fb7afaaf9c18f/nomikozaxavu.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160f13cc9562f3---43060445882.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dff293281b---wokitulajelas.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/ao9skhtlju3kvmt3gjvca4kfee/dovokexoz.pdfIn PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/1rmvvckpbh8jeqbkk6bho6bsao/vubetapitidifex.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/99ffabcb9c5ff25552ed773acf51940b/rumikiwapilejovanoze.pdfIn PDF document text
    • http://cn-biyoute.com/d/files/delejesekerogazubirizi.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160df6ed871b7a---49589498496.pdfIn PDF document text
    • http://eltonltd.ru/sites/default/files/uploads/selakebonurijasurejowepaz.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/48405ca151ee4db93de6ecd63a6a9f84/dibopaf.pdfIn PDF document text
    • https://dentalrud.com/userfiles/file/zesijajokipeberod.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb034d27d91---41329512073.pdfIn PDF document text
    • https://roweryelectra.pl/app/webroot/uploads/file/16223000106703.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/ihkunpdo3imsbjjp9ojdulqi8v/39825439231.pdfIn PDF document text
    • https://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/3a0i6ot5e8d14ou037t41ko6p3/vefabewuxeluvuna.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/b1512580448395e877ffa132f18bdbe0/mokafivodejolurejewis.pdfIn PDF document text
    • https://argumentua.com/i/file/badopemelutarizuwa.pdfIn PDF document text
    • https://vegan-eshop.cz/data/file/tuzexazowenevab.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/hqmvmrqjff6794sj43bk0q36p5/kurijifavudadiju.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=forest+hill+academyPDF link annotation
    • 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off000171ea.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x171EA 18060 bytes
SHA-256: eed98b67b36bc87631048869e3a61f5c1c298a846a70dc585b9eb791eb5f0db2
font_00_sfnt_off000116d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116D7 10624 bytes
SHA-256: 97f484707730e65b4ed3e3be7276cc8ee9a56de30fcad59c2cdd5d99de15d651
font_01_sfnt_off00012f2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F2B 16496 bytes
SHA-256: 87edcd9269b13566767d81f5aae4fea25a0a3a401a3d3035abd59663e64d6a7e
font_02_sfnt_off000159d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x159D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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