Malicious PDF — malware analysis report

Static analysis result for SHA-256 b079b4d20406e2bc…

MALICIOUS

PDF

85.3 KB Created: 2021-09-01 05:45:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 6d1c54baaa8d3be4b184da668565565d SHA-1: 4deef88059cd44bc66756b203c552cb64fb3f0f1 SHA-256: b079b4d20406e2bc5852e7aed0734a390242d6635d2fc33a1d794f24dfbe64a4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://smidgel.ru/uplcv?utm_term=large+dunkin+donuts+iced+coffee PDF link annotation
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160941d855f87e---lelaruxava.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/6uaajr5uv48vd1ucov3mprqac4/26810124245.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/292105065694.pdfIn PDF document text
    • https://schmitz.cz/res/file/gexaviwinamijetaxuvona.pdfIn PDF document text
    • http://nousgarage.com/userfiles/file/daninidokilevuti.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/31850023849.pdfIn PDF document text
    • https://nucamsa.es/userfiles/files/85821412524.pdfIn PDF document text
    • http://aloeverajuice.cz/files/file/sofirufufanexazataderuwo.pdfIn PDF document text
    • http://teerosy.com/ipp/images/uploads/files/zekunodozefu.pdfIn PDF document text
    • https://vili-al.com/uploads/wysiwyg/files/meberibufijepuro.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fae5fed3cfa---68912051766.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/gq0dgosnbeltnkktousvs7j110/fuwimaviporurifedidenija.pdfIn PDF document text
    • http://dobrejaja.com/Upload/file/64838420257.pdfIn PDF document text
    • https://firsatpin.com/calisma2/files/uploads/80938953190.pdfIn PDF document text
    • https://nicosiacaffe.it/file/rozixivuguvogo.pdfIn PDF document text
    • http://korsorlampang.net/user_img/files/94731500923.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/518caa7af9eadde0f12140fd862c18ed/49868633137.pdfIn PDF document text
    • http://brianhaymore.com/images/e/file/44671514093.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/2c22ead246ed4c4ad0e52bd8f65c9903/14275876919.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/3d0658f0384763b1ee60feaf7d326c3a/29007054956.pdfIn PDF document text
    • https://thinkhigh-tech.com/d/files/sudilawavefetipidikiti.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/semimumixilol.pdfIn PDF document text
    • 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e670.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE670 17768 bytes
SHA-256: f1c5b0562aa16cd030fe56982e0f0a02520d78eee7a7a1db0398895835b6a976
font_01_sfnt_off00011425.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11425 10752 bytes
SHA-256: 2254a23cd64c957b02eb9d726162c95c64933fcb62c47f51c67eb82542837747
font_02_sfnt_off00012cd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CD5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1