Malicious PDF — malware analysis report

Static analysis result for SHA-256 46e8f1aa50493935…

MALICIOUS

PDF

75.2 KB Created: 2021-07-03 16:47:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 12f54a00396bc45305a0f99adaa5ba6e SHA-1: e59841b2307a2fe613c69d39135426768cd7e017 SHA-256: 46e8f1aa504939354543e543cce3e0c1b883c449bfdfc9bae4dd6cbe5ccf2d8d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics indicate the document functions as a link farm, directing users to multiple external websites, many of which are hosted on compromised CMS platforms or disposable domains. The presence of embedded URIs and the overall structure suggest an attempt to redirect users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://medvor.ru/uplcv?utm_term=differentiate+mechanical+and+chemical+weathering PDF link annotation
    • http://extintoresorigen.com/images/editor/gepigi.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/bbf53af3bd1d1051fac5477fb2553f66/pagakaruremiruwozegame.pdfIn PDF document text
    • http://allaboutdowney.com/userimages/zonepivusi.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e365bb8cfa---76077172454.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/26a6ab95a437a563b2668ad3e01a374e/rofomidenozuduvadix.pdfIn PDF document text
    • http://adveotec.com/img/file/57214995204.pdfIn PDF document text
    • http://gdbchurch.com/clients/43262/File/gugebim.pdfIn PDF document text
    • https://protradingindia.net/userfiles/file/53833284879.pdfIn PDF document text
    • https://riolospettacoli.it/filesUploads/file/67686609260.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/819d229314e598a7017585473f9c0247/12544870371.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/qnaf1dp830tak10dulvhnj9me3/6648515842.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/7vnughittacaqudhtho572sad6/33892826933.pdfIn PDF document text
    • https://camgloberealtor.com/userfiles/file/metedarax.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad956a67f02---92458634036.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160808018b9a7a---44675608996.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16088c0646be04---vitumafomodisuwipor.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160996db59a8bc---loneg.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/42fo0vutv3a1v94li7s98tbh13/77999306053.pdfIn PDF document text
    • http://emilygrilltogo.com/uploads/files/41943895024.pdfIn PDF document text
    • http://grodgolf.com/clients/f/fd/fd83fa7079552abb47853a85229f74c1/File/286444203.pdfIn PDF document text
    • http://strojsteel.cz/webpagebuilder/ckfinder/userfiles/files/walekup.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_off0000c398.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC398 10720 bytes
SHA-256: efe64cef8e3ef41b8137628e7a84eb579ff5e07325420bd261b6d38ad41dbf42
font_01_sfnt_off0000dbd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBD9 16768 bytes
SHA-256: 5c8e34b3b5dad86eca3e9e0d01e05693694d1a4a1fb273011dc7a2dbd580cbaf
font_02_sfnt_off00010764.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10764 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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