Malicious PDF — malware analysis report

Static analysis result for SHA-256 50e1a2d2d7f87d25…

MALICIOUS

PDF

88.7 KB Created: 2021-07-23 03:41:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 882c5aeb6ab5ee4f1319215afe9a3735 SHA-1: fa18f8e47761f3920a197c52735f7d9e7cbe395a SHA-256: 50e1a2d2d7f87d25c3072a8844085a8aef2004a455675dddc5ca52ba378f99a5
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, directing users to multiple external websites, many of which are hosted on compromised CMS upload storage. The document body is heavily obfuscated, preventing a clear understanding of its specific content, but the presence of numerous links to potentially malicious sites indicates a phishing or redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 http://ongnuocdenhat.com/upload/files/21378591828.pdf In PDF document text
    • https://gionggiacam.com/ckfinder/userfiles/files/kevipopepexul.pdfIn PDF document text
    • http://winkeleninzundert.nl/uploadimages/files/nagowojokabevupibaj.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/zulafonadazizilawimab.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c7b25d8a960---88976488992.pdfIn PDF document text
    • http://marcus-1.com/FileData/ckfinder/files/20210618_753CB52D6601340D.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/23b994c00ec539576e0a133e3a153c46/jusugagabogurudel.pdfIn PDF document text
    • http://sashtraayurveda.com/ckfinder/userfiles/files/buzaruz.pdfIn PDF document text
    • https://flardochform.se/userfiles/file/46795075075.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5bbfc4ddd8---85625791099.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/a1abac5c30998d2070d581428c5e42db/49308440703.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/8fc9315cffe6fe0003415d124d901751/nalevak.pdfIn PDF document text
    • http://niestachow.pl/data/aktualnosci_imgs/file/88095368037.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608a93b8286f1---saligiwosaxerusiduze.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d921e25d5f4---38288410810.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609abfe35b44d---webuma.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/j97kquvu5laumvq86rkijrsj8a/madetolivubuwuruje.pdfIn PDF document text
    • http://metabolit-plus.ru/files/file/12708034728.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/55571b3de87ee6332a283b08f1ab4952/25202230990.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16088a858558df---25775071039.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///11211679110.pdfIn PDF document text
    • https://cakesandcupcakes.net/userfiles/files/zokutepikagami.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/8c23bdd627c7dfdd4fcf5fbf42c663b1/marugurobirukivalif.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/5fa2f3463328b40407546749f633efef/59585646455.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160826c599439c---88989460562.pdfIn PDF document text
    • http://vtaky.sk/media/file/38948907098.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/de931a063472a3d9ea553fb5859b21c9/menup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=over+salted+meatPDF 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f761.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF761 17764 bytes
SHA-256: f1bfa10ce979a7a56903029538a5459c60332129a5d4e034f7b1ad4e66f1fe3e
font_01_sfnt_off00012603.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12603 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013e1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E1A 10184 bytes
SHA-256: 0bec0da4533d293506916db444c9493e890f4bc52b77b8edc627471003ed837b

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