Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb4e5259712135ff…

MALICIOUS

PDF

93.7 KB Created: 2021-09-06 10:35:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d34061604d7a5c7cc728ab1c9c707f0d SHA-1: 67e71e406eee1d8060786357a26c3edd57c03de7 SHA-256: eb4e5259712135ff4a4a48b105b3bb9dc4c85d3cf279eec806b63d2ae0c25112
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support its malicious nature. The file's structure and URL patterns are consistent with a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://mauspro.net/upload/files/gavovod.pdf In PDF document text
    • http://eurekaloggers1970.com/clients/a/a4/a4917853023b9a70bc4506ca58f09c65/File/puxufoxufawarasaxugokipu.pdfIn PDF document text
    • https://camgloberealtor.com/userfiles/file/48813709059.pdfIn PDF document text
    • https://www.restaurant-latableedevercel.com/ckfinder/userfiles/files/93734561595.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2a52b09ed7---36625469030.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160848c1e3b145---33246012627.pdfIn PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/1q965na10l5aq9oul9h8p7s8fc/zoxugof.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/81341b4351946beb94c9a6f463282b8d/nibexuxuja.pdfIn PDF document text
    • http://www.aqsclimited.com/EditorImages/file/30284726715.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1607353b638d4b---tilexodofawajosowemuz.pdfIn PDF document text
    • http://suarezbeltran.com/aym_images/files/vabejodubezonezegukazot.pdfIn PDF document text
    • https://foodvellythailand.com/upload/files/gakitufaneki.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072828eac721---wubejovot.pdfIn PDF document text
    • http://megalabsrl.it/userfiles/files/bobemutifazixasozitoz.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090d91516cb3---91355780010.pdfIn PDF document text
    • http://gotween.com/userfiles/file///bomuludatekaziw.pdfIn PDF document text
    • http://wabasnb.com/files/fckeditor/file/158558536660d2b75400962.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5d9546fc4e---wogetate.pdfIn PDF document text
    • https://hagakure.by/upload/editor/files/xoxuwadesibejolesob.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608191967c17f---zepumazarogamab.pdfIn PDF document text
    • http://hanifeugur.com/image/files/80365309210.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085bdece5c49---fopubuliguj.pdfIn PDF document text
    • http://pensionpoint.cz/userfiles/files/2019019134.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=respecting+boundaries+pdfPDF 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_off00010834.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10834 11036 bytes
SHA-256: 02476e64d1332f5090115d7a64103ec82f61d93f317ac97c155e4688bb98e22b
font_01_sfnt_off000121a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000139b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139B7 18208 bytes
SHA-256: 985dab39a24d36a82f9985b07b598a6075c347384d33bee906fc2af1a537813e

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