Malicious PDF — malware analysis report

Static analysis result for SHA-256 aae3e4a8eb6f34e6…

MALICIOUS

PDF

78.6 KB Created: 2021-07-02 17:57:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5dbf9dbd486f679a079e0fb6dac9ba67 SHA-1: 5cc2b24554419befc64300999106b488f65a2d45 SHA-256: aae3e4a8eb6f34e67965a6ab028142d1b4c9b52eca54d001e6fd55f08534c7f1
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these links. The document body is heavily obfuscated, preventing a clear understanding of its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://infrive.ru/uplcv?utm_term=is+it+possible+to+have+positive+acceleration+with+a+negative+velocity PDF link annotation
    • http://abwva.com/uploads/files/36987816590.pdfIn PDF document text
    • https://bohemiamaestro.com/webpagebuilder/ckfinder/userfiles/files/xirevanas.pdfIn PDF document text
    • http://tavernadelsnoguers.com/wp-content/plugins/super-forms/uploads/php/files/f6beb15943715f53c11d3acf8b17f8e5/6534424644.pdfIn PDF document text
    • http://arc-en-cielproduce.com/ckfinder/userfiles/files/59344581073.pdfIn PDF document text
    • http://lyzebrno.cz/userfiles/file/97245727619.pdfIn PDF document text
    • http://sitoad.com/bbqjoekey/files/202106130048178143.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/9025bc5b4bd16fbdcfff1dfbdd72cb62/tizexugomotirekaki.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/6cbc6cbc435dd6d8f308d5de2b5ebe02/bifidopapu.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb550b972aa---47627520020.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dd8ff5616bd---jisogolajotek.pdfIn PDF document text
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607353c9d05d2---54284438185.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160838f54aa568---43522525736.pdfIn PDF document text
    • https://horizontire.com/userfiles/file/18310501023.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608389c1c5bff---fapanujex.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a90beb08ed4---70240126978.pdfIn PDF document text
    • https://autotrans911.com/thread/admin/uploads/file/10240012385.pdfIn PDF document text
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/tosulekexarijuselifelukiz.pdfIn PDF document text
    • http://aep-tc.com/cache/fck_files/file/tazunopir.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160834052e62a8---64187151733.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dce89fb58f3---16535523589.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c5bf2397678---74348509487.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/b1ad0251314e36e1f7f06bafd3679416/tizerofu.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bb07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB07 11012 bytes
SHA-256: ef854eead4d8df1d1633ccb095a339094e294fc3b1bf1081a24a7aa49ffaeb7b
font_01_sfnt_off0000d473.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD473 16152 bytes
SHA-256: 3d8935529663bd2cd83a67e48e592f96cc23852ac5d57741031ea44d8f869f62
font_02_sfnt_off0000fe1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE1E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001162f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1162F 16252 bytes
SHA-256: bfc7ce51a1a9b37382af61f0075eb0cdb972126da031002d338643432d80e6e4

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