Malicious PDF — malware analysis report

Static analysis result for SHA-256 e64b26f2a5a6edb8…

MALICIOUS

PDF

76.5 KB Created: 2021-07-21 11:17:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: b2520066a672af7a00b2edea64f640f0 SHA-1: 4a931eed4cad83e0c011a367b5672cff6d6f2143 SHA-256: e64b26f2a5a6edb8328a56e1b08ac427982452b9df4652d28c82c0945f03de70
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/2c98bd9ca11a3a4c9844426ffc55636c/81119884789.pdf In PDF document text
    • http://studiocinti.eu/userfiles/files/jaliloj.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b63dfc5055e---68514134114.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/93915607585.pdfIn PDF document text
    • http://safarekhoob.ir/basefile/safarekhoobir/files/poxafagafokelinamon.pdfIn PDF document text
    • http://budka39.ru/files/57194445261.pdfIn PDF document text
    • http://sgpeo.pl/users//file/zalofoxorelodusobifizu.pdfIn PDF document text
    • https://studiovizia.com/webroot/img/content/files/bovafoxejafobuwefosoxe.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606eb27b5ce0d---laxuvoxijorapizukedut.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/9p2mli5acnotsmv4e28drk3ko3/bajobutimovamukowixavudin.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160cd2531afd02---kevoporopasimibevade.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3e925e5da6---doruwomorizitasa.pdfIn PDF document text
    • https://ph2020.org/FCKeditor/file/68232650507.pdfIn PDF document text
    • http://orderleesushi.com/uploads/files/53865650579.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/78de8befa72cd8f47e5153319186b591/malegazanufigumusafut.pdfIn PDF document text
    • http://cephedanismani.com/images/pages/file/22045363324.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c65adb87518---pagalaxowekomebolugafa.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/jekojujoj.pdfIn PDF document text
    • http://vuoncotichdep.com/upload/files/35281270981.pdfIn PDF document text
    • http://reszke.pl/fckeditor/editor/filemanager/connectors/php/file/jurakimabegebokamo.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/9pr1cc1u7sa2r7kqqvgik0phc7/49365265911.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160897d6b2ee0f---pamokuxotofiwonitor.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16083621a66e11---tosugotisobewukikokaxi.pdfIn PDF document text
    • https://calendarsunrooms.com/userfiles/files/30947553949.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160f1a2cf0ffbd---79462319405.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=intouch+user+guidePDF 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_off0000c805.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC805 10492 bytes
SHA-256: c8a69baf38d24233941767057202bd3580289b142e8d10804ef56951cc687b82
font_01_sfnt_off0000df9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF9A 17180 bytes
SHA-256: 7ba2dacf819c8d9253f86e49c9d4c0b668cd94be09d7abea3fb94d75c913bbca
font_02_sfnt_off00010cb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CB4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1