Malicious PDF — malware analysis report

Static analysis result for SHA-256 c597e9846600a8f1…

MALICIOUS

PDF

93.9 KB Created: 2021-08-13 09:17:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ff74696ad502f132997a736c3faaa7c8 SHA-1: ac4ee2cfe4b104717075160cc72196d9b3b5961d SHA-256: c597e9846600a8f13a15e47cf853cd78d66beadcc4ecd9be84cf474e45b63b41
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution scheme. The PDF structure and embedded links are consistent with attempts to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://hermanosgolbano.com/admin/fckeditor/editor/filemanager/connectors/phpfile/59329323024.pdf In PDF document text
    • http://hanifeugur.com/image/files/75330028435.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/lugvghdr0ve2epct99g72c06v3/xotojawi.pdfIn PDF document text
    • http://beulahcooleycollection.com/clients/870349/File/vatijepunarobupajo.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/1niore1fpeb22kihp1tmevqn79/bezusobonuxenotor.pdfIn PDF document text
    • https://eqonetech.com/upload/userfiles/files/45740596275.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609eb50dbcda0---jupot.pdfIn PDF document text
    • http://kirilmazbardak.com/userfiles/file/vakubazodofibiw.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160ac0def71742---munitizufad.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/702e50dc0099a3935f079d1a261371e6/xunazosomukepoje.pdfIn PDF document text
    • http://dnepropress.net/files/file/62249860850.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/tewuxaputozawidodut.pdfIn PDF document text
    • http://surmounttravel.com/userfiles/files/4399533156.pdfIn PDF document text
    • https://cecprint.com/images/file/29553766469.pdfIn PDF document text
    • https://www.americansummercamps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608910fc2ffe1---juxofarizit.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/4e55705820d21b87041a6e4fa543c728/rokewuritan.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084599e8211c---lojudanoj.pdfIn PDF document text
    • http://bmcnx.com/userfiles/file/tusemirigenuxuditufojoj.pdfIn PDF document text
    • http://hzyixiangchem.com/upload/files/1017597065.pdfIn PDF document text
    • http://proreferee.ru/uploads/ckfinder/files/tawexijofuliwenipulub.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/b20e4c8631eb33020f3cdea0431d90b0/87683157218.pdfIn PDF document text
    • https://freebcard.com/ckfinder/userfiles/files/jupuvomowerepotufaseso.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/lru4ou2vsg5ub4clp5841fqf01/23332225195.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=what+is+distributive+shock+caused+byPDF 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_off00010c5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C5D 16972 bytes
SHA-256: 4f9073308f5d52e6f8c40994abac69ac776eaef5ac4ad48aced50a68251677a2
font_01_sfnt_off00013853.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13853 10824 bytes
SHA-256: 89d26477e320609da40c8c01868174c33d13b2db3b99b6330303d11d70c84754
font_02_sfnt_off00015189.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15189 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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