Malicious PDF — malware analysis report

Static analysis result for SHA-256 537d10b5a9162cb5…

MALICIOUS

PDF

82.5 KB Created: 2021-09-06 06:25:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: fab7e1653954dbab70b46ba79a88a8ed SHA-1: e77afd546ddef4b3b7f8f4a99d8a708597c17cdd SHA-256: 537d10b5a9162cb566a77543017238c0aa674f29ee78603df0ee236d2feaecec
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. It also features a link farm pointing to numerous URLs, many hosted on compromised WordPress sites or disposable domains, suggesting an attempt to redirect users to phishing or malware distribution sites. ClamAV detection and ML classification further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://pixomot.ru/uplcv?utm_term=gifted+hands+story+pdf PDF link annotation
    • https://mm-podium.ro/userfiles/file/26324491453.pdfIn PDF document text
    • http://studiofapas.it/userfiles/files/rufatuxegilak.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/5i4gkfguota9amf32rgfficcv5/lidopato.pdfIn PDF document text
    • http://chekeeh.ir/basefile/chekeehir/files/kaworepalagokawevavul.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab59f3b7f46---fadigozijejuzeroxupodaf.pdfIn PDF document text
    • https://angel-juicer.com/FileData/ckfinder/files/20210903_FC4F233EA95AA709.pdfIn PDF document text
    • http://shengnabei.com/uploadfile/file///2021070406464246.pdfIn PDF document text
    • http://toyteepee.com/uploadfiles/file/2105181946427384418h5ams.pdfIn PDF document text
    • http://bmsorganica.com/userfiles/file/10070571527.pdfIn PDF document text
    • http://pphjako.pl/userfiles/file/59397776485.pdfIn PDF document text
    • http://longarmacademy.net/fckeditor/userfiles/file/78597157266.pdfIn PDF document text
    • https://motiv8workout.com/up/files/talutodil.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/43038650534.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9a27a0a0b8---zibip.pdfIn PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/a25473881ad6293f6eb98718e9c50bc6/dulutezerewijaravude.pdfIn PDF document text
    • http://qiangka.com/ckfinder/userfiles/files/58983373714.pdfIn PDF document text
    • http://www.pilonidalsinus.gen.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8f21d1090---logulawabozefogegiruvubaw.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/c3acba4055ba4c7ee6ff10822676af3c/34256866999.pdfIn PDF document text
    • http://gunjanjain.com/app/webroot/js/uploads/files/xemawu.pdfIn PDF document text
    • http://seattleteriyaki3.com/uploads/files/pagizolunotudutusugoro.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086b56a10ff0---tupedivulobabowatujik.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dce2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCE2 10704 bytes
SHA-256: 0cf2b78229994b95fb3fbeee3479854fba22f5e4f9b355b7f821a4d0873ab398
font_01_sfnt_off0000f576.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF576 18132 bytes
SHA-256: addf0af2312388da94ef34692931345595d4ebd196aeec99a98d8a4ab6d818c8
font_02_sfnt_off000124c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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