Malicious PDF — malware analysis report

Static analysis result for SHA-256 7275015cb7158c4b…

MALICIOUS

PDF

95.5 KB Created: 2021-09-05 01:38:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: d202d9941fcb71b77e012705be84f53d SHA-1: 63f123cd1fa0cce8f7483af615898f95001dedca SHA-256: 7275015cb7158c4b79d5c334ab00b1f48d2c0eed060d4fa1e1e48c7b03aaffaf
164 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 and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9918

Heuristics 7

  • 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.
  • 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 http://penzionnakrizankach.cz/ckfinder/userfiles/files/88860918927.pdf In PDF document text
    • https://charteriraq.ir/basefile/charteriraqir/files/92481277922.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607d03fe490b3---8691207747.pdfIn PDF document text
    • http://interwork.sk/userfiles/file/nizuvuwelafov.pdfIn PDF document text
    • http://seednseed.com/admin/fckfiles/file/rewapadajikux.pdfIn PDF document text
    • https://angkoronetour.com/userfiles/file/kutemapikeruxar.pdfIn PDF document text
    • http://leinerpakgelatine.com/survey/userfiles/files/53953799894.pdfIn PDF document text
    • http://srihemkuntsahibfgp.org/hemkunt/userfiles/file/93066630944.pdfIn PDF document text
    • http://abpaluso.com/upload/file/zimijazo.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c73a6ba09e---tenopamajubamewulaz.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091b7a5e96e6---vivilelinel.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/160fc7df0bf4b4---72866587601.pdfIn PDF document text
    • http://zoop-tech.com/ckfinder/userfiles/files/ginenal.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/pawudotogavepijezezugekit.pdfIn PDF document text
    • https://xn----7sbbjg7ctfs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/49f0a715d22d93e1bcc0f164f5c0c38b/49044955933.pdfIn PDF document text
    • http://antonio-pelella.eu/userfiles/files/15113659519.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/cf2c17fb65c73b8ac707ffcc3288b1dd/53590709319.pdfIn PDF document text
    • http://scoutpate.com/userfiles/file/34806572569.pdfIn PDF document text
    • http://1137.jp/app/webroot/js/ckfinder/userfiles/files/50965880843.pdfIn PDF document text
    • http://thermogroup.ru/uploads/files/kinitam.pdfIn PDF document text
    • http://massvt.sk/editor_uploads/system/files/zifapebiwatubodeg.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160f4221df0a76---34026288557.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608ca6be4275a---gugiwiwonodax.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7775f25c02---19873795133.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=pdf+reader+windows+xp+service+pack+2PDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED1D 23252 bytes
SHA-256: 9ef33e8d4d51c552c2fd5630d9ae1860f9b3b9bd3ee3c0c869121ab4a142b1e2
font_01_sfnt_off000128e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128E0 16080 bytes
SHA-256: 6ec0a307146d9be2bdd9dd9a35227856c774c3cce985d3f038f6c9b4f02e256a
font_02_sfnt_off00013e14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E14 10936 bytes
SHA-256: dd66ad5f675b8a8d47316df704036e38befb6df7fb5f1e2f2d7fcc62bef944f2
font_03_sfnt_off000157b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x157B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1