Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b163dd297c3b828…

MALICIOUS

PDF

86.6 KB Created: 2021-07-05 18:46:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 3f0ba1baf1bed38e54c79690177b9d4a SHA-1: 597827560e948ca6354b02d74ffe38435933c947 SHA-256: 5b163dd297c3b82865d5e08c07c8ec569efb682ec2c6aa5a3728a11735d5753c
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS upload directories, suggesting it's designed to lead users to malicious content. The document body is heavily obfuscated and unreadable, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://synersys.fr/contenu/file/49578819769.pdf In PDF document text
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/q61o8sue8etf5h3v6kdignqgk0/nunoma.pdfIn PDF document text
    • https://toromecanicorodeo.com/files/64967962543.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/13bce7d5da18b477f9ad826cf976588f/29818102445.pdfIn PDF document text
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/6d26ede01ea8bffc3031956a2e49bdc7/diwafikokokebaxu.pdfIn PDF document text
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160998e4c72ae4---6686059746.pdfIn PDF document text
    • https://anfauglir.com/images/file/ketolof.pdfIn PDF document text
    • http://kantoromega.pl/userfiles/file/bumamomimof.pdfIn PDF document text
    • http://aep-tc.com/cache/fck_files/file/jorisetigedagegel.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/35a09eabcc81e7b6733160c80b132b42/37545100445.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8ed16f2f4a9f202d6dde0fd4f26ff567/natugovexijekobe.pdfIn PDF document text
    • http://sakem.org/userfiles/files/51120761325.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083094973b55---49029724919.pdfIn PDF document text
    • http://waukeganeast1980.com/clients/877304/File/zelobodifowozobelumadit.pdfIn PDF document text
    • https://amatnieks.lv/pictures/image/45160200029.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608471c3e4fd3---26693786502.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/ec8a6a550224e9acbdcf613490633d6c/68516095948.pdfIn PDF document text
    • http://billedbutikken.dk/articlefiles/file/26832620632.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e5612ed4b3---82015486058.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16076aea22ba6e---pokaraverorazuworidivo.pdfIn PDF document text
    • http://chronicles.ae/userfiles/files/22110100289.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=time+out+programPDF 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_off0000f087.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF087 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010899.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10899 17276 bytes
SHA-256: eb8ccb03e9640d2b6f5afa07c319e7bf3b7acf0c57787a51138cc14b61e1d59a
font_02_sfnt_off000135f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135F9 10340 bytes
SHA-256: 062fbe77940b939b3fda4088c6a3f9bb32b26e706c1c590e4419ccfcb2a7ec5a

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