Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ba55d8e1b499563…

MALICIOUS

PDF

94.6 KB Created: 2021-06-29 21:01:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2533300c0612d99928d7ba01f1b42c42 SHA-1: ed92a54678bf9d9777a998b12f243b3d34446423 SHA-256: 8ba55d8e1b49956394c036864873b8e1579d41cdf096eec767ac8fbcb6461b6e
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. The file also exhibits characteristics of a link farm, with numerous URLs pointing to potentially compromised WordPress sites, suggesting an attempt to redirect users to malicious content. ClamAV detection and ML classification further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160c226ca80f62---42096692890.pdf In PDF document text
    • http://maezawa-jidousha.com/js/upload/files/16094477311.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/336080301f75adcee4fb12255dd9f928/xosonetogizaroda.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096fef4ed44b---maweguzewadafijijam.pdfIn PDF document text
    • https://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/78803a6fa574707e04415a092258eae9/19942273290.pdfIn PDF document text
    • http://ascensionchina.com/userfiles/file/19514964795.pdfIn PDF document text
    • http://domholidays.com/userfiles/file/wudozipokokotuwob.pdfIn PDF document text
    • http://badischer-kunstverein.de/ckfinder/userfiles/files/5998763407.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160739885b9ca1---kogudiso.pdfIn PDF document text
    • http://shuswapladystriders.ca/userfiles/file/75608846708.pdfIn PDF document text
    • http://kondicionery-dolgoprudny.ru/upload_picture/file/fevedamejutofeziwi.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/13a487d9f09b99098933d3e08699ef20/57223965382.pdfIn PDF document text
    • https://thinkglobalcompliance.com/ckfinder/userfiles/files/zawenolinika.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/daad6252a448e5166b32da8cc1c44685/besorolifona.pdfIn PDF document text
    • https://dynasty888.com/image/files/20210601_024854.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/30a9c7bc6a3e79f4525a7666ef4d8eca/17891566904.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/54144f1b035f7b6abdc47707eb0b1962/5299650508.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d6473caede---voxuleweligepedomote.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160744ab1de5dd---bipojas.pdfIn PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/c34b1efd8698f75593b393988be18782/gafejolotupedi.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608ee5a4baa19---84810545073.pdfIn PDF document text
    • https://www.mii.net/wp-content/plugins/super-forms/uploads/php/files/c4b784d1c3c9c041d50ed3b8002cae35/7213537504.pdfIn PDF document text
    • http://loveforlungs.com/clients/a/a9/a9a80f3a93b7553e0860ec1960497db0/File/bimawijobudijatonujifo.pdfIn PDF document text
    • https://advantagelic.com/singhania/downloads/file/30522066597.pdfIn PDF document text
    • http://mazurubezpieczenia.pl/zdjecia/fck/file/zatoderokuvubirunoxikap.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a8053f67ec9---41842581806.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=rich+snippets+reviewsPDF 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_off00010e82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E82 10340 bytes
SHA-256: 90df2990ba095c417ca567cd60bb55ed4bdfd3e7bb5ba12aaa506a0e1f441eb6
font_01_sfnt_off000125d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125D0 17908 bytes
SHA-256: 2dead3559ef673f5c8051ca493654df3ace80b0971f72f644c34db199d423752
font_02_sfnt_off00015513.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15513 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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