Malicious PDF — malware analysis report

Static analysis result for SHA-256 818324e379dae7bb…

MALICIOUS

PDF

111.3 KB Created: 2021-06-30 10:56:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 85718c98c0116f0021bd8e8d78262c10 SHA-1: 71309ba991da2c718c8c8fd592b07d6b583ca8cf SHA-256: 818324e379dae7bbe98e26418febbde56622e1dce83ebd06a3e054aea9c976e3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ClamAV as 'Pdf.Phishing.Trojan' and the ML classifier also indicated maliciousness. The document contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute further malicious content or conduct phishing. No scripts were extracted, but the presence of numerous external links on compromised domains indicates a likely phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9885

Heuristics 6

  • 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.
  • 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://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/1608aa242e0a5f---82914970981.pdf In PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/95a7436069007af248f2f96b1ad9a8e3/vonefapozer.pdfIn PDF document text
    • http://verynailscm.com/user_img/file/60099463865.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/ian4qeidopbrp0qk6o8chr3307/1140536597.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/cq5va78b2c7v9gqjq7kvjh75oa/zekuxutegatab.pdfIn PDF document text
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/nkbq4lnnag52f03rnfabgjah8g/dekejasa.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160714458b38cc---redapejakuxewosejaxib.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/b8e03b47b0466aa653eed4ef7d51c173/fipufona.pdfIn PDF document text
    • http://chanakyaaerospacedefence.com/userfiles/file/58474362088.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16071007da6ed0---43981560296.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1d84a995a009f1c9fe826fa2dd2ce968/fevizonorufuropefepowaniw.pdfIn PDF document text
    • http://nordicaluminium.ru/userfiles/file/78055830129.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160995fc931666---5634531252.pdfIn PDF document text
    • http://clubselectionvoyages.com/images/file/rimas.pdfIn PDF document text
    • http://intelekt.biz/uploads/pages/files/wuguwavu.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e2c29aa46e---98508274228.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/b84b29cc3df74d82fb7c9b56dc4a2f64/89605412234.pdfIn PDF document text
    • http://lueckerreunion2020.com/clients/e/eb/eba09433058400eda594a485f9004317/File/peropibopiguvifada.pdfIn PDF document text
    • http://dragonspond.com/uploads/files/jarubej.pdfIn PDF document text
    • http://www.elitagida.com.tr/wp-content/plugins/super-forms/uploads/php/files/1rjs3tqqg73609l7lgug6cphk1/62278138373.pdfIn PDF document text
    • http://studioriggio.it/userfiles/files/85857714014.pdfIn PDF document text
    • https://acronimocostanzo.com/userfiles/file/jomole.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/14330f04a817c50582db79b26131479f/wogewumokukef.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=minecraft+tinkers+construct+casting+channelPDF 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_off0000fad1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAD1 10800 bytes
SHA-256: 3f4f038c01248ee83b64ba5806f203b9d7fedd1baa85161b018049fee1a4c612
font_01_sfnt_off000113b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012bbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BBF 31964 bytes
SHA-256: a751dae1ad04849fb92871f71c4910b50823d3992059ba982e8d68b9392bda92
font_03_sfnt_off0001830d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1830D 16904 bytes
SHA-256: 4ab6a01c6be2efc90956530a0caa8a84cda5aea04cfb2ff5d9e5b9489403f5ce

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