Malicious PDF — malware analysis report

Static analysis result for SHA-256 eee4bd906a8b075e…

MALICIOUS

PDF

86.0 KB Created: 2021-09-03 10:51:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 584b33c20434f7f939915dfd5bd0fff3 SHA-1: 302cb1e8308c049c97df43700084b6284428b53a SHA-256: eee4bd906a8b075e701bbb21619f2c975b966e868da915d5c106c0e8bce0697d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised WordPress sites used for hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the structure and URL patterns suggest it functions as a link farm, potentially leading to further malicious content or exploits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://pistant.ru/uplcv?utm_term=greensleeves+pdf+voice PDF link annotation
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c3f92bc8432---25379931825.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16082ba2feef06---jijib.pdfIn PDF document text
    • http://debten.net/UserFiles/File/lulaforirijonupepixim.pdfIn PDF document text
    • http://mjacz.cz/soubory/files/85522351617.pdfIn PDF document text
    • https://blsautomation.com/ckfinder/userfiles/files/82362817597.pdfIn PDF document text
    • https://arichaindia.com/userfiles/file/8691239232.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/nuxapifamesekabop.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16075c337b0f87---46059269646.pdfIn PDF document text
    • https://cape-electronics.com/media/file/wewamaginufifaxe.pdfIn PDF document text
    • http://slsnn.ru/content/file/93361008865.pdfIn PDF document text
    • https://honda-otolongan.com/upload/files/47098000163.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/mqajeqoh198t3dkj3ckkmmfsm1/36985429145.pdfIn PDF document text
    • http://learnazia.com/fck/imagesfile/parewigi.pdfIn PDF document text
    • https://dovolena-jiznicechy.cz/uploads/31202438082.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/160aeb60f08064---zuzizojobazusimerubodofi.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161127bc4dd0dd---15603110819.pdfIn PDF document text
    • https://amitadevnani.com/userfiles/file/pixepeporoso.pdfIn PDF document text
    • https://unicornproduction.gr/wp-content/plugins/super-forms/uploads/php/files/f9c3f200364b65247b126cac8aad7c4a/83269965973.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/c415a2cf87c360db0a792a8b745c9367/98430527316.pdfIn PDF document text
    • http://albertopizzetti.it/userfiles/files/mitebodedekigusu.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/160f1c5cb29671---67727774227.pdfIn PDF document text
    • http://kimandyoo.com/userfiles/file/54689604782.pdfIn PDF document text
    • http://carroll1975.com/clients/4/4e/4e2b018d07aaa5a30c3e4fca1c7a8df7/File/40628078013.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_off0000eabe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEABE 18316 bytes
SHA-256: 74018c4757d899d29ae5a6c36d828be1130b409f7a33123c87d34a17c1e82276
font_01_sfnt_off00011ad1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AD1 10456 bytes
SHA-256: ab146ab4c421288ba4420ce3d761c46adb7848e54d6879271ca99d8c2120e6bf
font_02_sfnt_off000132a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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