Malicious PDF — malware analysis report

Static analysis result for SHA-256 30e7f05f5a8815b0…

MALICIOUS

PDF

84.1 KB Created: 2021-09-20 21:00:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: cfc6241763a5db4a962096890a6ed02a SHA-1: 4263c7dc2dda68abcaf326ec64d5c154cd7b99b0 SHA-256: 30e7f05f5a8815b0924025707b0af4bdb71535591eb850619e6eccb4c8024cf2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress upload storage locations and other disposable hosting sites. The presence of 'utm_term' parameters suggests an attempt to track user engagement with these lures, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://irlanc.ru/uplcv?utm_term=mono+bluetooth+router+app PDF link annotation
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612f0716aaa16---70712827523.pdfIn PDF document text
    • http://brmxn.com/userfiles/file/20210908115112_sd4vd0.pdfIn PDF document text
    • http://autolubitel-irk.ru/userfiles/file/wetaxemagaxapesadule.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/lq47534ha7ukat733ujk3qtdn7/rujamube.pdfIn PDF document text
    • http://astprom.ru/sites/default/files/file/26416182123.pdfIn PDF document text
    • https://bczenekar.hu/files/file/26384219393.pdfIn PDF document text
    • https://zlataraburmevuckovic.com/files/mekefuwatimilir.pdfIn PDF document text
    • http://eastendmediation.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/50369778890.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16130940c721b2---30024627575.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/zurejapivejavozu.pdfIn PDF document text
    • http://cesishotel.com/res/wysiwyg/file/bewezore.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/b962617be26df97a8e7109dc14d06172/80889485504.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161477e6b85f21---3967525666.pdfIn PDF document text
    • http://geriatriccarenewjersey.com/userfiles/files/71426214639.pdfIn PDF document text
    • https://rachelrom.com/rescontent/file/rewefikifilarusap.pdfIn PDF document text
    • https://vibingvibes.com/userfiles/files/34995916012.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614016b675a0a---vufanitosugakobem.pdfIn PDF document text
    • http://xn--80aafkatcapceshpicpg3h.xn--p1ai/pict/file/26562369134.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143343c000bf---lomizuwajebabavoroxat.pdfIn PDF document text
    • http://webspace.mysdam.net/images/newsletter/files/89075810830.pdfIn PDF document text
    • https://weborder.cloud/userfiles/file///lusovamakosutedisusewedo.pdfIn PDF document text
    • https://dmitrovka-zn.ru/admin/ckfinder/userfiles/files/puvekirobodixo.pdfIn PDF document text
    • http://gibisch.info/files/files/57228105749.pdfIn PDF document text
    • http://xinge168.com/uploads/files/20210901120451_406705.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_off0000e4d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4D1 10324 bytes
SHA-256: 48d65d1d09f41cecaa9c7b6af58c5e4599cd35b7488afd3d68ee658457b0a4d2
font_01_sfnt_off0000fbca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBCA 17876 bytes
SHA-256: afa645197db3e439620ea5a0663996cdb5e632d3eddb3d5d11ceb42c59e5ff88
font_02_sfnt_off00012a45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A45 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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