Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0a2f53008c0b370…

MALICIOUS

PDF

92.3 KB Created: 2021-06-29 14:24:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 99612bbf1adb474bf0c2b229a23fbab2 SHA-1: 51f31c2290666ac00d5e02480d4aee8676212a3f SHA-256: a0a2f53008c0b370dad94dda24f2a30bf5681060a70503a204180ba65d95932b
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs and links to compromised CMS uploads, suggesting it's designed to lead users to malicious websites. The document's structure indicates it functions as a link farm, likely to distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://queure.ru/uplcv?utm_term=richard+wright+the+ethics+of+living+jim+crow PDF link annotation
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/b1e13ebf3738efe89dd84f4213f30388/voladowexabixanokujinopos.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094a2906a673---zarawajowudovubi.pdfIn PDF document text
    • http://funperm.ru/content/file/fuzanaxegezovofer.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/qdk0n5no1smqfu4t407a4ef9u3/sokevumumiv.pdfIn PDF document text
    • https://www.nrlandscapes.co.uk/wp-content/plugins/super-forms/uploads/php/files/02e15b513544a17e2e1e31123cb0884f/33868638105.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/17803804208.pdfIn PDF document text
    • https://personnelcle.com/userfiles/file/52511857711.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/ad5c79ol0hssag846508um6c57/motufuzimon.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16080373ce89e3---dubezepokosatedejetizeka.pdfIn PDF document text
    • http://gld-lining.com/user_img/files/zovifiwi.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/585af9c8ccc71239ac767431764e9a01/laraf.pdfIn PDF document text
    • http://cambridgekapurthala.com/damana/userfiles/file/74045104920.pdfIn PDF document text
    • http://www.bandungmesin.com/file/75669698822.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/u781l01pc92fm2394jccs9kqb7/ziwonulesamowurapazoxab.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081aa6c1817f---zabijugupakonorigu.pdfIn PDF document text
    • https://etre-cheval.fr/Applications/MAMP/htdocs/etre%20cheval/news_pix/file/pezajadog.pdfIn PDF document text
    • http://rotarylaspalmas.org/documentos/file/rofuzumepogifolavibejo.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/999101a2aabe4a5aaedc2cb17da955e0/33486850404.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607df08210caa---76517672882.pdfIn PDF document text
    • http://www.microsinusectomi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080328badab5---baturarabulemojo.pdfIn PDF document text
    • http://thetuckerfamilyreunion.com/clients/67950/File/23611958906.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/luseluxerazika.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/q6unethpalkbn1k1mca6jgeja3/63658723160.pdfIn PDF document text
    • https://coil.hk/upload/files/lesemibosokubumu.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_off00010851.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10851 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012068.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12068 11248 bytes
SHA-256: 8b8e3e040bff73de8c86c5c3b77c509f7738212784b9fa8c06a9a0441b641eeb
font_02_sfnt_off00013a6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A6D 16080 bytes
SHA-256: 19128612fa228b9b381a940f81fa899c1fd30063875ae820f68441e81f8b7aac