Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ce2e5be6bead219…

MALICIOUS

PDF

69.9 KB Created: 2021-09-24 14:45:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7163ec704b984f17464cca56dc435fc2 SHA-1: a2b565f34b3fe7e674765b1c8c1d0e8bfe96407c SHA-256: 1ce2e5be6bead219b2ffaee47a826ad0b57c0bd40b6eb6652c174c3cf3b06694
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous URLs pointing to various domains, many of which appear to be compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://laborke.ru/uplcv?utm_term=chispa+app+descargar+gratis PDF link annotation
    • https://responsible-tourism-alliance.com/content_file/files/jaxurabilasutu.pdfIn PDF document text
    • http://techmechengineers.com/uploads/71047399191.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/161432b8e25470---9562990426.pdfIn PDF document text
    • https://bruceautoservice.com/files/file/58976009271.pdfIn PDF document text
    • http://niezapominajkowo.eu/userfiles/file/dukemukubum.pdfIn PDF document text
    • http://world-spa-resorts.com/dok/zitefujete.pdfIn PDF document text
    • http://satunatc.ac.th/ckfinder/userfiles/files/36151686792.pdfIn PDF document text
    • https://vanchuyenduongsat.vn/upload/files/katoraxukureluxidoxavon.pdfIn PDF document text
    • http://majortaylorride.info/images/uploaded/file/dozexizisegebobi.pdfIn PDF document text
    • http://www.dogwoodagility.nl/ckfinder/userfiles/files/83677141441.pdfIn PDF document text
    • https://glycocalyx.nl/userfiles/image/file/71261600523.pdfIn PDF document text
    • http://futureinfashion.com/ckfinder/userfiles/files/zarixobajutuzeduzuledap.pdfIn PDF document text
    • https://myparrotfood.com/user_files/files/fosebunonupeso.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/hbp3fokooqefspggiii5pj94ec/6912108860.pdfIn PDF document text
    • http://md-servicios.com/userfiles/file/13929972818.pdfIn PDF document text
    • http://nataliashishkina.com/userfiles/file/18567305348.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/67168962400.pdfIn PDF document text
    • https://quatcongnghieput.com/uploads/files/zufadoribigutisejigikos.pdfIn PDF document text
    • http://red-persimmons.com/upfiles/editor/files/bakaluwivitufim.pdfIn PDF document text
    • https://dalycity.com/wysiwygfiles/file/xotanaponufoliwerarulolu.pdfIn PDF document text
    • https://paysecure.ro/ckfinder/userfiles/files/53187780036.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614438f767ee0---35039906235.pdfIn PDF document text
    • http://celyroknaterase.sk/editor_uploads/system/files/dememoridalaratalod.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_off0000b10b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB10B 16216 bytes
SHA-256: f9d7acd7dfb040f5d959453a02d29958fef7cef5d53d01737b642653f502c11c
font_01_sfnt_off0000da10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA10 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f227.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF227 10556 bytes
SHA-256: 39394dd988f60d93d2310107b38bd9477639c94ccab659b3b342ef3a712d4773

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