Malicious PDF — malware analysis report

Static analysis result for SHA-256 71086748f77bc36f…

MALICIOUS

PDF

91.9 KB Created: 2021-07-08 11:13:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: ab62e0fd497147ca43af94dc190049e5 SHA-1: e6bee1f2eacb5087a685dcb69a2deb9d63d1b758 SHA-256: 71086748f77bc36fa4a53d568a32869b58fd5cf20a0ddd2a75db676065860b46
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution intent. It functions as a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting. The presence of external URIs and link farm heuristics strongly suggests a redirection mechanism to malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://pistant.ru/uplcv?utm_term=lay+on+the+ground PDF link annotation
    • http://ed-web.cz/userfilesfile/kezepadexosilajew.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e02bc6bce35---libugowonuruvut.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160dd64749f649---64360519115.pdfIn PDF document text
    • https://pendekaremas.com/contents//files/23604847083.pdfIn PDF document text
    • http://aj-logistics.com/stock/userfiles/file/gumukagufumuse.pdfIn PDF document text
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/d17f7e923be431f4f84c649687d8494b/dirarasada.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160861f6b5e6c7---13429605163.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/34889919382.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a4f08f2ee85---vadofaginiz.pdfIn PDF document text
    • https://acrgroup.nl/userfiles/file/26899399584.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/2tshu4p594ab0mq3tbjrsa477a/xudiduvon.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/94hid8eo7tbt2s36o58dpl8lnq/xulubiru.pdfIn PDF document text
    • http://fulepmark.hu/nyebu/fulepmark/userfiles/file/vunubifumorodedukuteta.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/83127435058.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/df28e0fd16724408143929ddc08e48b7/nudazavubetuselef.pdfIn PDF document text
    • http://flygarfield.net/userfiles/file/39083397151.pdfIn PDF document text
    • https://majubesar.com/contents//files/fuxunogudelomez.pdfIn PDF document text
    • http://ttmplus.com/userfiles/files/93879332096.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/is1ik6mems7eh90g7a8ul6qilu/rerujuwipiwefakob.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/af9849ce4f7b06ef7a425bed0d5e328e/95135729163.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160b4c2da5b338---xuvetavati.pdfIn PDF document text
    • http://www.lnk-creation.fr/upload/file/tufij.pdfIn PDF document text
    • http://alexanderkanevskyartgallery.com/clientMedia/file/68723297972.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/9837d5683de63dcfcdc60ae89a7c70b0/5794195620.pdfIn PDF document text
    • http://hondasushi.com/uploads/files/romifeminopekab.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/115f5cfaa28e0988ffc282a2837fe41f/6421804306.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_off00010354.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10354 10392 bytes
SHA-256: 584b9c7745444682f2dc93ff02c9f657e3782c6004ec5d2272d0fe08fba9a601
font_01_sfnt_off00011a8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A8F 17856 bytes
SHA-256: e9ef56073f11f4baf02403d4db620b8c305b382d72cf97a12cee9ab6d114283e
font_02_sfnt_off0001493c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1493C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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