Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb543d5f87dd6d18…

MALICIOUS

PDF

93.1 KB Created: 2021-09-05 20:18:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0bc923678f25fbd75e617e4dd38d493e SHA-1: fa56dcb633ceebc025a527f81221591706c2253c SHA-256: bb543d5f87dd6d182d1eb61084883c9e62474b002f1d8cf818835998ea081c71
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to potentially compromised WordPress sites and other domains, suggesting an attempt to redirect users to malicious content or phishing pages. The presence of multiple external URIs and link farm heuristics strongly supports a phishing or credential harvesting attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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 http://citra.cl/userfiles/file/pisev.pdf In PDF document text
    • https://infoenergie-loire.org/userfiles/file/7024253580.pdfIn PDF document text
    • http://heyumpnd.com/userfiles/file///17637748355.pdfIn PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607d6b453481b---pamewenesipusarovimobeg.pdfIn PDF document text
    • http://wxdyzs.com/userfiles/files/dajowifazagolowixakow.pdfIn PDF document text
    • https://kurashi-kyoiku.com/cms/dat/upimg/file/36119206276.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160783e84ee0bc---noromajuzoje.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609492eaa6171---gedepulumifajirib.pdfIn PDF document text
    • http://smiletoursvietnam.com/ckfinder/userfiles/files/kimeliwajukitewiwu.pdfIn PDF document text
    • http://veszpremlizards.hu/_user/file/2819754742.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/bapojojagilajojusukutide.pdfIn PDF document text
    • http://ahzycw.com/upload_fck/file/2021-8-26/20210826093402842375.pdfIn PDF document text
    • http://shipagents.nl/uploadfiles/file/80215978229.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/muvonimewibobomometapekon.pdfIn PDF document text
    • http://kangshi-you.com/uploads/files/202108252108027498.pdfIn PDF document text
    • http://thessalonikiflights.com/files/files/riroxet.pdfIn PDF document text
    • http://asahiru-ban.com/files/files/xavax.pdfIn PDF document text
    • http://chichen.asia/ckfinder/userfiles/files/93768443256.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdb3ad5ffc7---katowefixukojoxox.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/jhg55oq06n90lpdfcupe6p07a5/88626737215.pdfIn PDF document text
    • https://homeuu.biz/upload/ckeditor/pages//files/zuposukifubib.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/192f5c5cd7ab225ad4a5abad330ed974/lemagomoketujer.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/dabibuloziline.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613273363bca2---30367732354.pdfIn PDF document text
    • https://lalicorne-hotel.com/userfiles/file/98518163740.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc551468a0c---gululepobuwala.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=mcdougal+littell+algebra+2+pdf+answersPDF link annotation
    • 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_off00010519.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10519 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011d30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D30 11232 bytes
SHA-256: a539287d6a75713f6b21e781dd67d4552a9db12af3b04b44c6646e1d84dbde30
font_02_sfnt_off00013758.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13758 17776 bytes
SHA-256: 4824ee64c56986ec6ac000ad0d0de59004985ce66999cbaf093306496190a9ca

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