Malicious PDF — malware analysis report

Static analysis result for SHA-256 62e2d85ed79e02c4…

MALICIOUS

PDF

88.9 KB Created: 2021-08-29 13:18:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 511c1e8c6b77801f2d7160195678795e SHA-1: b171ef977a12036c9e454dc55c610ab2c679ee0a SHA-256: 62e2d85ed79e02c41209ae41e773813d9983d0971edb155fb895d02a2e556739
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting it's designed to redirect users to malicious sites. The document body was unreadable, but the presence of numerous external links and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly indicate a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://mangmalungtea.com/userfiles/file/firaxasemiwa.pdf In PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/b3o2s44lokv0ujgum0b58jrm1v/nakuvofutatupawekaduwew.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/bcd608fccc11695b80a79aa44760546b/gabajoximatezabademibozi.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/8bab3b169eba24d7a8766858d5a92116/12431735975.pdfIn PDF document text
    • http://apvn.info/userfiles/file/12055207452.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089a31a96252---52749826301.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/16072e273c25a4---takamipirolofelog.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/fb68d554c9bddbbe49be08cb37bfa7e1/48354495881.pdfIn PDF document text
    • http://samsung-service-center.ru/uploads/files/raxumiparadopuwogiraj.pdfIn PDF document text
    • http://aisef.org/uploads/userfiles/file/file/42593543902.pdfIn PDF document text
    • https://bdcomunicazione.it/file/50713455106.pdfIn PDF document text
    • http://ahdongjiu.com/upload_fck/file/2021-7-19/20210719081520193608.pdfIn PDF document text
    • http://travisreunion.com/clients/1/1d/1d9c560ef9ee6310b862f4c9d288d7bd/File/43591704617.pdfIn PDF document text
    • http://myhomeinparis.com/userfiles/files/44989516248.pdfIn PDF document text
    • http://nickels.design/ckfinder/userfiles/files/10253864004.pdfIn PDF document text
    • https://vrrc.heart.net.tw/ckfinder/ckfiles/files/41739790507.pdfIn PDF document text
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/f5defa61db59107145269046ea5e8e35/mogikugofipo.pdfIn PDF document text
    • http://kerrya.com/ckfinder/userfiles/files/bularanamisu.pdfIn PDF document text
    • http://keemunblacktea.cn/uploads/file/112205105608.pdfIn PDF document text
    • http://jnafarms.com/clients/864068/File/wefusovi.pdfIn PDF document text
    • http://hvezda-pardubice.cz/files/file/buxiwebevegifawu.pdfIn PDF document text
    • http://tuttotop.com/userfiles/files/kebid.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=ware+me+outPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e0c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0C5 9952 bytes
SHA-256: 72900d02370b4c402dc76a9a2a21175222ab09ddb8a8bab3def83441543d68d2
font_01_sfnt_off0000f6d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010ee6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EE6 1820 bytes
SHA-256: ef4c56b83544acc0eae329b123dcb13384a4443b8ee25b6b011fcec9f25c534c
font_03_sfnt_off0001176c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1176C 24160 bytes
SHA-256: 429b5124f4054c6e2b6732320f23f655f8425ec9dad9f0206ae7f459a83426c5

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