Malicious PDF — malware analysis report

Static analysis result for SHA-256 591e06524ff06f0c…

MALICIOUS

PDF

77.9 KB Created: 2021-08-14 18:47:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 17241abf4312fb76fd567f32761e42d0 SHA-1: bf66bbc4f52edc7ca8393e431bd5bd2de8e22fdc SHA-256: 591e06524ff06f0cca55581fe2d73544d2b2578881d28b68b81acab5445b8f32
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs that point to compromised WordPress sites, likely serving as a distribution point for further malicious content. The presence of multiple external URIs and link farm heuristics strongly suggests a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/mfklmkv8m72jjtm5omt5o00es0/95043140324.pdf In PDF document text
    • http://hanhthien.net/uploads/file/toxajuxewulenagumupobeved.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078ae57164c5---kemifepemigavas.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/c9521eb0c1fe4fab0166ebf6778584b4/dedawaxaji.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/ff2795d58d00dd247ba6d3ce941f9684/43614924594.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a832e74b9c3---96603542216.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/1610f37003e110---67213108035.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/35a5ddc72524fb58af1ac1aa8728e4ee/jemidofowamibolupeg.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/cd8f500e6b025ba78655b8be7bcd97d4/jufukowulaki.pdfIn PDF document text
    • http://stressmanagement-karriere.de/userfiles/file/wanovorazut.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/160846315d66cd---gizupafadok.pdfIn PDF document text
    • http://nomorecpapmachine.com/userfiles/files/86376741653.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/ge4mfifuq5n1ju3n0539g6j8g5/xeketone.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160913e5365598---ruxudeginuwurenugelifa.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/te00qdugpo1kaghqu5rsfacn7o/kamutopanonaja.pdfIn PDF document text
    • https://edu-mate.kr/_UploadFile/Images/file/63325022902.pdfIn PDF document text
    • https://itacademyindia.com/ckfinder/userfiles/files/gebilikuvoxewexebiv.pdfIn PDF document text
    • http://chiengthai.com/file_media/file_image/file/namanukixe.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160804e0c021d0---14857961716.pdfIn PDF document text
    • https://jurad.eu/files/file/20769561088.pdfIn PDF document text
    • http://cn-biyoute.com/d/files/tiwiregijixerexabune.pdfIn PDF document text
    • http://duocmyphamcongty.com/app/webroot/uploads/files/wufadel.pdfIn PDF document text
    • https://asset-books.com/userfiles/file/13677339557.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=a+photographic+atlas+for+anatomy+%26+physiology+herbert+pdfPDF 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_off0000cb70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB70 10892 bytes
SHA-256: 9642d8b096fb3ca204c3ffbcb0c0ac79ba8eb3ddc6020f69fe75178cce20fdae
font_01_sfnt_off0000e47d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE47D 17304 bytes
SHA-256: 7592de8fb92daee344b11666ef3e5b038af8ab4858f32afa2f874595675bde94
font_02_sfnt_off000111d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1