Malicious PDF — malware analysis report

Static analysis result for SHA-256 87eb91f109263817…

MALICIOUS

PDF

84.8 KB Created: 2021-09-05 23:20:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: db6044d3e99c36e769ab846f6b3951a4 SHA-1: 9bf5b06a9056ba051e8caed474bbf84e8298c076 SHA-256: 87eb91f1092638171d1a18436d7fd638f76ea03172bdadd7daa31f7b011add48
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to compromised websites, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest this PDF is malicious, likely serving as a lure for phishing or malware downloads. The presence of multiple distinct hosts hosting PDFs further supports this conclusion.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/2uue8f90uqrij83tndp1h6lgn0/lilonerirupidekuponuk.pdf In PDF document text
    • http://ezclasssites.com/var/wwww/dev-ezclasssites-com/data/files/86187904586.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/df80620011ab34c6aaf7ca718927fe31/dozowawipowelixujusor.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2f230da59---60852321888.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160784ef60c36a---91755596499.pdfIn PDF document text
    • http://phyllisrubensteinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/furasaruxupisesabuken.pdfIn PDF document text
    • https://mebelihome.ru/upload_picture/wekopetesusajax.pdfIn PDF document text
    • http://minniemleefamilyreunion.com/clients/4/46/4626b253669c69ed517e077132fb6553/File/76203266915.pdfIn PDF document text
    • https://slezanie.eu/userfiles/file/vuviboxovapadigam.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/2f00cc5ebf079a210638cde1042e4a4b/86499361332.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160efdd853b0e4---xuxerusutiwawezapaf.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/e61e4f1b7f69fa1094a3a53180016ae7/24782829513.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/f96f8dfeb45e303a0064d34aca22e9de/14464383254.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/349856680cc648273674474c2ffe2f25/66281454383.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d077fe7874b---sivudaxapufikuduvum.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160886837aad96---34443369381.pdfIn PDF document text
    • http://haustechnik-hagenauer.at/gelalipololewetap.pdfIn PDF document text
    • https://pepinieramontana.ro/ckfinder/userfiles/files/49740943815.pdfIn PDF document text
    • http://muntepa.com/userfiles/files/kibenuki.pdfIn PDF document text
    • http://www.giuseppe.ru/ckfinder/userfiles/files/80809533667.pdfIn PDF document text
    • http://parvazyab.net/basefile/api203/files/rumokazed.pdfIn PDF document text
    • http://resheto.ru/users_images//fck/file/vanizeb.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16106a5f79b3a7---kedixumefuxit.pdfIn PDF document text
    • http://vitali-schulz-eiskunstlaufen.de/userfiles/files/39012950662.pdfIn PDF document text
    • http://mirai-kankyo.com/userfiles/files/pitudikikelow.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/no9o92d63j0d9nunejgs7gu91l/24753723880.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1606f408311d21---35641516540.pdfIn PDF document text
    • https://mimpishio2bet.net/contents//files/35081217616.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=la+luz+es+como+el+agua+pdf+gabriel+garcia+marquezPDF 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_off0000e397.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE397 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fba9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBA9 18568 bytes
SHA-256: 6414196d3b499a65242515dc39330e63ba061d832f4e8b10d05bfb8bd251a375
font_02_sfnt_off00012b2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B2A 11164 bytes
SHA-256: 4cd403fb0db76ec226bbd54384666093178ae1a9531b175d6331439df38ffddf