Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebb97ead3e64dd79…

MALICIOUS

PDF

75.3 KB Created: 2021-10-03 14:18:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 72cafa871c6d9684c7b9d279fb1db853 SHA-1: 1bba9ff4a0517d4da28f2d4d06fd367dde031fc5 SHA-256: ebb97ead3e64dd7977cd3322a2cc33a167a1568f698d6900b7904cabd9b623ae
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The file's structure and URL patterns are consistent with a spearphishing attachment used to lure victims to malicious content.

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 https://ww150006.linebot.net/upfile/files/20210917202649.pdf In PDF document text
    • http://stolizstekla.ru/userfiles/file/lebajid.pdfIn PDF document text
    • http://ehomeforeclosure.org/images/file/kuxibunofip.pdfIn PDF document text
    • https://xnkvinatimex.com/uploads/files/47065545659.pdfIn PDF document text
    • https://szaniterplaza.hu/ckfinder/userfiles/files/6477667038.pdfIn PDF document text
    • http://unionasset.net/file_upload/spaw_upload/file/20211003015152.pdfIn PDF document text
    • http://think6.net/ckfinder/userfiles/files/20210912020402.pdfIn PDF document text
    • http://salondebellezaanamariaromero.es/ckfinder/userfiles/files/redimobisezovawomaz.pdfIn PDF document text
    • http://ukkies.be/userfiles/file/zigukepuse.pdfIn PDF document text
    • https://metrosecuritynepal.com/assets/userfiles/files/ruzogafajifum.pdfIn PDF document text
    • https://www.wizzfizz.com.au/application/third_party/ckfinder/userfiles/files/rusazovameko.pdfIn PDF document text
    • http://www.anglometais.com.br/adm/Editor/ckfinder/userfiles/files/43398419118.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161454491b3660---dajotuzivuze.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/16139182bd04ef---21184065546.pdfIn PDF document text
    • https://investmentskillsgroup.com/images/userfiles/file/27484307279.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/18c5cc42a89ae459bd4ba607695b77c8/kuronejiveviwipa.pdfIn PDF document text
    • https://www.nitm.ac.in/nitmeghalaya/ckfinder/userfiles/files/70117204503.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/pngckfptctj65k8sibvs7a698g/20276562426.pdfIn PDF document text
    • https://thebottombillion.org/business_school/uploads/file/gadizumexevuvasamipozi.pdfIn PDF document text
    • https://apc-algercentre.dz/ckfinder/userfiles/files/50084264980.pdfIn PDF document text
    • http://straub-online.ch/userfiles/files/sifurubifebi.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/c2d791cedaf8f6a4498eb5ff73ab6999/nowowefari.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613388a9df3d1---gegaxejalabib.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=mary+kate+andPDF 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_off0000bcd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCD4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d4e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4E6 19996 bytes
SHA-256: cb2b628e1086443ba84972c3a4456fd125c8190befb7cdc1f1f3c8a89e6d211f
font_02_sfnt_off0001095c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1095C 10012 bytes
SHA-256: 0d77ed203e240e61742fe095bf6d680fa25d912dfda2bef4af0732f9db3a74c5