Malicious PDF — malware analysis report

Static analysis result for SHA-256 e491d884fa953c5d…

MALICIOUS

PDF

77.2 KB Created: 2021-09-16 09:06:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 844ab77755be58a1f14646b8a597db9f SHA-1: a87c8028ba27333acd24b56492f07eda2d351400 SHA-256: e491d884fa953c5d5886dd457fd64cff42a38cbb253f43bd648a4d8af0f5cd1f
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external websites, some of which are hosted on compromised CMS uploads. The embedded URLs and the nature of the heuristics suggest an attempt to redirect users to malicious or phishing sites, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://cpgny.com/userfiles/files/bobijusokaberesiket.pdf In PDF document text
    • http://micdelhi.in/userfiles/file/denet.pdfIn PDF document text
    • https://cottingham-group.com/cufiles/files/sabirumepuxonajir.pdfIn PDF document text
    • http://thietbianninh188.com/uploads/files/moxijetivupipewujekegufar.pdfIn PDF document text
    • http://noticiascgnews.com.br/ckfinder/userfiles/files/14500957148.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/161347c4c65340---20927963659.pdfIn PDF document text
    • http://hengtaixin.com/HangShun/ckfinder/userfiles/files/24052063761.pdfIn PDF document text
    • https://dongcohonda.com/userfiles/file/zakafoxinojaserunaroz.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16134eebddb935---logifaw.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/kuxuwelikunikugitib.pdfIn PDF document text
    • http://osteriadelcampanile.com/userfiles/files/rifikokuriloviluti.pdfIn PDF document text
    • http://digitalpolicycouncil.org/imagenes/file/28990656661.pdfIn PDF document text
    • https://ddshower.com/ckfinder/userfiles/files/ganudimipofu.pdfIn PDF document text
    • http://conniecorsentino.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fipotijilopetojom.pdfIn PDF document text
    • https://buka.ru/sadm_files/kevoxilepumi.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/amnre54ltrj41bnnnrc7pkvic4/59358599374.pdfIn PDF document text
    • https://powermailer.in/userfiles/file/fotinagukisusiwo.pdfIn PDF document text
    • https://radiosmile.hu/upload/file/11033241457.pdfIn PDF document text
    • https://trungtammatnamviet.vn/upload/files/65981432079.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f449fbdfb6---31440487870.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/77c6976df3a4b1dffa4bff60aca85d08/31920124660.pdfIn PDF document text
    • http://dr-temt.ru/images/file/mawabojemufurewinojixefu.pdfIn PDF document text
    • http://8njl.com/userfiles/files/noranibojomok.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c344aec5ff---janijazan.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/kr0lfbdclad7d8ai789lfk6hc7/kobajagepurovotazukowe.pdfIn PDF document text
    • http://kirche-treuen.de/UserFiles/File/vizetupofiso.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=discrete+mathematics+rosenPDF 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_off0000c9a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9A1 17556 bytes
SHA-256: 59ecf75ad1c1d9c73f36ac91af558ad3c0ab78963176c3a2b60ba9d9d9010b42
font_01_sfnt_off0000f7d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7D0 10452 bytes
SHA-256: e6bb25f37420a7a40d279c4c8a77823609543582c178062c094d03a359aa6283
font_02_sfnt_off00010f60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F60 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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