Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9c0c2ca69249678…

MALICIOUS

PDF

83.3 KB Created: 2021-09-24 04:50:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c6deebdba63dd7e5cf09500a75def4a7 SHA-1: 331e0e8a3a8bc6b3e2442efb5472f15ec438978f SHA-256: c9c0c2ca69249678be434f51fda7020dfcd3f438b2dc202b68e90aa1cf6ff1fc
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and numerous links to potentially compromised or disposable hosting sites suggests an attempt to redirect users to malicious content or download further payloads. The PDF structure itself appears to be a link farm designed to obscure the true destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://tomei4x4.jp/js/upload/files/20725495541.pdf In PDF document text
    • http://medrea.ru/upload/files/zejiwujotijo.pdfIn PDF document text
    • http://vipacademy.org/userfiles/file/48421471439.pdfIn PDF document text
    • https://www.adom.biz.pl/ckfinder/userfiles/files/nevaw.pdfIn PDF document text
    • http://kuryakyn.ru/userfiles/file/81091784756.pdfIn PDF document text
    • https://zemiigori.com/uploads/file/98821342558.pdfIn PDF document text
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/fevidejewowevivomewimavif.pdfIn PDF document text
    • https://ukmriptek.org/codeIgniter-hmvc/userfiles/files/vojuzikiwowafokomu.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16147bf0ebacd4---demebefofatuke.pdfIn PDF document text
    • http://mskabel.cz/UserFiles/File/xovavoxezikuwabosi.pdfIn PDF document text
    • https://lazdynumokykla.lt/userfiles/file/mebovexuwozuvamef.pdfIn PDF document text
    • http://orem.mn/uploads/files/4818238627.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/16142cff4920bb---nogowuninexidugilufobi.pdfIn PDF document text
    • http://ibrahimabuomira.com/ckeditor/ckfinder/userfiles/files/judofugojanebazaludiv.pdfIn PDF document text
    • https://www.hotelrestaurantmacarena.fr/ckfinder/userfiles/files/tudabisopazosukob.pdfIn PDF document text
    • http://gonvvama.net/filespath/files/20210923030843.pdfIn PDF document text
    • http://erodiertechnik-wenzel.de/userfiles/file/70980123165.pdfIn PDF document text
    • http://888chji.com/userfiles/files/6821713082.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/7594553535.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/37t1t326uq8va5b2b432ik2s3r/rezuxavanubumubobimep.pdfIn PDF document text
    • http://squash-fitness.cz/userfiles/file/87190481901.pdfIn PDF document text
    • https://infiniteprospects.com/FCKeditor/file/78190799107.pdfIn PDF document text
    • http://cementfeet.com/userfiles/file/52841330482.pdfIn PDF document text
    • https://foursservices.com/nbloom/fckuploads/file/jozakokabidibexekivoziru.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=python+opencv+androidPDF 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_off0000e19c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE19C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f9b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9B3 10580 bytes
SHA-256: a837d334928f1db845c72b0da73c34b1d8caa018ff03ec62884e0a6d852fe937
font_02_sfnt_off000111d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111D5 17456 bytes
SHA-256: e974c4722bb88e009700ecdff4b412ece43d77aa738cb90017b2daa3fc024d95

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