Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9f90c6754059cc9…

MALICIOUS

PDF

81.7 KB Created: 2021-09-10 11:53:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f6e9030646ab8060879739c544f4f2f9 SHA-1: 15d3f8509e0be500f1f72bcab3f4f4b19617c114 SHA-256: e9f90c6754059cc9389bc3848441a134db7d26e32bdfb0fd3184b251c139143d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to multiple compromised websites, likely serving as a lure for phishing or malware distribution. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://crysiq.ru/uplcv?utm_term=c%23+apk+for+android PDF link annotation
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/ret8im66it9udfn071ng5da5a8/wufawafazipoxumifo.pdfIn PDF document text
    • http://apartmany.cucoriedka.sk/data/files/32967656051.pdfIn PDF document text
    • https://qeyeoptical.com/ckeditor/ckfinder/userfiles/files/saraderureset.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/81911872923.pdfIn PDF document text
    • http://oralrem.kz/ckfinder/userfiles/files/negovamivogojukejelejap.pdfIn PDF document text
    • https://nhatngudongkinh.com/upload/ckupload/files/60282608458.pdfIn PDF document text
    • http://stagelight.pl/userfiles/files/zodejugesorebovololugo.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/9ftbkjuld5ni2utreqgg3bjq86/87259214920.pdfIn PDF document text
    • https://adverto.ee/userfiles/file/dajabukalotur.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613abf0a270c9---devareku.pdfIn PDF document text
    • https://ximangcampha.vn/upload/files/xijekep.pdfIn PDF document text
    • http://familiegravesen.dk/ckfinder/userfiles/files/34854670133.pdfIn PDF document text
    • http://cuacuontoanthang.com/media/file/refabapedapufexarazon.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613ae54b62a86---70089344529.pdfIn PDF document text
    • http://ip-golubev.ru/ckfinder/userfiles/files/65333104246.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613877ef68996---vegogukabamenajefej.pdfIn PDF document text
    • http://epoch-making.jp/js/upload/files/83708691372.pdfIn PDF document text
    • https://orangcar.com/app/webroot/upload/files/50801981272.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613808b000d73---71420590849.pdfIn PDF document text
    • https://vibangnhadat.com/uploads/files/fowutu.pdfIn PDF document text
    • http://aotem.com/data/home/qxu1780220113/htdocs/uploadfile/files/5309974018.pdfIn PDF document text
    • http://vagtteam.com/userfiles/Files/vifigafile.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/30acdd0612083db613b56691e24a3e60/gubaxelu.pdfIn PDF document text
    • 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_off0000e10e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE10E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f924.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF924 9104 bytes
SHA-256: fe4a9ad32d6d12da45ce8861a1e6e511df5579fd33367a5c4d1c9e774d301804
font_02_sfnt_off00010bf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BF1 18076 bytes
SHA-256: 522289fddf9c8a1b1723dfacc97e7e70fc91df5c6a98d54336faa4cb4d2990b6

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