Malicious PDF — malware analysis report

Static analysis result for SHA-256 6744c1e6405d332d…

MALICIOUS

PDF

82.1 KB Created: 2021-09-22 10:15:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3ff636b262f9a31d9c7b10eba8e6dde6 SHA-1: b4d714537f853148a4b8291ceae5c882ff57e5f3 SHA-256: 6744c1e6405d332d71c2517b20cd53b9edcb6f0370d25e6405c7093a296146e9
164 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised WordPress uploads or disposable domains, suggesting a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL findings are sufficient to infer a malicious workflow.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://queure.ru/uplcv?utm_term=top+5+best+cleaner+for+android PDF link annotation
    • http://jiuxingchaoshi.com/uploads/file/041911533872.pdfIn PDF document text
    • http://sportsclinicwest.ie/media/contents/file/71466670878.pdfIn PDF document text
    • http://skpizzasubs.com/uploads/files/45567454082.pdfIn PDF document text
    • https://somos.co/dleyes/admin/fotos/file/ruxujadidigabud.pdfIn PDF document text
    • https://guanlai.tw/uploads/files/202109160916311014.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/8cac227e90f29438067c95fd442e4567/tagixugorov.pdfIn PDF document text
    • http://quranday.org/userfiles/file/xoxafuzatekaxanonifa.pdfIn PDF document text
    • http://britishcytology.org.uk/ckfinder/userfiles/files/60117308804.pdfIn PDF document text
    • https://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/sexikuduwobaxox.pdfIn PDF document text
    • http://skogsformedling.se/bilder_umeny/File/wakujaripokimo.pdfIn PDF document text
    • http://luckysim.com/userfiles/file/wasaxuretawavefomalirelo.pdfIn PDF document text
    • http://abbeloosschinkels.be/userfiles/file/96653087022.pdfIn PDF document text
    • http://werkkledingverkoop.nl/images/docman/files/46667852630.pdfIn PDF document text
    • https://treasurehunterdetectors.solar-ovens.net/ckfinder/userfiles/files/vavowakagofe.pdfIn PDF document text
    • http://imssp.by/data/images/fxeditor/file/64799857771.pdfIn PDF document text
    • http://humansharehouse.com/userData/board/file/94571483077.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fc776460b7---48133592493.pdfIn PDF document text
    • https://grupa-energia.pl/attachments/file/govosikezedanuxinuda.pdfIn PDF document text
    • http://concilianavarra.com/userfiles/files/toxutabikawivu.pdfIn PDF document text
    • https://projekt-lesen.de/userfiles/file/kiranizaranofa.pdfIn PDF document text
    • http://bagiez.de/userfiles/file/tazatofeterazu.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c7d26231af---lujepa.pdfIn PDF document text
    • https://defi128.com/userfiles/files/gotixokipiv.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161482f5076b27---pobewawulegefewut.pdfIn PDF document text
    • http://xn--o39a91gvwm83kbsn.net/FileData/ckfinder/files/20210905_A6426AECBF09CA69.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_off0000dc1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC1C 10852 bytes
SHA-256: 65d0d6e3d1cc0b429a0f385109ab190e5ee82671c7d18c140eb661b980869724
font_01_sfnt_off0000f51b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF51B 17632 bytes
SHA-256: 18cdfab8fe4c7d818c7c9c109614ae8f035e5a2826bc2adc960ac112178f3ef2
font_02_sfnt_off00012283.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12283 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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