Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b4fd46e3ffecd25…

MALICIOUS

PDF

86.6 KB Created: 2021-09-16 20:14:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 89cd199318a6316eef49f1c7a14eaaf6 SHA-1: 508ffc20fc0b015598f631074d4c26531e5ab308 SHA-256: 9b4fd46e3ffecd25140d3163c5ba070fa0a328939fb8cbe659c42ba7a59387ee
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised or disposable domains, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of multiple PDF link farm heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://amicalelaique-guyancourt.fr/ckfinder/userfiles/files/44603470870.pdf In PDF document text
    • http://sb-78.ru/files/file/jeleripevowunutesasovofux.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/59bd72e5fe3d69a0eab495ea36a4f84e/dejedifejaxovomimegimiwip.pdfIn PDF document text
    • https://detector-billetes.com/Imagenes/file/48847394374.pdfIn PDF document text
    • http://futimisdev.com/userfiles/file/josukesiduxafekanejijofun.pdfIn PDF document text
    • https://z87992961.com/upload/files/20210910155010.pdfIn PDF document text
    • http://hoclaixebinhthuan.com/upload/contentFile/file/13583062789.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/gijifumuzanotitirufopolir.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/2q74iaa7kihk8e3q06o4r0u024/tinufufitila.pdfIn PDF document text
    • http://nwatchonline.net/userfiles/file/tezexetala.pdfIn PDF document text
    • https://tonere.shop/app/webroot/files/userfiles/files/vatitijotubodonon.pdfIn PDF document text
    • http://kasand.com/userfiles/60124187231.pdfIn PDF document text
    • https://e-ssuances.com/ckfinder/userfiles/files/fabusarajeje.pdfIn PDF document text
    • http://imobilestore.de/userfiles/file/gelewiku.pdfIn PDF document text
    • http://timebank.ru/sites/default/files/photos/pagefile/90907141413.pdfIn PDF document text
    • http://4els.ru/uploads/images/files/tomulu.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/161315946b1c05---59031335529.pdfIn PDF document text
    • https://kipass.fr/userfiles/file/47081062166.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/16137f2f1257d6---gozevezevol.pdfIn PDF document text
    • https://alutat.com/data/file/20980631272.pdfIn PDF document text
    • http://355353.ru/userfiles/file/lajumazuduxexig.pdfIn PDF document text
    • http://erisalaw-chicago.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/96318561401.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/e9d412496a1beb6927058af64e8b59ec/35295899389.pdfIn PDF document text
    • http://rydelko.eu/userfiles/file/pitovobunosiberutibodo.pdfIn PDF document text
    • https://lordoptika.hu/files/files/77546359615.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=best+free+cad+app+for+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_off0000ecad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECAD 18056 bytes
SHA-256: 3f20347c848ef53243b237f772927685c633a460ed264ee6176408614b069a26
font_01_sfnt_off00011b94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B94 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000133ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133AB 10620 bytes
SHA-256: 1988054e7bccd672a1daed409fb3e4edccb7287b2af04cf957648018af86f9e5