Malicious PDF — malware analysis report

Static analysis result for SHA-256 982023526d5d5779…

MALICIOUS

PDF

83.4 KB Created: 2021-09-20 01:01:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: f78d931c4d754a04a43079a5cee5d455 SHA-1: 1d5df814f18abaccf8a824dfe65f1ed330b31aca SHA-256: 982023526d5d5779f430897c2536e113b91d32e41f2752f93d706b65fbb06f78
164 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to various external URLs, some of which host further malicious PDFs, and includes a visual download button lure. The presence of multiple compromised CMS upload links and disposable hosting suggests an attempt to obscure the true origin and host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://oniceh.ru/uplcv?utm_term=xbmc+for+android PDF link annotation
    • http://choinka4x4.org/cms/files/file/34010648943.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1614799c60ca77---53154140880.pdfIn PDF document text
    • https://ntct.dz/ckfinder/userfiles/files/kutisebizafevejo.pdfIn PDF document text
    • https://umiyawoodworks.com/fckdb/userfiles/file/54088894771.pdfIn PDF document text
    • https://colakcivi.com/userfiles/file/lirupikowigal.pdfIn PDF document text
    • http://konemara.hu/userfiles/file/xatifatef.pdfIn PDF document text
    • http://urduhadith.org/survey/userfiles/files/denenixesekilir.pdfIn PDF document text
    • http://www.cda.org.hk/ckfinder/userfiles/files/23728716475.pdfIn PDF document text
    • http://novastal.pl/userfiles/file/mobilijove.pdfIn PDF document text
    • https://ctners.com/ckfinder/userfiles/files/65498312071.pdfIn PDF document text
    • https://snf.styleguides.ch/userfiles/files/74835693055.pdfIn PDF document text
    • https://clubselect.ro/ckfinder/userfiles/files/gujulipuduxij.pdfIn PDF document text
    • http://kaitianjinghua.cn/admin/userfiles/file/202109200546050917.pdfIn PDF document text
    • https://jss-moms.si/upload/File/vixovikop.pdfIn PDF document text
    • http://ilkconstruction.com/Images/Media/files/kiritukabebuwevejege.pdfIn PDF document text
    • https://euroquimicadistribucion.com/zabaleta/data/imagenes_contenidos/file/paniwuxar.pdfIn PDF document text
    • http://www.rafaellucenaehijos.com/ckfinder/userfiles/files/54969577235.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/6a26215aa3d409a15bf844f9f0a4923c/26476854231.pdfIn PDF document text
    • http://honeystraw.com/uploadfiles/file/logutuxojot.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/cobi164r5r7mab0nnbb6cnkjko/nolukep.pdfIn PDF document text
    • http://medwin.kr/userData/board/file/92191843360.pdfIn PDF document text
    • http://naturalmis.com/userfiles/file/40819897454.pdfIn PDF document text
    • http://turnyras.lt/Files/file/51115983705.pdfIn PDF document text
    • http://erisalaw-chicago.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/27061332945.pdfIn PDF document text
    • http://frutapac.es/ckfinder/userfiles/files/78344914177.pdfIn PDF document text
    • http://xn--c1aejbdnke.xn--p1ai/admin/ckfinder/userfiles/files/55498844586.pdfIn PDF document text
    • http://bibrka-school.org.ua/ckfinder/userfiles/files/mamugerapumutaj.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130ea324c426---sefufijapivenutebosobugu.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_off0000e01b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE01B 18668 bytes
SHA-256: 45d4cf5e44dc7a1306c193c04f5f2bf287ccfa72b5a9e968ef4941e00f1df619
font_01_sfnt_off00011056.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11056 10340 bytes
SHA-256: 4e930d42b2f62d700c0998334aab36d67e809295261922b37828dc3e7946551d
font_02_sfnt_off00012795.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12795 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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