Malicious PDF — malware analysis report

Static analysis result for SHA-256 d089904a8c51b615…

MALICIOUS

PDF

81.9 KB Created: 2021-09-16 03:00:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: f16a1d6ae530798eec358b1c9da1a9d4 SHA-1: 202e5cff88e16923c1ba836619b3acb8e34e9bf9 SHA-256: d089904a8c51b615884c6b6bede5b4a7c3381f5f9423e1a820d5c205c23339c0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised WordPress sites hosting PDF files. These links are structured as a link farm, likely intended to deceive users into downloading malicious content by offering seemingly legitimate resources. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 https://archism.ru/uplcv?utm_term=ms+office+2007+product+key+free+download PDF link annotation
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140c5c95f5b8---25471882902.pdfIn PDF document text
    • http://wu-pao.com/upfiles/editor/files/24705063414.pdfIn PDF document text
    • http://wish-pharma.com/upload/files/sudolewufifu.pdfIn PDF document text
    • https://conexus-study-abroad-travel.com/ckfinder/userfiles/file/5345355929.pdfIn PDF document text
    • http://tipkeo.com/js/ckfinder/userfiles/files/97453565534.pdfIn PDF document text
    • http://quangcaosms.org/media/ftp/file/lugowaxumi.pdfIn PDF document text
    • http://sanyosushiglendora.com/uploads/files/90506532293.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/161423284a6ff4---31955883866.pdfIn PDF document text
    • http://opuspoint.com/ckfinder/userfiles/files/faverosuvafo.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161390d82bf65c---pedesorewilaru.pdfIn PDF document text
    • https://gesema.com/UserFiles/file/xiluzanakitivaz.pdfIn PDF document text
    • http://medrea.ru/upload/files/xizaviloravukivukuxa.pdfIn PDF document text
    • http://2sisaccount.com/userfiles/files/baloporurisitojapi.pdfIn PDF document text
    • http://lex-ter.ru/admin/ckfinder/userfiles/files/43326691231.pdfIn PDF document text
    • http://104408017.linker.tw/files/kevopuwaxuv.pdfIn PDF document text
    • http://huyndaicaudien.com/upload/files/26783769198.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/d40b69d11f19492d1b4b09e0fafd2a22/vumemidowumod.pdfIn PDF document text
    • http://freeorden.com/media/file/43010433206.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/e7119b08a5a6840f28cdf263116c6f3d/fokevujemunotolenejowi.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d00c1db1d9---35529242271.pdfIn PDF document text
    • http://usarsenal.it/userfiles/files/zaxowo.pdfIn PDF document text
    • http://miet-boot.ch/images/uploadedimages/file/60207611714.pdfIn PDF document text
    • https://bhsbeacon.com/FCKeditor/file/86081816082.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bff17ccfca---82442795683.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_off0000d8b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8B9 11288 bytes
SHA-256: b9cab3efb83fb0e7e5c4d117e0b5ada6bf9f2bdf9b2b38039c362e1de8560079
font_01_sfnt_off0000f3a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010bb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BB2 17832 bytes
SHA-256: 0245e8e3a174a39e56068db5ffc46091dca6a6672509606029c84564953f86ef

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