Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cd86b2d2098d959…

MALICIOUS

PDF

80.1 KB Created: 2021-09-28 12:06:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 059b5adbadd845c42c443d8cdac71b5c SHA-1: 5d3294a13ab2f14a667bd2a96e36973a3695419a SHA-256: 0cd86b2d2098d95959f4c40947d0bbd462b8c2cdcb331b6a5fa3e33e4ce90b70
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It functions as a link farm, directing users to numerous external URLs hosted on potentially compromised websites or disposable domains. The primary purpose appears to be SEO manipulation or directing users to phishing or malware distribution sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://coretry.ru/uplcv?utm_term=introduction+to+environmental+engineering+and+science+3rd+edition+solutions+pdf PDF link annotation
    • https://aquamedicasatumare.ro/ckfinder/userfiles/files/44476223628.pdfIn PDF document text
    • https://termofriz.rs/files/faxumekedomikujozedazamox.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/958d22b13dab266cb62d7918573f8861/21800944260.pdfIn PDF document text
    • https://communitytreasures-co.ravebusiness.com/gbe/useruploads/blogs/files/wuzimewim.pdfIn PDF document text
    • https://archielectronics.com/userfiles/files/lupofave.pdfIn PDF document text
    • http://kingsfinancialconsulting.com/userfiles/file/81817367749.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138799644cf2---30906085375.pdfIn PDF document text
    • http://mmckno2010.zkosuchdol.info/files/82924990978.pdfIn PDF document text
    • http://vdi.vn/userfiles/file/nelaxemurezetopi.pdfIn PDF document text
    • https://jamurgoreng.net/contents/files/3489285033.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/9d731433b1a528f23ef17aac2e0d9b0c/nejogajif.pdfIn PDF document text
    • http://industrialsupplies.pk/userfiles/files/defawopazupisapizakisid.pdfIn PDF document text
    • http://remproekt-m.ru/admin/ckfinder/userfiles/files/porunekifugorepa.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/5f009bc61923525ee0dd786084909824/xetuvodiwobenumupi.pdfIn PDF document text
    • https://adeptos.clevercloud.pt/images/items/files/pikefufigemaminazef.pdfIn PDF document text
    • http://dalnoboy.org/data/filestorage/upload/files/83806872086.pdfIn PDF document text
    • http://chipgene.com/image/files/20210926_042021.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/fef0a194b9437f05284c16422e619b45/94374561023.pdfIn PDF document text
    • https://gimenezricarte-deltabogados.com/ckfinder/userfiles/files/konamida.pdfIn PDF document text
    • http://studiocastigli.eu/userfiles/files/24746656281.pdfIn PDF document text
    • http://cn-noah.com/uploadfile/file/sibebafotofifivozijuzap.pdfIn PDF document text
    • http://jlicentral.com/images/authors/file/1524885281.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140157383aa5---zawiwiribivivutadoxavex.pdfIn PDF document text
    • https://educhina.mn/editor/files/mibifugob.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_off0000c6f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6F6 11252 bytes
SHA-256: b0ce228227da9bb1cba9a125c68d453b80e9cc3fda84711cd00e5ed0e506807f
font_01_sfnt_off0000e135.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE135 20216 bytes
SHA-256: 82a7b08636fd6259300b3b61d664a9ce3d83e66fecb7d5153f3c66427b73649c
font_02_sfnt_off00011722.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11722 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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