Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc79b8fa650d15b9…

MALICIOUS

PDF

80.4 KB Created: 2021-09-02 05:05:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e09a8c1a00cd7b317c64e0c3ac06361a SHA-1: f0d92f3a42f353e97f1d3401e5bd92824e428d2a SHA-256: dc79b8fa650d15b93933da53228019f9ae8c81268de0dfda1de1c2de04f454a3
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous external URLs, many of which are hosted on disposable domains or appear to be compromised WordPress installations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery through these links. No scripts were extracted, and the document body was unreadable, but the heuristic findings and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb949c6fdcf---75700021268.pdf In PDF document text
    • http://ongxoanhdpe.vn/upload/files/damap.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e0016f2a5e---jakuzikelazopex.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/gh7tb14msbt8a8u8pij5lkkn07/64068190639.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b00b8bb560e---39635432128.pdfIn PDF document text
    • http://koovappadyscb.com/ckfinder/userfiles/files/tolinitolefigevenek.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f2db9b04b35---wiruxufejode.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/94a156615f5b6be4081c18ef7ebb4311/49493090673.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071bc3838a25---50074055193.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e0e1fedd7d---75832987466.pdfIn PDF document text
    • http://ratchee.com/ckfinder/userfiles/files/61590006156.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160709a0b81f82---90310371324.pdfIn PDF document text
    • https://highendteen.com/userfiles/files/78732164196.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/5innm90l1gjo395m74r1s57fvf/tukab.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/runujemiwekojozuwib.pdfIn PDF document text
    • http://revucue.com/ckfinder/userfiles/files/1573882488.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/f88c590e1ed648c58ac8073a1b898f6d/14409837760.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160877e7dc6ab0---zovimumotoz.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/bc61b2a04800c83339236bdcd9af71a5/vilewifujasijajo.pdfIn PDF document text
    • http://gelateriacool.it/userfiles/files/misumifabanuzezuv.pdfIn PDF document text
    • https://isabellepieman.com/userfiles/file/95798995094.pdfIn PDF document text
    • https://btsmstlucia.com/atomicsteps/upload/userfiles/file/kigim.pdfIn PDF document text
    • https://bestcoloringpages.com/userfiles/file/noxotuzalaxofidavuni.pdfIn PDF document text
    • https://banghenails.com/upload/file/53054936007.pdfIn PDF document text
    • http://uci.ir/userfiles/file/87344123479.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=from+a+to+zay+pdfPDF 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_off0000d6c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6C3 10268 bytes
SHA-256: 0d868bd53dd3c69bf0bc8c57d42884260ff4262ba9f7c2019d64ef65f8bdbb48
font_01_sfnt_off0000edec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDEC 17456 bytes
SHA-256: ede0c7f3c7d3d65672c6dce2bc04df1e93d8be93772b42435d813d2f97e29377
font_02_sfnt_off00011b38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B38 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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