Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cd72a62b089b6ca…

MALICIOUS

PDF

75.9 KB Created: 2021-08-19 02:36:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1dd18aea583b762afe3023d9072b9e0a SHA-1: 2de4612d1b2084d7ed2f6c4f8f2256d3683a8aae SHA-256: 6cd72a62b089b6ca1c0cf371af53157b3988126b018dc8895fbdb7b1c2709423
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it's likely a phishing or malware distribution lure. It functions as a link farm, containing numerous URLs pointing to compromised websites and disposable hosting, designed to redirect users to malicious content. The presence of external URI heuristics and link farm indicators strongly suggests a phishing or downloader attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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=how+to+calculate+weight+of+steel+bar+in+kg+per+feet PDF link annotation
    • https://jairdefreitas.com/ckfinder/userfiles/files/xumibadoxagifajo.pdfIn PDF document text
    • http://animalscipublisher.com/files/upfiles/file/52044234250.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/e71daf858553d4467abd988f97cbaa0a/87300331665.pdfIn PDF document text
    • http://tipsclubcr.com/campannas/file/50228356048.pdfIn PDF document text
    • http://chaukitchen.com/uploads/files/2698775729.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608be4c3c382d---pufaxobivemomeja.pdfIn PDF document text
    • http://tourhong.com/FileData/ckfinder/files/20210619_FF2523513E8D3BFD.pdfIn PDF document text
    • https://xenang-mitsubishi.com/fckupload/file/jalujiwawikisuz.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af8836baeab---vosuter.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/72c2933d86bb3d4ca3d7cebc09eac399/pizoras.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/6b2c6cb3e2995534bea002f8131e1f61/89528963481.pdfIn PDF document text
    • https://motodubai.com/uploaded_images/files/ralikimepurinaxukafazokod.pdfIn PDF document text
    • http://moon-villa123.com/CKEdit/upload/files/lilagerodolupuw.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab99d1b87d3---64381006108.pdfIn PDF document text
    • http://ourdesign.hk/ckfinder/userfiles/files/bofojutaliwezuwesup.pdfIn PDF document text
    • http://deurenhanger.nl/userfiles/file/vukazuvibomijilajot.pdfIn PDF document text
    • https://xanbiente.de/userfiles/file/baroxomoguxoborigesan.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a2747199787---87817954406.pdfIn PDF document text
    • https://altaamir.ipixpms.com/Rapport/public/assets/ckfinder/userfiles/files/71831098795.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609b38eb95b95---mowajomavajolefat.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/zezogugikosexesuz.pdfIn PDF document text
    • http://cs-golfclub.com/ckupload/files/ketajafogekojidazomew.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_off0000c5c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5C7 16232 bytes
SHA-256: d38dc16846c08b026e0bbb14b32bf6b3b1c0b6da31a5eb6ce2ba88732770f110
font_01_sfnt_off0000efd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD8 11168 bytes
SHA-256: 4e14fbbc6f14226eb95e8a28a206c00f089044b887a09beb16e4293c02d5a9e5
font_02_sfnt_off000109b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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