Malicious PDF — malware analysis report

Static analysis result for SHA-256 29ec0e9ab29b6319…

MALICIOUS

PDF

82.6 KB Created: 2021-09-01 01:29:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 6d043114a67a1ce86811b82ae6d37057 SHA-1: 228d3c1380b391fbe8d16b470c5fde808841a16c SHA-256: 29ec0e9ab29b6319273ca7aa264cd89264cbd3942883fa3d61ff3520b1b6e370
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting an attempt to redirect users to malicious sites. The document body is heavily obfuscated and unreadable, but the presence of numerous URLs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly indicate a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://xn--80aaijz0c.xn--p1ai/ckfinder/userfiles/files/30307206534.pdf In PDF document text
    • http://lpkgoodframeupvc.com/userfiles/files/94296518485.pdfIn PDF document text
    • https://yasacompany.com/upload/files/xatajedarikekofaja.pdfIn PDF document text
    • http://a1climbing.com/userfiles/files/fejogisinexevuwixa.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/7e75664d8590e4e972bdf42864f332ec/bijimividirumizovorad.pdfIn PDF document text
    • http://alexdisinfestazioni.com/userfiles/files/gabafan.pdfIn PDF document text
    • http://giaexploring.it/userfiles/files/57553363488.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/68741062645.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16073008638e06---xopexefaxot.pdfIn PDF document text
    • http://contentworks.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca785bd764---vakevokuwisino.pdfIn PDF document text
    • https://tonymusic.se/UserFiles/files/voxaxokaxupeniwuni.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/a802ab4d974ecc7c8cdd0a803909475b/42597658815.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6b9b37ae4---13920412011.pdfIn PDF document text
    • http://architetturaurbanistica.it/userfiles/files/zananunewokukepovopizavo.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609ff6ad7472b---bojiwi.pdfIn PDF document text
    • http://stoka-saarlouis.de/userfiles/file/41208239554.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16084f4d22f685---48048205054.pdfIn PDF document text
    • http://emanuelmlevin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/70488621125.pdfIn PDF document text
    • http://bright-inter.com/file_media/file_image/file/82194500558.pdfIn PDF document text
    • http://4grd.com/cmsimages/file/xefizuzaluzigavino.pdfIn PDF document text
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/8b5e493e4fbde3ec4bf09511e18ea8e0/tolezigojisudosomojasodas.pdfIn PDF document text
    • http://zsmnowakowski.pl/userfiles/file/6578801510.pdfIn PDF document text
    • http://nationalherbo.com/userfiles/file/48670358826.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=model+hr+interview+questions+and+answersPDF 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_off0000dec4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEC4 17452 bytes
SHA-256: 4cca14c211acd01c3a3d81ebe11bba61c332baaefb7cde31d73725dfd5a99bc6
font_01_sfnt_off00010bdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BDF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000123f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123F6 10736 bytes
SHA-256: f8a3f6bcde0096d96d889c21ea9e2fc978b95d6eaa0aabd1d6bc87ed5953ae61

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