Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d35f59731bd2a01…

MALICIOUS

PDF

136.4 KB Created: 2021-06-29 02:11:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 986ca13d7606915c942751af103df693 SHA-1: 24b9eeb0673168c2e3b22d4db0c9f9aeec12f2cb SHA-256: 0d35f59731bd2a01a9541788b6e967f01f9dac83f6ac1e7950a3b0c5d0dc79e8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV, indicating it is likely a phishing or malicious content delivery mechanism. The file contains a link farm pointing to compromised WordPress uploads and other disposable hosting, suggesting an attempt to distribute further malicious content or manipulate search engine results. Although no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest it is designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9921

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://stpeterscbs.ca/ckfinder/userfiles/files/mejaxapufufaxosam.pdf In PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/a54937f62943e02d3c4baba590b8bcd1/22063916271.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/d3a2bc701106820548c90124e7802b80/32323870707.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/8avdttt9cthv4lo0642fispfb7/jedomawunurikojetixe.pdfIn PDF document text
    • http://crystal-lamp.ru/uploads/files/14148603922.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/tuputc97rdnjucera3fsgcjldb/dabuwivab.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/61d356aff6865382f031e23c265a83e8/rifeterifelevasatuziwet.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/bb23af957d631cbf76d357d6bb502fd8/87681043408.pdfIn PDF document text
    • http://pahsclassof2005.com/clients/d/d6/d61c4c031b0f3af13d3e88110ef3a3e1/File/38369469376.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c63d4ad4dee---58142466475.pdfIn PDF document text
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/f18kpb3chgo6ib4ga6hr1o5eeo/33495747520.pdfIn PDF document text
    • http://abimobiliare.pl/pliki/File/refagubedujokuganu.pdfIn PDF document text
    • http://eltonltd.ru/sites/default/files/uploads/11911386183.pdfIn PDF document text
    • http://www.pilonidalsinus.gen.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8f21d1090---logulawabozefogegiruvubaw.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/31ce2d4c945488a0c94abb528666b14b/62550743719.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e3bcdc5ecb---tatumogujop.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/2pt4g76f590294plglvd7ggpou/10929401272.pdfIn PDF document text
    • http://deccanquest.com/konadnew/userfiles/file/rumuborakare.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c0a0c35b95---toxirifezexiwopogatiti.pdfIn PDF document text
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/95621675135e09f78fae74688413d1bf/somepo.pdfIn PDF document text
    • http://aucoindeshalles.fr/menu/file/48935433555.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609740bb86b83---fevafezimupozugox.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160b8a682d9e6f---lilaginev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=letter+to+the+god+question+answerPDF 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_off0001b500.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B500 18168 bytes
SHA-256: 0ee4b98328758b23091bb43c34d594b0a18c51ddc51b1cafb14c98d4402bb797
font_01_sfnt_off0001e389.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E389 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001fba0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FBA0 10768 bytes
SHA-256: cd2c3975c342a66e686e024cd7754e20773c924f37362a95542c6bedaca5d273

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