Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5af54874abc31b2…

MALICIOUS

PDF

84.7 KB Created: 2021-09-16 00:28:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 45d4320c69b5cc0dbf7a3a3e4abfb6d7 SHA-1: 8ffa1a1e96a4513a9d297210085dd025acb11079 SHA-256: f5af54874abc31b2c27a9de5c167e9322f6b60b9c466d0fab50440448901007a
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to various websites, some of which are hosted on compromised CMS upload directories. The primary purpose appears to be directing users to potentially malicious or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://nikacarpet.nikacarpet.com/My_Project/Hamishe_bahar/ahar_img/files/sanemokiketokinizage.pdf In PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/7558cae6ca392b4955a56bed9baa7f8b/84589750530.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613b72ee6e207---mirizarog.pdfIn PDF document text
    • http://ivankotov.ru/img/lib/file/lipefofunofe.pdfIn PDF document text
    • http://klick-tipp.info/ckfinder/userfiles/publics/files/gigivix.pdfIn PDF document text
    • http://panyuchen.com/ckfinder/userfiles/site_eachfun_com/files/64936083563.pdfIn PDF document text
    • http://hndgyl.com/v15/Upload/file/20219165368495.pdfIn PDF document text
    • http://vlajamo.cz/images/file/bopujojakoganamawekuret.pdfIn PDF document text
    • http://sun-green.de/ckfinder/userfiles/files/64939701450.pdfIn PDF document text
    • http://metalzilemboeventi.com/userfiles/files/34027008096.pdfIn PDF document text
    • https://pnvvr.ro/userfiles/file/23008708203.pdfIn PDF document text
    • https://huaienclinic.com/uploadpic/files/76434907127.pdfIn PDF document text
    • http://zamgph.com/uploads/file/121637046462.pdfIn PDF document text
    • http://adamex.ukrkarta.ua/fckeditor/userfiles/file/57269469340.pdfIn PDF document text
    • http://vinhthuan.com/upload/files/1676159498.pdfIn PDF document text
    • http://realcomfort.ru/content/upload/file/27149307976.pdfIn PDF document text
    • https://mabuksusu.com/contents/files/27294740790.pdfIn PDF document text
    • http://cellesekorea.com/ckupload/files/67512339629.pdfIn PDF document text
    • http://aleshashop.net/uploaded_files/userfiles/files/fonudafuriwujexagulijiluj.pdfIn PDF document text
    • https://zweefvlieg.net/userfiles/file/peguvofeketudomupobes.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161406b2a2ed50---fumuwaguzavebof.pdfIn PDF document text
    • http://turskazka.ru/ckfinder/userfiles/files/taxagilunurojaxazudu.pdfIn PDF document text
    • http://faceconnects.com/ci/userfiles/files/seripalulotivezuzevotobin.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/76601010166.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16134466518482---99372112527.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=owl+house+season+2+episode+1+full+episodePDF 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_off0000e487.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE487 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC9E 10780 bytes
SHA-256: ef8a2c1f571a13ea3ed5b6c4b27aaa40ba2659688c74d90ed3241dfd14d86a7e
font_02_sfnt_off0001157f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1157F 18212 bytes
SHA-256: 8cd55ee2c85c25484f672d7a237a265753b90da2589edb155d91d81f4a646e1f