Malicious PDF — malware analysis report

Static analysis result for SHA-256 87af210e5ce68185…

MALICIOUS

PDF

83.3 KB Created: 2021-07-16 10:51:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 6622bf442c6e32a88a49d345eb82fd66 SHA-1: 6941b62c933056f49a2c2227b5e42af87dc0df57 SHA-256: 87af210e5ce68185efdb787d2b74d0811afd1664b023c2f35b38e0df7395a316
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs that point to potentially compromised websites or disposable hosting. The primary purpose appears to be redirecting users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://restorationteleconference.com/clients/73716/File/pajedefapuv.pdf In PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/f37670f458d544d230ceb498e9986641/lofegegelokusijisurabijot.pdfIn PDF document text
    • http://reicar.dk/userfiles/file/37788436416.pdfIn PDF document text
    • https://cafesca.info/ckfinder/userfiles/files/73559844309.pdfIn PDF document text
    • http://szentdorottyapatika.hu/files/36976455653.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/tivejikobibiberip.pdfIn PDF document text
    • http://carrozzeriabosini.net/userfiles/files/67903319182.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a91b380d725---61933075870.pdfIn PDF document text
    • http://timelessmebel.ru/wp-content/plugins/super-forms/uploads/php/files/770e9003a9b4090066280ad2fa59682e/57861289291.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/dfec86ff02bfb64cfb5c3753783e6a1b/gilibu.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/d3207954c746e59cb6ea90ebb8514e67/kidodilet.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c888c87cb92---16777062780.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084e21193184---potamonikufefe.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/r5e97hse7euel7jaqlqadtojm4/45882993684.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e7e4a20e52a---71706869137.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/7116a34f1a6e219d9d3502c88c88b6f6/42225662675.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/zizugu.pdfIn PDF document text
    • https://lamaisonducoeur.ca/upload/editor/file/21027724064.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/pasaluzekeximimiguwe.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/f22423edb5a4b35c12a59a1dfbf1fc87/fekabilisanozu.pdfIn PDF document text
    • http://bigcool.net/webroot/img/files/9069531835.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=i+suggest+toPDF 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_off0000e863.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE863 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010075.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10075 16448 bytes
SHA-256: 290a2a1d403e709317460d5ad719a743cfeb17476ca7a2df83bfde49e36a4ada
font_02_sfnt_off00012ae1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AE1 9828 bytes
SHA-256: 951fa0084dd130e3fe9b0f8af8a817e02023e06b13c83ed2b2f93768727ffbd0

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