Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6b865b4b86e08e4…

MALICIOUS

PDF

69.0 KB Created: 2021-10-03 03:05:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 4e386a6351667e129703e4c6e0d8eaaf SHA-1: 847608f22f843b55021d21f3a4a7828681d66601 SHA-256: e6b865b4b86e08e472483bccdda71158bea9578493eda81ffc21e97ea1fa4d8f
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised WordPress sites acting as hosting for further malicious PDFs. The ML classifier and ClamAV detection strongly indicate malicious intent. The primary attack pattern involves luring users to click on these links, which are designed to lead them to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16145a80074daf---melijiximewevajudababe.pdf In PDF document text
    • https://bandai-k.com/userfiles/file/sufaroganawazilazakil.pdfIn PDF document text
    • http://gianenricofabro.com/userfiles/files/42931884993.pdfIn PDF document text
    • http://xn--h1aaebajlcgx.xn--p1ai/sadm_files/muvapupatilisagimipag.pdfIn PDF document text
    • http://sweepinstyle.com/userfiles/file/kajog.pdfIn PDF document text
    • http://gemmacapitalgroup.com/foto/file/kejirurijijiniri.pdfIn PDF document text
    • http://sfinance.mn/userfiles/files/wurep.pdfIn PDF document text
    • https://gastriklandsbf.se/UserFiles/files/xudazomi.pdfIn PDF document text
    • http://needychild.org/ckfinder/userfiles/files/35063907637.pdfIn PDF document text
    • https://www.profiemg.cz/upload/ck/files/xigimolorikuti.pdfIn PDF document text
    • https://tsolisp.com/files/file/sigekekeko.pdfIn PDF document text
    • https://perfecthospital.org/ckfinder/userfiles/files/tasuritowo.pdfIn PDF document text
    • http://studioego.cz/userfiles/file/16458710830.pdfIn PDF document text
    • http://studioprogettoarchitettura.eu/userfiles/files/jedidoduzegukomogererab.pdfIn PDF document text
    • https://e2imgu.ratnatelenet.com/UserFiles/file/28415010696.pdfIn PDF document text
    • http://status-go.net/gfx/userfiles/files/23714627745.pdfIn PDF document text
    • http://iowatriallawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fuvofozebagop.pdfIn PDF document text
    • http://100gastro.cz/soubory/files/vikavudevuzogeririjowil.pdfIn PDF document text
    • http://gamjagolla.com/uploads/files/4040435696.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613045c565555---32445564916.pdfIn PDF document text
    • http://xiangzhuan.tw/upload/files/xotakemeboxeki.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/a9f65eb06b05a626d29d4f10229e9dff/latiku.pdfIn PDF document text
    • http://www.octopus-quatuorvocal.com/ckfinder/userfiles/files/fatifunaneguja.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=dragon+age+inquisition+magePDF 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_off0000af2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF2C 15640 bytes
SHA-256: 6b01a844acd4dede2e2b19e70776078f1cf258b3f087deab47d156cf45094be6
font_01_sfnt_off0000d681.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD681 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ee98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE98 10652 bytes
SHA-256: 087203cf24d03f1956350dfe9b1661642179b1abb95adb23ad5825928ef7d04c