Malicious PDF — malware analysis report

Static analysis result for SHA-256 e679ad7e43a422bd…

MALICIOUS

PDF

86.7 KB Created: 2021-09-11 22:56:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 59084a97fe928d62444fd17244e09296 SHA-1: 2619f8d7d250db7bd33e458e50b7ba58505a9668 SHA-256: e679ad7e43a422bd24c9bff9d6ace51fd0768abb3a5689d9c0f0f0d1ad700da4
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and links to compromised WordPress upload storage, indicating it's designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://chcial.ru/uplcv?utm_term=avengers+endgame+full+movie+eng+sub PDF link annotation
    • https://crownprolaw.com/userfiles/Proj_Name/files/bolokus.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/files/ruwapimivurawajegur.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/161348009aeecf---84918478615.pdfIn PDF document text
    • https://pristineleather.com/userfiles/file/77694462982.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/51029275218.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/161396847125f6---7184222158.pdfIn PDF document text
    • http://ji-tien.com/userfiles/file/65927213433.pdfIn PDF document text
    • http://bbfrontedelmare.com/userfiles/files/5617045531.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/juvosagekitatorubitujole.pdfIn PDF document text
    • https://frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/56143557522.pdfIn PDF document text
    • http://alda.pl/ckfinder/userfiles/files/nusurewamibak.pdfIn PDF document text
    • http://93564497.com/userfiles/wudakopopokij.pdfIn PDF document text
    • http://vesimport.ru/userfiles/file/52975454904.pdfIn PDF document text
    • http://hebammenglueck.de/ckfinder/userfiles/files/vikilu.pdfIn PDF document text
    • https://educationindiajournal.org/ckfinder/userfiles/files/32296019833.pdfIn PDF document text
    • http://preiss.at/upload_files/files/pifuzawozanewipe.pdfIn PDF document text
    • http://candientu24h.vn/webroot/img/files/13904605082.pdfIn PDF document text
    • https://www.abrasco.org.br/ckfinder/userfiles/files/3452970446.pdfIn PDF document text
    • http://giaydantuongphongngudep.com/images/news/file/93011564454.pdfIn PDF document text
    • http://www.dean-cpa.com/files/adminpic/file/90193119185.pdfIn PDF document text
    • https://nirmalujjwal.com/public/ckfinder/userfiles/files/28391599308.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1613460f21fd08---nudarape.pdfIn PDF document text
    • http://xn----dtbhwhggdaoqfh3d.xn--p1ai/media/file/mojajarafukuruxiroru.pdfIn PDF document text
    • 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_off0000eb09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB09 18644 bytes
SHA-256: bf4f8e9904d1720fd4e3a2edb2ee08fae1c6d5641a7f851a8a7c2f573321d594
font_01_sfnt_off00011c24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C24 10888 bytes
SHA-256: 2df085e0da3553f05b69db5965c7ca32d23840c25995b95c5cdd2d40a480ca48
font_02_sfnt_off0001351e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1351E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1