Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b0857d7c79bec12…

MALICIOUS

PDF

80.8 KB Created: 2021-09-16 22:08:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fb48851fb7847ec20ed189d5ff6224ca SHA-1: e616ef7d3cd3e750804e348dfd49ce73f8cde889 SHA-256: 9b0857d7c79bec12b44c89e8f55ccf2c369c2a08666e2fe628da586e44e144d6
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress upload storage and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the PDF structure and URL analysis point to a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://hoinhikhoavn.com/img/files/26992024515.pdf
    • http://www.syrahresources.com.au/application/third_party/ckfinder/userfiles/files/53418142237.pdf
    • http://flyingwedge.com/uploads/assets/file/43367144519.pdf
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/advlp5t99461hvitd5nt26plvd/fosarines.pdf
    • https://ermolino.mebel18.com/uploads/files/mikulakulutijatikipagip.pdf
    • http://centromedicoveterinarioadda.com/userfiles/files/36195105599.pdf
    • http://www.beautyvogue.ch/Files/file/butalibokifoxuzujaz.pdf
    • https://kitchensofdiablo.com/upload/file/paliwukipegejufufegake.pdf
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/dj97o6a15q0kk6jusb4kf4sfrn/denuwuxemejevuronanabe.pdf
    • http://satakantaresort.com/user_img/files/82725748520.pdf
    • http://xn--9i1b14l32gg2dsybq3b.com/upload/fckeditor/file/gisikewinupipebolazibiv.pdf
    • https://peoplesmodelinternational.com/ckfinder/userfiles/files/dovejuvuju.pdf
    • https://noursportevents.com/wheelmarine/userfiles/file/bivemusafadotukanudawenu.pdf
    • https://investmentskillsgroup.com/images/userfiles/file/bakigedub.pdf
    • https://fiscconsulting.com/userfiles/file/96272035089.pdf
    • https://horizontire.com/userfiles/file/zokuwuwi.pdf
    • https://quatden.vn/webroot/img/files/fufasefatepukada.pdf
    • https://learnrkb.jugalbandiresearch.com/ckfinder/userfiles/files/41723598209.pdf
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1612f06fc6856f---61121426191.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16138832c3c501---lezaxalin.pdf
    • http://gma.ge/admin/ckeditor/ckfinder/userfiles/files/pibuduwabirawo.pdf
    • https://www.ksmt.edu.np/assets/ckfinder/userfiles/files/xevularosomuminusudop.pdf
    • http://lmalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/56606103785.pdf
    • http://www.mueblesgamez.com/ckfinder/userfiles/files/jagenebisebokorimusewo.pdf
    • https://alicantea.centralcms.cloud/galeria/files/pusoluxabarokafutapete.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=design+basics+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d74e.bin
637b454e5fd16c4e41b60e4808de7cd4226cc896c27755abcf6d5cba0f8309d2
pdf-font-stream PDF embedded font (sfnt) at offset 0xD74E 10572 bytes
font_01_sfnt_off0000ef25.bin
da76e9630fd61846aadce4d017d05966166d319ab8c8fa93aec326e8e1e28979
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF25 17744 bytes
font_02_sfnt_off00011d53.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11D53 16792 bytes