Malicious PDF — malware analysis report

Static analysis result for SHA-256 5494f9d0be8bc887…

MALICIOUS

PDF

88.3 KB Created: 2021-08-19 05:01:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: fedfba9e07c2a6c0cdb6e7dc1e8f8152 SHA-1: fe53b81b25ba791904495a2c8984e5a740ec786b SHA-256: 5494f9d0be8bc887c3909467d6a1abd44624d96e802db1cf81bb3c743908c31e
176 Risk Score

Malware Insights

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

The PDF contains numerous embedded URIs, with several pointing to compromised WordPress upload directories and one directly to an IP address, indicating a likely phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly support its malicious nature. No scripts were extracted, but the extensive link farm suggests the primary goal is to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://wavesmaroochydore.com/wp-content/plugins/super-forms/uploads/php/files/ja82dshm5m77umdca21ej7c26t/kakidezu.pdf In PDF document text
    • https://markeishahall.com/wp-content/plugins/super-forms/uploads/php/files/745ddf7de28a4702f679e2a03f55560f/94029280744.pdfIn PDF document text
    • http://cu-hinothai.com/ckfinder/userfiles/files/53216036208.pdfIn PDF document text
    • https://stvorki.ru/files/file/40273565155.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/cc5479101abc00ec7ef863f74b836c32/lifomapomuwote.pdfIn PDF document text
    • https://kisikana.hr/userfiles/file/rezamululodebedopo.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1607b147aebd36---57188011775.pdfIn PDF document text
    • http://nineslash.com/user_file/file/nunokifunixefenosorinuba.pdfIn PDF document text
    • https://technoarc.net/userfiles/file/24746367887.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/42ece7c5sbv3f5pv739j5mh5kf/1028132988.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/9fbaeefa354fb76656d44411ea17a606/4579529418.pdfIn PDF document text
    • http://tumwebthailand.com/ckfinder/userfiles/files/weromifelafuz.pdfIn PDF document text
    • http://gerd-pollak.de/userfiles/file/78739960254.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/06d35244ece436099706c4f68bcd9312/70876320571.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/46493717096.pdfIn PDF document text
    • http://expertsystemgroup.com/file_media/file_image/file/boluzusovud.pdfIn PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/59d7d37d7985db5d4e269958cdabfaf6/2578962792.pdfIn PDF document text
    • http://157.230.241.115/image/upload/File/tusutifajaju.pdfPDF link annotation
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/16078db855b9dd---radukupijuxizefanapiwisa.pdfIn PDF document text
    • http://mfcwestenkwartier.nl/beta/userfiles/file/selijadodewajadejew.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610f0d31f044a---31921383431.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/7nk8g5s4fqen06diojgmpg6u3r/30566103973.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091de7699b61---51259202874.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/165bf8da6142012317ba308e44176ef3/28474068671.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=carte+identit%C3%A9+poisson+maternellePDF 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_off0000f168.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF168 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001097a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1097A 18912 bytes
SHA-256: 1b709f557f60e194a82d11e905fcea93a7986ea7d27e97bb9ef7839d9c296bf6
font_02_sfnt_off0001382b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1382B 10740 bytes
SHA-256: 13b077a12645d3c86cecfc49a5023286eee2eee638192111fcd450206027849e