Malicious PDF — malware analysis report

Static analysis result for SHA-256 80c3ad40d7fa8292…

MALICIOUS

PDF

87.1 KB Created: 2021-06-27 12:25:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9ebdec3cad6ee4406627750de839b6dd SHA-1: 31c59bb94f618a3dc6bf0103c5642fe676a82ec1 SHA-256: 80c3ad40d7fa829225b7bd08071e3b494942d54a7fdbd1d870057f4779d5a0ea
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress installations and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the heuristic firings and URL patterns are highly indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://garglob.ru/uplcv?utm_term=planting+rye+in+fall
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f6220e0aaf---wivelinedaduvevo.pdf
    • https://zlato-eu.cz/upload/files/88177051199.pdf
    • http://yongqingtech.com/d/files/jukabanapabepe.pdf
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160730e8a9769d---goxotiwesapetat.pdf
    • http://a-kamen.com/userfiles/file/18248800684.pdf
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080d32f88a7b---26241487342.pdf
    • http://pantryscan.com/123cars/imagefck/file/71102988722.pdf
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/4fb22118f7b54b5af438564af2c8293b/rosolotesogefenixevuro.pdf
    • http://asupuro.com/user_data/image//file/xugawiwulezule.pdf
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160942ec56a6e8---jubivuzela.pdf
    • http://botosani.ro/img/uploads/file/vitawosezenedabitorivugo.pdf
    • http://www.deopendeur.org/imgUser/file/29298387189.pdf
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9a1dd37de8---77065230756.pdf
    • http://jnafarms.com/clients/864068/File/93858373825.pdf
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/ffda6bdca807ff46a6dbbcafb0986a1f/65837985738.pdf
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/u26ln7t1gttl9hq4pkfc1mopr7/gaxavafobokazit.pdf
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/ufp2nmn9kgue0ba9u1enqel8dl/5078732985.pdf
    • https://portugaliaimagyarok.com/ckfinder/userfiles/files/rupag.pdf
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/4j53pb142juhq7a6jsgkr4gq71/jesawinidizadizopegevebiw.pdf
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16080f2885833d---xutogaruxofinezoz.pdf
    • http://hillsdale66ersreunion.com/clients/c/c6/c679c52642bc64dd8629b98fb95ccc77/File/tilijunowavobugu.pdf
    • http://angelcabrera.com/FCKfiles/file/34013848635.pdf
    • https://nutricionintravenosa.com/wp-content/plugins/super-forms/uploads/php/files/f43a92508a6cb1f33d96a531c2e9bd76/xukolivil.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_off0000f0df.bin
a6d3f7d508d4ae21c4aa170fae0954a0ee7b3aaa28b7a2b9038e856daf970c4a
pdf-font-stream PDF embedded font (sfnt) at offset 0xF0DF 10216 bytes
font_01_sfnt_off000107e7.bin
1f2b44928c9029a0f7ce6f0af0785618da7712645945609821d4bd4d951ea6a3
pdf-font-stream PDF embedded font (sfnt) at offset 0x107E7 17596 bytes
font_02_sfnt_off00013619.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13619 16792 bytes