PDF malware analysis — malicious · 6c13d21486005b11

MALICIOUS

PDF

94.6 KB Created: 2021-06-26 21:07:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25

MD5: 5fa75085f24ab5e3418643a1f8bc0570 SHA-1: f33ea8123c5585a244f21eb9be50a352a0f436fe SHA-256: 6c13d21486005b11da3ce6db6088c3d480e0ad443a1378e75c042f8fe25e09f3

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm or phishing lure. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, providing no direct user-facing content but likely serving as a vessel for these malicious links.

Machine Learning

Nyx PDF Classifier malicious score 0.9935

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://smidgel.ru/uplcv?utm_term=what+is+property+plant+and+equipment+in+accounting PDF link annotation
- https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/76d2e44b3aecd25a58ef42d209b61e81/37382686194.pdfIn PDF document text
- https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/9hk693pos3rtv9o6r68t8fqhdg/keweveponebixukibimenirag.pdfIn PDF document text
- http://almar-bus.pl/userfiles/file/judixadidumalopugujuzat.pdfIn PDF document text
- http://mosjob.ru/images/file/kilaxasedodawisifugelek.pdfIn PDF document text
- http://aihyang.com/userfiles/file/gexesej.pdfIn PDF document text
- https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ad2b1e1471---53962942973.pdfIn PDF document text
- http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/7ed2f16ccd84420f78117f306f647e00/36936406446.pdfIn PDF document text
- https://associazionedynamica.it/uploads/file/nuwifevol.pdfIn PDF document text
- http://bijverhoeven.nl/uploads/files/34892872953.pdfIn PDF document text
- https://faceless.me/userfiles/files/84828720407.pdfIn PDF document text
- http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608f6c63767d1---kawekovolali.pdfIn PDF document text
- https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/e05efdbc1efda7174f1204995d55bd99/2310743849.pdfIn PDF document text
- https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/gniqu03rf5eg90eo43f89em07f/76262469150.pdfIn PDF document text
- https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160964c6287d31---xukadelawufuguse.pdfIn PDF document text
- https://prosperitas.be/data/assets/file/nunitebovawotubokifalew.pdfIn PDF document text
- http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16078f5f18d9d8---28178625180.pdfIn PDF document text
- https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/e63bdcdbd9f519b6bfeddcea80132eb1/75458296035.pdfIn PDF document text
- https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607ddc113e78d---koxezoxiki.pdfIn PDF document text
- http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/aedbf9d4883d6d3da6d32f5707cbaa58/tubabuwizadat.pdfIn PDF document text
- http://naasschoolofmotoring.ie/fckeditor/userfiles/file/5779420449.pdfIn PDF document text
- https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/af2886b57a5c63e2c44f856349643027/89214495378.pdfIn PDF document text
- http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/e86e2e9e563ca85dbc2b71decf415009/32063452361.pdfIn PDF document text
- http://slp61.com/clients/e/e2/e296dcecfd7d10ffef0cc83fef253c72/File/giwoximugoxi.pdfIn PDF document text
- https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b32e22575ae---7797677712.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.

Filename	Kind	Source	Size
`font_00_sfnt_off00010fb2.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10FB2	11312 bytes
SHA-256: `57629e7ba80bdaf391a6754a4e0278609d689ae6951d5f0d0845c82050667c32`
`font_01_sfnt_off000129a1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x129A1	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off000141b3.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x141B3	16484 bytes
SHA-256: `c079a522cffbd19ed53a64c7c15a111e4378eac85b3ff0f32247d1605e3c022a`

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