PDF malware analysis — malicious · 37ffe5684bbc2fa2

MALICIOUS

PDF

77.5 KB Created: 2021-09-01 11:31:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: 2ed264535c301b2f8b22a6dbd9898b41 SHA-1: 089b71b6258b65efc27f536a2b3ffab7094e566f SHA-256: 37ffe5684bbc2fa253995a4d98e23ff0de00a0d179096fb742a144085c42da02

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to various domains, many of which appear to be compromised WordPress sites used for hosting PDF files. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for link farms, suggesting an attempt to manipulate search engine results or redirect users to malicious content. No scripts were extracted, but the presence of numerous external links strongly suggests a phishing or malicious redirection attempt.

Machine Learning

Nyx PDF Classifier malicious score 0.9908

Heuristics 6

ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
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://archism.ru/uplcv?utm_term=nick%27s+hot+dogs PDF link annotation
- https://www.leadercaravans.com.au/application/third_party/ckfinder/userfiles/files/45141687301.pdfIn PDF document text
- https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/a2ed1d6401916f34073f054119017101/tevexoras.pdfIn PDF document text
- https://limadelimon.com/images/file/15238664503.pdfIn PDF document text
- http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/96c9f3e96172a32e68a2fd293a1f6036/zujizutatujujupole.pdfIn PDF document text
- http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a47dbf17402---87201483186.pdfIn PDF document text
- http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0b98377793---29813754882.pdfIn PDF document text
- http://harc-ias.vn/Images_upload/files/guraregegesidewirudemuma.pdfIn PDF document text
- http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16077c0d9ea31f---97182214047.pdfIn PDF document text
- http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a1236551118---nimutenamaradizitaletig.pdfIn PDF document text
- http://tandprotheses.com/ckfinder/userfiles/files/gisobebawosifexaji.pdfIn PDF document text
- https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/045f051323841de6cc35fd5d5f41d1d8/jiwujabejoporutabu.pdfIn PDF document text
- http://nuklearmedizin-amro.de/userfiles/file/60890174666.pdfIn PDF document text
- http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160902a125d22f---numopatu.pdfIn PDF document text
- https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c043a1e551f---71671165198.pdfIn PDF document text
- https://evenimentecastel.ro/wp-content/plugins/super-forms/uploads/php/files/mhks79ujqvchh4v058ulqvsk4t/zovigabinekunojusota.pdfIn PDF document text
- http://gibisch.biz/files/files/46473669129.pdfIn PDF document text
- http://alphabodysupplements.com/newerac2c/userfiles/file/31538277055.pdfIn PDF document text
- https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/405f04a8ffff7d28a4a65ce5e8fc17b9/91782236700.pdfIn PDF document text
- http://alibabashipping.com/userfiles/file/vuporokipafexuwavavegex.pdfIn PDF document text
- http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/1609fcb156489e---43823801270.pdfIn PDF document text
- http://coaching-scolaire.net/userfiles/file/1606731743.pdfIn PDF document text
- http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d0a7e6daaa6---3311352127.pdfIn PDF document text
- http://yjbiotech.cn/upload/files/53628316862.pdfIn PDF document text
- http://brenna-ski.pl/userfiles/file/44429762231.pdfIn PDF document text
- http://www.rotudavid.com/ckfinder/userfiles/files/durilemunovasa.pdfIn PDF document text
- http://campfirewtx.org/userfiles/file/82487801191.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_off0000caf8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCAF8	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000e30a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE30A	17532 bytes
SHA-256: `fb3e04286f1e2b14ad580b8e5eaadd74d884a006ff2a5ba4f772b7d6232aa747`
`font_02_sfnt_off00010fe2.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10FE2	10208 bytes
SHA-256: `707c123e037dc6eaf19685981abe00cdfa8dc210ed7eab6b61fdf960d4c13b27`

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