PDF malware analysis — malicious · a1cd015e4c0f530b

MALICIOUS

PDF

99.9 KB Created: 2021-08-14 14:49:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24

MD5: f8f15ed64de98842572a4347cf3df7e0 SHA-1: ca73a14ca6cfa80ad1901a308013c99faa2809f6 SHA-256: a1cd015e4c0f530b9575cf1feb526e16f51d22983480d2195f94a3c877f5a9ce

196 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document employs a social-engineering tactic, presenting a lure to install a browser extension or update, which is a common method for credential theft or malware installation. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded URLs and link farms suggest the document is part of a phishing campaign, likely directing users to download a malicious payload or visit a credential harvesting site.

Machine Learning

Nyx PDF Classifier malicious score 0.9979

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
Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE

Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
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://laborke.ru/uplcv?utm_term=how+to+pay+asb+using+maybank2u PDF link annotation
- https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8b0c25b182---petatedatek.pdfIn PDF document text
- https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a87ab34a927---28298532573.pdfIn PDF document text
- https://sudhirsachdevaclasses.com/ci/userfiles/files/6619422734.pdfIn PDF document text
- https://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/8d70f6891588598ae18ab8776fd4403e/6534790174.pdfIn PDF document text
- http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160f5e8cec49f8---fulazepirujo.pdfIn PDF document text
- http://adamslakeband.org/userfiles/file/pufogumudopebamisufebelu.pdfIn PDF document text
- https://bio-obst-und-gemuese.de/userfiles/file/41812311676.pdfIn PDF document text
- http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608b356d5e50c---6950959691.pdfIn PDF document text
- http://aelma.com/sites/default/userfiles/file/jijajujigewavedurutenu.pdfIn PDF document text
- http://baobianhkhang.com/upload/files/pixuzofekizenesigewo.pdfIn PDF document text
- http://hydrem.ru/images/file/kajib.pdfIn PDF document text
- https://postelezmasivu-ostrava.cz/ckfinder/userfiles/files/gexujezoginabigovudinu.pdfIn PDF document text
- http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16091a19c79b08---53098190841.pdfIn PDF document text
- http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/1608c752e9552f---68710088733.pdfIn PDF document text
- https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/q08djjvfkj721sve9bmg6plfcc/91286014997.pdfIn PDF document text
- http://jmestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/18380562923.pdfIn PDF document text
- https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab0705c0c24---xuzunufaw.pdfIn PDF document text
- http://bertoniamministrazione.it/bertoni/public/file/68492921855.pdfIn PDF document text
- https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/9f990f19759df064f67d510c50c722c5/1536414947.pdfIn PDF document text
- https://visionbrindes.com/admin/fckeditor/userfiles/file/pamafirubarofimubido.pdfIn PDF document text
- https://bayardplaza.co.uk/wp-content/plugins/super-forms/uploads/php/files/stvlm3fcb41t7acj5brsm5hhgk/zomarawaluki.pdfIn PDF document text
- http://julianowka.pl/ckfinder/userfiles/files/nafejunorozebisimu.pdfIn PDF document text
- http://yarpb.ru/pic/userfile/bavavavoge.pdfIn PDF document text
- https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfd0ddf29a9---48383923069.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_off000122e0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x122E0	17196 bytes
SHA-256: `092b543d263b623b9bdd39592786e1f4879a002c53aeec329b575cf7e8a207d6`
`font_01_sfnt_off00014fca.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x14FCA	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off000167e1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x167E1	10960 bytes
SHA-256: `0138f688b78be89a1a847d7d1c822746f2559f05d4f40e072c9a2562687960be`

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