PDF malware analysis — malicious · f3cdbe3700286cc5

MALICIOUS

PDF

83.6 KB Created: 2021-09-09 20:16:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11

MD5: 9cac15b5a47a40818da1c8a4ed389edb SHA-1: 204498f6255d9074219be1339db1d4bea82f47c7 SHA-256: f3cdbe3700286cc50bb237325027cc1c670b3abe7bea383cae6666dc8a36ddeb

196 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document exhibits characteristics of a phishing lure, directing users to external URLs that likely host malicious content or exploit kits. The heuristic 'SE_BROWSER_INSTALL_LURE' strongly suggests a social-engineering tactic to prompt the user into installing unwanted software or extensions. The presence of numerous external links, many pointing to potentially compromised or disposable hosting, further supports this assessment. While no scripts were directly extracted, the nature of the URLs and the lure indicate a high likelihood of a multi-stage attack involving exploitation or further payload delivery.

Machine Learning

Nyx PDF Classifier malicious score 0.9860

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://drafthe.ru/uplcv?utm_term=chrome+android+blue+check+mark PDF link annotation
- http://bk-plus.at/userfiles/files/32423249864.pdfIn PDF document text
- https://ethnicminorities.heephong.org/ethnicminorities/cmsadmin/ckfinder/files/74893067621.pdfIn PDF document text
- http://studiopassarotti.it/userfiles/files/1232132338.pdfIn PDF document text
- http://ipceurope.eu/assets/file/23008365321.pdfIn PDF document text
- http://canxetaidientu.com/images/file/22118435064.pdfIn PDF document text
- http://brenno-tojestto.pl/userfiles/file/96257629630.pdfIn PDF document text
- https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/jdgvtdp2d4161ckdnhghcod8f0/vubotamatujilapele.pdfIn PDF document text
- https://davidfoleyinc.com/userfiles/file/5509854001.pdfIn PDF document text
- https://koratspring.com/upload/file/50283230081.pdfIn PDF document text
- http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613651846d184---2151917590.pdfIn PDF document text
- https://srmhomes.com/images/bulk_images/files/vivakogevozubuwazudet.pdfIn PDF document text
- http://microcement.ua/userfiles/file/nobevaluxexage.pdfIn PDF document text
- https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/d17vr7j9grmp1javq69refit0r/24250931376.pdfIn PDF document text
- http://bige.vn/uploads/userfiles/file/36225864086.pdfIn PDF document text
- http://esistore.com/userfiles/file/20316521319.pdfIn PDF document text
- https://kirmatas.com/userfiles/file/56039124655.pdfIn PDF document text
- http://tongchangkj.com/uploadfile/file///2021090717490591.pdfIn PDF document text
- http://flemingdecal.com/uploads/assets/file/desusibafubesifimata.pdfIn PDF document text
- https://gamedunyasi.com/calisma2/files/uploads/mafob.pdfIn PDF document text
- https://ikuseikyokai.jp/ckmedia/files/54539046111.pdfIn PDF document text
- http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16131f80b9de85---40746917204.pdfIn PDF document text
- https://www.hermanosvalerorecio.com/ckfinder/userfiles/files/lasubepukatugobigom.pdfIn PDF document text
- https://www.abrasco.org.br/ckfinder/userfiles/files/61757745095.pdfIn PDF document text
- http://odesignlab.ru/admin/ckfinder/userfiles/files/75842874239.pdfIn PDF document text
- https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ede461a454b88de4aa5ea12e83a2b395/35641576592.pdfIn PDF document text
- http://gazduire-domeniu.com/UserFiles/file/judizu.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_off0000dd3b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDD3B	10732 bytes
SHA-256: `01484beffcfe8106188d0d8fca643821dbf5fe82c10a12676495861a5df5cb88`
`font_01_sfnt_off0000f59d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF59D	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00010daf.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10DAF	19588 bytes
SHA-256: `54b9f7e389e35f70bc58117f965b9388f2e2f02d37e6627e6e0aeb2567f9314a`

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