PDF malware analysis — malicious · 7e21b98b6dd5be3a

MALICIOUS

PDF

82.6 KB Created: 2021-09-18 02:21:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12

MD5: 25bdbd8696981178bdacdaefae39ce16 SHA-1: a42a04931dcb8dce7318d1d801676c7039292755 SHA-256: 7e21b98b6dd5be3a9a347af3aac3c5b9bbcfe4072ad4e3160ba2649889f22e5a

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Numerous external URLs are embedded, suggesting a phishing or malware distribution scheme. The presence of PDF-specific heuristics like 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports the attack pattern of luring users to potentially compromised or disposable hosting sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9974

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://laborke.ru/uplcv?utm_term=chat+group+pakistan PDF link annotation
- http://neteyes.eu/editor_up/wexexabogexegiwogimimusu.pdfIn PDF document text
- http://trungtamdaykem.vn/Images_upload/files/8668108966.pdfIn PDF document text
- https://evergreencans.com/userfiles/file/28795661760.pdfIn PDF document text
- https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/45fb987cb90ad279048b1e4af2db4d8e/gorutejetewomewidofe.pdfIn PDF document text
- https://cailux.lu/userfiles/files/61025183646.pdfIn PDF document text
- http://www.libroparlatolions.it/backoffice/ckfinder/userfiles/files/xusutimubajimoziviw.pdfIn PDF document text
- http://sjhtractor.com/d/files/fuvuwokutozeponozowadil.pdfIn PDF document text
- http://dailygameresult.com/editor/UserFiles2/files/6117427207.pdfIn PDF document text
- https://abhrian.com/userfiles/files/buwax.pdfIn PDF document text
- http://goldenpeak.it/userfiles/files/73023126148.pdfIn PDF document text
- https://rendszergazda-cegeknek.hu/ckfinder/userfiles/files/18939045019.pdfIn PDF document text
- http://zekidilektekstil.com/images_upload/files/tenitafanelaziju.pdfIn PDF document text
- http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613390ce4aaaa---64654679423.pdfIn PDF document text
- https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/gdmp80995ltv3dc5gfffb243s4/95713035256.pdfIn PDF document text
- http://ajtoablakcentrum.com/_user/file/81703082797.pdfIn PDF document text
- http://coming-c.com/userfiles/file/wudenudun.pdfIn PDF document text
- http://cosmeticdermatologymiamibeach.com/uploads/data/files/89881424300.pdfIn PDF document text
- http://ayrh.internet-match.com/upload/files/rufize.pdfIn PDF document text
- https://takipcisec.com/calisma2/files/uploads/sebik.pdfIn PDF document text
- https://ariconium.cz/webpagebuilder/ckfinder/userfiles/files/xutokeroberinel.pdfIn PDF document text
- https://motodubai.com/uploaded_images/files/75886705455.pdfIn PDF document text
- https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16136be8a55dfa---11529877518.pdfIn PDF document text
- http://ugyvednok.hu/userfiles/file/46543687567.pdfIn PDF document text
- https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/83jt3o7ce8vrfamcbre1903fs0/witevalisiparabidezuwora.pdfIn PDF document text
- https://rt9.rspo.org/ckfinder/userfiles/files/86142530602.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_off0000de71.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDE71	10576 bytes
SHA-256: `05ac774023fcb3d9427d188904bafc2e12e302ec558d56c9e9f768906a3515bf`
`font_01_sfnt_off0000f69d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF69D	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00010eaf.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10EAF	17560 bytes
SHA-256: `6bed7c94f94465584675c461d79c57f099a0ce83d2712a73257d9833e4314d56`

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