PDF malware analysis — malicious · 0bfc4d9a8e2bf62b

MALICIOUS

PDF

74.5 KB Created: 2021-09-22 21:48:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: a452d57c92e7a9277f5d0b3c5fd965b8 SHA-1: 634106932364625b740be17048246cd6e6a22353 SHA-256: 0bfc4d9a8e2bf62b8af5057e48b9c5b20bf8008531bda843fa55d3622f225611

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and link farm characteristics points towards a phishing or malware distribution attempt.

Machine Learning

Nyx PDF Classifier malicious score 0.9840

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://laborke.ru/uplcv?utm_term=the+secret+of+divine+love+pdf+free+download PDF link annotation
- https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136e7308dc1d---69038779847.pdfIn PDF document text
- http://music-saikung.com/ckfinder/userfiles/files/5558697897.pdfIn PDF document text
- https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613d7a2232b12---85782936157.pdfIn PDF document text
- https://actorconseil.com/files/file/99184613830.pdfIn PDF document text
- http://dymenahealthcare.com/upload/fckeditor/file/96208951868.pdfIn PDF document text
- http://hoclaixebinhthuan.com/upload/contentFile/file/nigubegove.pdfIn PDF document text
- http://greenlivinggarden.com/htdocs/UserFiles/file/48046365641.pdfIn PDF document text
- http://inarchengineering.it/userfiles/files/78158989063.pdfIn PDF document text
- https://tybistanbul.org/resimler/files/42168070578.pdfIn PDF document text
- http://simpelms.nl/userfiles/files/99442334144.pdfIn PDF document text
- https://eownauto.com/uploadpic/files/kovopodutakuwefurodupixev.pdfIn PDF document text
- https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/5a4ea46soj94a3e9ovbn5m9o6n/13610534258.pdfIn PDF document text
- http://reelproductionshd.com/userfiles/file/53793210860.pdfIn PDF document text
- http://gustosandvic.com/ckfinder/userfiles/files/vaxak.pdfIn PDF document text
- http://connectcontrol.net/files/userfiles/files/mefurowakamulamupo.pdfIn PDF document text
- https://tahuacoop.com/cms_gpadmin2015/sgi_userfiles/userfiles/files/lejokuwuxesidodide.pdfIn PDF document text
- http://1-champagne.com/blog_images/blog_/file/bekegoxujup.pdfIn PDF document text
- http://equipociclistaugeraga.com/ciclistas/userfiles/file/gubukadegenasekufav.pdfIn PDF document text
- http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/161464fd9c1340---jisekowepelivoweli.pdfIn PDF document text
- http://smartvoicecom.com/userfiles/sunazuli.pdfIn PDF document text
- http://ilkjv.com/Images/Media/files/64367754561.pdfIn PDF document text
- http://dongphat.net/upload/files/relaxerivenisuvejofaxilux.pdfIn PDF document text
- http://albino-pitti.com/pub_img/file/raginisitarate.pdfIn PDF document text
- http://ingore.cn/upload/files/vunizigizepoko.pdfIn PDF document text
- https://hram-uspeniya.ru/ckfinder/userfiles/files/69181204261.pdfIn PDF document text
- http://eluvial.com/sites/all/sites/eluvial.com/files/sodonovuz.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_off0000bea0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xBEA0	10832 bytes
SHA-256: `591620ded762a22db7f20e89d72ff9972887d4fb8c196217ce46ee45c92afc0a`
`font_01_sfnt_off0000d7a7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD7A7	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0000efb9.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEFB9	17128 bytes
SHA-256: `7b93041e526efb8b9d619c284dc687de2183915d87b3cfaf5d3eebdb68d87306`

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