Malicious PDF — malware analysis report

Static analysis result for SHA-256 013d53308d53a3c9…

MALICIOUS

PDF

71.1 KB Created: 2021-08-04 18:34:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7cd1ed32704665915deb86d38dcce991 SHA-1: 6abf15b38790307cd7ca0a04c9afc242f23527ce SHA-256: 013d53308d53a3c9458c57f31a874299847e4ab3c63229373ec6d75605dee4f4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs pointing to compromised WordPress sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of JavaScript suggests it may be used to redirect users or further exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/16072a353e6f2c---86599943478.pdf In PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/ecb104bd2f0fc6d8ae17b94f27085de2/xufadilamakozos.pdfIn PDF document text
    • http://hungbuloon.com/media/ftp/file/xezufagapulogusudaxizon.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16107dcea8295b---4699070211.pdfIn PDF document text
    • http://badischer-kunstverein.de/ckfinder/userfiles/files/berot.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/2baedb4d1ff7032a08180cb0c659e24f/56869944726.pdfIn PDF document text
    • https://www.alphaveneers.com/wp-content/plugins/super-forms/uploads/php/files/86b4e4a5546755bb9872ae9e3a51f65b/gudetabidugodeda.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/2e8f7ce23755d378531f12ccf9604ff8/pobilovezobebivitobu.pdfIn PDF document text
    • http://citescolairedeledit.com/include/file/76288327262.pdfIn PDF document text
    • http://animalscipublisher.com/files/upfiles/file/zawukoxutipuderupepov.pdfIn PDF document text
    • http://gaishachuukobuhin.com/js/upload/files/zikonipipepes.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/ie54f0amjp6q85n25v3nves65t/31077451041.pdfIn PDF document text
    • https://harryfok.com/ckfinder/userfiles/files/58187736446.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/dnt7k6bk1g7ou6uqls0e4hrau2/lakanokawuwuzofaxebujebo.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1609c1f924506c---58096884061.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609492b42dfa9---7555080927.pdfIn PDF document text
    • http://shipsupply.ru/userfiles/files/dasidugudawow.pdfIn PDF document text
    • http://zulassungsservice4you.de/bilder/file/29282326575.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6e792db0ca---boxanifabipajixibopap.pdfIn PDF document text
    • https://dp-silver.com/userfiles/file/8297399644.pdfIn PDF document text
    • http://bright-inter.com/file_media/file_image/file/32491869259.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/16071a8376fba0---54878868897.pdfIn PDF document text
    • http://podiummoda.ru/userfiles/file/48152106205.pdfIn PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/g7ijofhapba7vuo593vnu9h8dc/84057292094.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=120+pcf+to+kn%2Fm3PDF link annotation
    • 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.

FilenameKindSourceSize
font_00_sfnt_off0000b9ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9CE 14724 bytes
SHA-256: 817edee1d4dd869db3936fdf79cebd854f50c941b8eb91f25c9bdf78c2f7caf7
font_01_sfnt_off0000deeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEEB 10436 bytes
SHA-256: 2c28d471485b1b84ad81346a06f0b23fb0596843b26c2774a7b0321a28002460
font_02_sfnt_off0000f6b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1