Malicious PDF — malware analysis report

Static analysis result for SHA-256 53a430e383eafbc1…

MALICIOUS

PDF

68.7 KB Created: 2021-09-24 23:28:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: face75098782d7a72e2a1472b5624f2b SHA-1: 5b55560608851c3c681b3ffe5e61d76012722691 SHA-256: 53a430e383eafbc1c2715a70c84d57bea246d43cf53303a760052c78c1c4da40
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised WordPress sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution through these links. The embedded JavaScript may be used to further obfuscate the malicious activity or initiate a download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://proclima-membranes.ru/userfiles/file/82923991103.pdf
    • https://ever.dacola.com/upload/files/wopinamabativenalakudefuk.pdf
    • http://jumpstart.mobi/ckfinder/userfiles/files/54841186248.pdf
    • http://karat-dobremiasto.pl/userfiles/file/zudezelikebatozaxub.pdf
    • http://islaminkiel.de/webmisr/uploadwebmisr/file/musetovesikat.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613da8bca4cfb---zonumopatopipikaf.pdf
    • http://bfcy88.com/uploads/files/xamadejuvudefivokuwez.pdf
    • http://www.accl-calibration.com/login/ckfinder/userfiles/files/pojenabefefuz.pdf
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1613310481ca63---52695491939.pdf
    • http://herningbadintra.dk/app/webroot/upload/files/janone.pdf
    • http://designbyjoseph.com/uploads/File/70462016373.pdf
    • https://artistaone.co/userfiles/files/96484644240.pdf
    • https://www.pollackmihalyiskola.hu/ckfinder/userfiles/files/vodidebamufajik.pdf
    • http://teleinwestor.com/userfiles/file/7329545256.pdf
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/2bdd167c387f88cc892a810378d3e66c/boromemafimovuvis.pdf
    • http://www.icf-plant.com/files/file/99950966329.pdf
    • http://vakoplus.cz/klienti/devel/sneznerolby.cz/ckfinder/userfiles/files/nemagotok.pdf
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16138397d095f8---81247837312.pdf
    • https://solelane.com/ckfinder/userfiles/files/21460357257.pdf
    • https://sanaspinler.com/calisma2/files/uploads/resebakogipetifowitobujow.pdf
    • http://slbreakingnews.com/ckfinder/userfiles/files/67950274816.pdf
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/8d3477471e8f33d534f55f6ad1ceff20/kixipofogeza.pdf
    • https://sfasg.jp/js/ckfinder/userfiles/files/15979068166.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=react+native+android+apk+build
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000af1f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xAF1F 16792 bytes
font_01_sfnt_off0000c736.bin
9e3da710bb4f9b5bbf061ed1c9fc0404ba673b749e8ba99231a84c21f1e92081
pdf-font-stream PDF embedded font (sfnt) at offset 0xC736 10784 bytes
font_02_sfnt_off0000dfeb.bin
aafd3b716cdb6d2460aa13f8152f630041a61af0985f407aaddbf48e7c02248c
pdf-font-stream PDF embedded font (sfnt) at offset 0xDFEB 14924 bytes