Malicious PDF — malware analysis report

Static analysis result for SHA-256 edd29665a0ce6b44…

MALICIOUS

PDF

83.7 KB Created: 2021-09-11 05:47:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f3975c7b526740b0d58e396959b67684 SHA-1: 7482a8b9d6a43e7ef2f428be05edfc24ba65371f SHA-256: edd29665a0ce6b44701ac9a0049bb7afd2be99d8b9dbb98996dfc720320ce9a4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution through these links. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • 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://beautydiction.com/ckfinder/userfiles/files/jobalomanijapijota.pdf In PDF document text
    • http://plechotice.sk/tmp/file/18530810677.pdfIn PDF document text
    • http://bangtutrang.com/upload/files/80152427627.pdfIn PDF document text
    • http://www.autoservis-hubatka.cz/admin/upload/ww/file/97588913096.pdfIn PDF document text
    • https://tagoproperties.com/ckfinder/userfiles/files/9924318005.pdfIn PDF document text
    • http://seoaudytor.pl/userfiles/file/votesizujoxuwadefojaro.pdfIn PDF document text
    • http://bunny888.com/ckfinder/userfiles/files/movagepoxadunopisinukuxo.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612fabd1dee2c---xaragigajadog.pdfIn PDF document text
    • http://hvezda-pardubice.cz/files/file/42393650985.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613ae51f24fa9---16758977359.pdfIn PDF document text
    • http://belovosushi.ru/files/57010230765.pdfIn PDF document text
    • http://elpijisystem.com/file/53807017965.pdfIn PDF document text
    • https://www.vek-bg.com/app/templates/js/ckfinder/userfiles/files/62150096185.pdfIn PDF document text
    • http://studiotecnicobonoli.com/userfiles/files/10034679785.pdfIn PDF document text
    • https://rosedreamholidayhomes.com/ckfinder/userfiles/files/3527447044.pdfIn PDF document text
    • https://redengewinnt.com/userfiles/file/66020031972.pdfIn PDF document text
    • http://blesk-stroy.ru/userfiles/files/21463698897.pdfIn PDF document text
    • https://harmony.im/userfiles/file/65324727666.pdfIn PDF document text
    • http://xn--oy2b19v1mb1yi.com/userfiles/file/72544343483.pdfIn PDF document text
    • https://vinaarc.com/app/webroot/files/ckfinder/userfiles/files/4334634220.pdfIn PDF document text
    • https://rireenfrance.com/images/upload/files/76025209114.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/lvgfd91dav9vr4jcqihhtfhuos/53615763013.pdfIn PDF document text
    • http://eros-arena.de/eros/userfiles/file/kukewasidezudapetu.pdfIn PDF document text
    • https://satuldelut.ro/ckfinder/userfiles/files/17927866671.pdfIn PDF document text
    • http://af.ssla.ru/images/fornews/files/xadebujenivomorura.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=mobile+legends+bang+bang+jungle+guidePDF 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_off0000e329.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE329 10588 bytes
SHA-256: 1602530992bab6ff92b7e800bedb8169437c9b55c7027767c294a5da5a7c5918
font_01_sfnt_off0000fb22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB22 17700 bytes
SHA-256: 9a078eb40c80ac333e08cf73dbe19b8c4fce975b13940c2d813e4882cd7df248
font_02_sfnt_off000128de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1