Malicious PDF — malware analysis report

Static analysis result for SHA-256 c219e07cc838fc32…

MALICIOUS

PDF

84.1 KB Created: 2021-06-25 22:54:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 58908461af66e1a5d9ed12dcc770d293 SHA-1: 7b401aaccbba6d4e2d72769416f5f459a11b29fd SHA-256: c219e07cc838fc3276a1752b1accbc2ea27b10fff29970568426c1277cbe4d10
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains embedded JavaScript and numerous external links, some pointing to compromised WordPress sites and disposable hosting, suggesting an attempt to redirect users to malicious content or phishing pages. The presence of embedded JavaScript indicates a potential for further malicious actions beyond simple redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://press-centr.com/images/file/fabameranebu.pdf
    • http://mlkscholarshipsmilwaukee.org/clients/f/f0/f021f13c5c598389be7e913a1ae626ff/File/75659952546.pdf
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160be000bbd2fa---68413716222.pdf
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609f3e51c31a1---13914569675.pdf
    • https://rubin2000-distribuitorshop.ro/userfiles/file/favolejulafolikaxonuwe.pdf
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/16077952261340---mimemilebekiti.pdf
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/1606ff646e7f1c---xujasotiluvefaroga.pdf
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1c4098857---xelopel.pdf
    • http://espacioschillout.es/images/admin/file/31526281586.pdf
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160b24e776eb93---20438448494.pdf
    • http://quatang3t.com/upload/files/57165143967.pdf
    • http://adance0112.com/upfile/editor/file/98336130278.pdf
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084d07c1fabe---31521761036.pdf
    • https://toskov-yordanov.com/userfiles/file/16489037908.pdf
    • https://www.hausbootgeiseltalsee.de/wp-content/plugins/super-forms/uploads/php/files/jphe00lgsvlr8uvqfvggk4a461/83322807117.pdf
    • http://ubest.ru/images/file/xofejisovedakafuwomi.pdf
    • https://bangprice.combangprice.com/beta/cms_image/file/pixalaj.pdf
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1608cddb80ad6a---65960537510.pdf
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/36272cdc3b1e94797843f685f4da429b/wipemawov.pdf
    • http://edgewood1962.com/clients/2/2b/2b25cacec04995aba37d275b9c35b4d1/File/taditulit.pdf
    • https://damiel.eu/userfiles/file/81265067950.pdf
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16079085729938---begobedav.pdf
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/8cc0e7ac6c0fddc55671fb5a1bf1ab8c/kudozogapukogejarelum.pdf
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16078673d4e815---xonogapukugosuvepadurow.pdf
    • http://arserwood.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/2106060708167597142xdeud.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=diana+ross+and+lionel+richie+endless+love+lyrics
    • 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_off0000daeb.bin
f54112af72bb29f4e9288d348d766746791afede3524f2f01a3470b115a4590e
pdf-font-stream PDF embedded font (sfnt) at offset 0xDAEB 10552 bytes
font_01_sfnt_off0000f2e4.bin
71d71730be6b25a2de014c4bfe54b578ab1f54c3b57b8381ff0ec12570d3c38b
pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E4 22320 bytes
font_02_sfnt_off00012aad.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12AAD 16792 bytes