Malicious PDF — malware analysis report

Static analysis result for SHA-256 54a3ef9ad48132eb…

MALICIOUS

PDF

70.9 KB Created: 2021-08-14 17:06:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 6e123caa0c33b2a8d7d7de31a4aec828 SHA-1: 24e02c9e425f89f3f62cd91c59d8816c3d31d995 SHA-256: 54a3ef9ad48132eb87ad1206f995af44a2a83d8b576b9af2edc6b3dfcd60976e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of JavaScript points to its use in executing malicious actions or redirecting the user.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://coretry.ru/uplcv?utm_term=alphabet+majuscule+lettre+de+l%27alphabet+a+imprimer+et+decouper PDF link annotation
    • https://kcss.hu/korosi/userfiles/file/tavokozuwosowumusesagipe.pdfIn PDF document text
    • http://lakehighlandsrw.org/clients/863582/File/vizemeje.pdfIn PDF document text
    • http://memphiscentral1969.com/clients/865565/File/dosiwixovin.pdfIn PDF document text
    • http://cpgny.com/userfiles/files/8730591642.pdfIn PDF document text
    • http://2478.ru/admin/ckfinder/userfiles/files/15664712435.pdfIn PDF document text
    • http://minutemen-jrotc.com/clients/84940/File/45596509732.pdfIn PDF document text
    • http://sisparts.pl/zdjecia/fck/file/wojamimobugu.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16115910854fc9---majimarulesadagabamanegib.pdfIn PDF document text
    • http://strategie-online.net/catalogue_dynamique/file/51117662142.pdfIn PDF document text
    • http://sjhrz.com/images/upload/File/79508849329.pdfIn PDF document text
    • https://aradovan.com/userfiles/file/luliseli.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160909173a0289---bituwiz.pdfIn PDF document text
    • http://classiccar-jp.com/js/upload/files/xafidepefurolugolemujux.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/kvp8fkb4fc8lvidqrb33dj2up5/kefegawurirovij.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/9801e5d65c7bf3a01390fb86c87f4411/tudege.pdfIn PDF document text
    • http://www.ecostroyservis.ru/File/xesulawiwawujuwibega.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/47807383336.pdfIn PDF document text
    • http://sshs61.com/clients/6/60/60e739d5a8cf4a6710e4f064fd99417d/File/paduwevegazupotufapamame.pdfIn PDF document text
    • https://rubenoferro.com/userfiles/file/luvidanegosepeneku.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/fodogilizibovekinu.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/160a4e027d6a50---63123071397.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/db706f0b6fe2f2659a4432568a923882/reweniberevibobaje.pdfIn PDF document text
    • https://yellowstonewildlife.com/natokamagedesilurizo.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.

FilenameKindSourceSize
font_00_sfnt_off0000b677.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB677 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ce89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE89 14384 bytes
SHA-256: cacdb93e660f72fd66851094559711d0094b3a66b950e211c450d6a13a746712
font_02_sfnt_off0000f196.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF196 11060 bytes
SHA-256: b9df71032371d99e9009fe904725e78420243939e9f1cdaa122b720131b73215

Open this report in the interactive analyzer, or submit your own file for analysis.