Malicious PDF — malware analysis report

Static analysis result for SHA-256 57f95058e49ca515…

MALICIOUS

PDF

80.8 KB Created: 2021-08-19 06:29:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d0c1a51b0cffcb64591b95286b116841 SHA-1: c5951bb77433c700a1bb898d29aef2d1eaa58eae SHA-256: 57f95058e49ca51568bc36c41dec260f2e833d40e7da3ff1f2e1801e8ffd050f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to various websites, some of which are hosted on compromised CMS platforms. The primary purpose appears to be directing users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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.
  • 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://www.engltg.com/wp-content/plugins/super-forms/uploads/php/files/f53184f6e87b9787385ea1933bce0e3c/jinigemejirexakan.pdf In PDF document text
    • http://edu-family72.ru/content/images/uploads/file/49005044324.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/jp3vr5qbncdmusdq5tiukk1fdk/28780272280.pdfIn PDF document text
    • https://muacash.com/webroot/img/files/65993319771.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/3fa6f9e99dacb546be454deeadda1638/zonatokavowunidupesut.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/34beb01b80a6091d9978bb2577e8490e/dajodozabedivabob.pdfIn PDF document text
    • http://apricomm.com/userData/board/file/losopipiludove.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/91q1a3ivabjqbvvp4d409h4h62/vilabaravoluxi.pdfIn PDF document text
    • http://movitecnic.fr/ressource/site-image/files/fudasuraru.pdfIn PDF document text
    • http://wignaccent.com/FCKeditor_2.6.3/userimages/file/20210623111807.pdfIn PDF document text
    • http://dolphinegypt.net/userfiles/file/99350945838.pdfIn PDF document text
    • http://kapalishakti.com/ckfinder/userfiles/files/83766773122.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-6/file/54296855477.pdfIn PDF document text
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16088240468e7d---senobasixatavatezetino.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16100507988f98---matepipi.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fddf8ec832---waserejexor.pdfIn PDF document text
    • http://podiummoda.ru/userfiles/file/susojagekuwusetuwog.pdfIn PDF document text
    • https://internationalmedia.com/userfiles/file/wozaresarabajox.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/sf4fchilu4egcqg8bjur8pchb3/153124712.pdfIn PDF document text
    • https://bedandbreakfastchia.it/userfiles/file/nibanonij.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/ea2n77eoi0jhv0uci9u60hvu04/7128471380.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/c7thg6e6bskb3kl4refftehknm/sugapikezopijanekorali.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=hippopotamus+for+xmas+lyricsPDF 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_off0000d479.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD479 17808 bytes
SHA-256: 4678982da369c5eb284e52e35b58b58278c3206a34c847e891c3fa404e068c96
font_01_sfnt_off00010279.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10279 10712 bytes
SHA-256: b12d73ebd05a3a87a71b4f35cc1c1619fbbd6ec98687075b00e7de27be0c2da8
font_02_sfnt_off00011b27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B27 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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