Malicious PDF — malware analysis report

Static analysis result for SHA-256 f78c03fe866501b9…

MALICIOUS

PDF

82.7 KB Created: 2021-09-23 13:52:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7b9776ddb5098211b83422d5a932d2b9 SHA-1: 5cc9b1e8385aaa14d9f50c838dcf1cee561a9f0e SHA-256: f78c03fe866501b957912921bf14cc113593eb6d4cf31c0278863f7ac5cee75c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and a large number of external links, many of which point to compromised websites or disposable hosting. The embedded JavaScript and the link farm structure suggest an attempt to redirect users to malicious sites, likely for phishing or malware distribution. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 https://krisoc.ru/uplcv?utm_term=the+hitman%27s+bodyguard+full+movie+english PDF link annotation
    • http://medicaldistri.com/ckfinder_files/files/30582446919.pdfIn PDF document text
    • http://hanasushichoice.com/uploads/files/11486956831.pdfIn PDF document text
    • https://adtw1.elfjane.com/ckfinder/userfiles/files/figoranobanomofuxat.pdfIn PDF document text
    • http://nieruchomosciklodzko.pl/files/file/80934750188.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/2949ef7ba38dacbfbfd1e808b466610f/5733919758.pdfIn PDF document text
    • https://szallas-karpatalja.net/upload/59209587519.pdfIn PDF document text
    • http://dfanchem.com/upload/files/45941820208.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/43979849474.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/161436aaccb4c6---sisenakifamudokupov.pdfIn PDF document text
    • http://www.mbk-montage.nl/ckfinder/userfiles/files/68642386814.pdfIn PDF document text
    • http://vlaamspatientenplatform.be/_plugin/ckfinder/userfiles/files/vesejibewexap.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/hpbvarktjuq9gvdaahkfqmqqm7/93146815968.pdfIn PDF document text
    • http://schubert-hh.de/image/file/23398538647.pdfIn PDF document text
    • https://myreply.mobi/snappshott/editor//file/jeluwaxiju.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ea639db87f---getiwakuboze.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/e1234f64744dcf34498c7635f4688c82/zexuvazuxagenematatalini.pdfIn PDF document text
    • https://aqua2go.pl/galeria/file/76734867100.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/393afe698c3f63914d8d895762df1c7d/toxipaniviva.pdfIn PDF document text
    • https://maximatrimony.com/ckfinder/userfiles/files/rosakepeliserujajizexumes.pdfIn PDF document text
    • https://gallerylingard.com/uploads/file/77561553325.pdfIn PDF document text
    • http://harposwebdesign.nl/app/webroot/files/userfiles/files/fiwedo.pdfIn PDF document text
    • https://noventa.cz/media/files/file/15437958309.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_off0000dc5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC5F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f471.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF471 17812 bytes
SHA-256: a04bd7f142e97b2eb8995c676b577935eefe435b2aada5aadf0c31b8339f55ed
font_02_sfnt_off000122e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122E4 11220 bytes
SHA-256: 111adf3c4eaf790dd614c35fa5ebbda185669f87a8a7902113bf0cbd99f2558f

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