Malicious PDF — malware analysis report

Static analysis result for SHA-256 f56e71971a994973…

MALICIOUS

PDF

69.1 KB Created: 2021-09-26 03:29:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 05a3e17065fceb8c46451a75a0a3b108 SHA-1: 4e75fb871b4aab3fe8ebd31d7bc0d0ad7239605b SHA-256: f56e71971a994973fff3aa024ed2808191eabdce280d28552570761133f0da99
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or redirecting users to malicious sites. The presence of numerous external URIs, many pointing to compromised or disposable hosting, strongly suggests a link farm designed to distribute phishing content or malware. The ML classifier and ClamAV detection further confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://chcial.ru/uplcv?utm_term=free+streaming+for+firestick PDF link annotation
    • http://pekbdt.com/filespath/files/20210908144416.pdfIn PDF document text
    • http://bulmarconsult.com/files/peroxak.pdfIn PDF document text
    • https://fainitelecommunication.com/public/editorfiles/file/tumufopisudajek.pdfIn PDF document text
    • http://gelikonline.ru/content/Files/zoxefe.pdfIn PDF document text
    • http://ottomaniantextile.com/userfiles/file/lafizosope.pdfIn PDF document text
    • http://cukiernia.eu/upload/files/sowagabewudegagetuzemogod.pdfIn PDF document text
    • https://chingchia.com/uploads/files/202109221818383190.pdfIn PDF document text
    • http://prinsart.ro/uploads/files/mixuvamuvakowi.pdfIn PDF document text
    • http://krupongs.com/images/file/73518736987.pdfIn PDF document text
    • https://wyslijpaczki.pl/app/webroot/files/userfiles/file/xurojozovebi.pdfIn PDF document text
    • http://milwaukee.center/userfiles/file/kenobuxesotopitapapiroto.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/161494ce2854ff---89532876823.pdfIn PDF document text
    • http://nfc-lampang.com/user_img/files/10759837904.pdfIn PDF document text
    • https://manuscripthandler.com/userfiles/file/fujavaweraxagoduxapom.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/ae7f9779b19acabdb018f99b90f1fdea/numusiwigituzulubodudivo.pdfIn PDF document text
    • http://www.southforconstruction.com/frontend/web/ckfinder/userfiles/files/27133986397.pdfIn PDF document text
    • https://stancijanegrin.com/UserFiles/files/38681154211.pdfIn PDF document text
    • http://hokkaido-love87.com/app/webroot/js/ckfinder/userfiles/files/88286704030.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/2ca78ca4c68effaf61adccb0ebca462d/6147826375.pdfIn PDF document text
    • http://fra2ange.it/userfiles/files/74152744069.pdfIn PDF document text
    • https://optimumquestsolutions.com/ckfinder/userfiles/files/nasevoratijigoxokeb.pdfIn PDF document text
    • https://s-h.cc/uploads/files/202109072136572926.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_off0000ad00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD00 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c512.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC512 16388 bytes
SHA-256: 3552951ec2eba0762d49d0a70cb799a5e974e96b048c79c87b94f55c4e157c9b
font_02_sfnt_off0000ee87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE87 10704 bytes
SHA-256: c0bb9fa8d673fe2aa3cd68b5ecbd812966135d44b2f10a56e54fc37c67885c67

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