Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3567fcffc1b4b58…

MALICIOUS

PDF

86.1 KB Created: 2021-09-23 13:17:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8db12266f25f6307a911e1fc89ac1d11 SHA-1: 58e37b9abd75b4f37f9cd0eedb1b053c9c1bfaae SHA-256: b3567fcffc1b4b58ca1111e9039466b3fe198719ad819739941ce57b2ddb891d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The embedded JavaScript and numerous external URIs, including links to compromised CMS upload storage and disposable hosting, suggest an attempt to redirect users to malicious content. The primary goal appears to be phishing or malware distribution through a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://nomylo.ru/uplcv?utm_term=kimetsu+no+yaiba+mugen+train+watch+free PDF link annotation
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1612f1da98871f---66751311250.pdfIn PDF document text
    • https://people11people.gr/uploads/File/49192064140.pdfIn PDF document text
    • http://moiarchitekci.pl/pliki/file/61817854629.pdfIn PDF document text
    • http://kamkmori.cz/ckfinder/userfiles/files/xogenumenezobidufegamewux.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/ooljh7t8o9n3jbbtop7pcnnj11/24541466798.pdfIn PDF document text
    • http://newo.ru/files/files/73117170940.pdfIn PDF document text
    • https://atlastoursntravels.com/userfiles/file/kobegenuzomigo.pdfIn PDF document text
    • http://h-p-n.fr/catalogue_dynamique/file/38414452853.pdfIn PDF document text
    • https://montpellier-business-plan.com/mbp/upload/images/images/upload/ckfinder/lefelurazexolifekeka.pdfIn PDF document text
    • http://aviapartner.biz/js/ckfinder/userfiles/files/28662701147.pdfIn PDF document text
    • http://fmmvn.net/userfiles/files/24550883390.pdfIn PDF document text
    • http://allineers.morefriendship.com/upload/files/62658726769.pdfIn PDF document text
    • https://doucetplasticsurgery.com/ckfinder/userfiles/files/96249140034.pdfIn PDF document text
    • http://www.trisad.kz/ckfinder/userfiles/files/83067371043.pdfIn PDF document text
    • http://onlytech-tunisie.com/userfiles/file/15500771531.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/fbqf1ng9qgd0hjp51o4dte2s90/30588855482.pdfIn PDF document text
    • http://climtech.com/files/files/95418818169.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1614690142dee3---3325954762.pdfIn PDF document text
    • http://www.ufolep-69.com/contenus/files/pijimirapujebotekari.pdfIn PDF document text
    • http://thangmayedex.com/webroot/img/files/57812917391.pdfIn PDF document text
    • https://vinasimex.com/uploads/file/61929873499.pdfIn PDF document text
    • http://sahrugs.com/userfiles/file/21443294901.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/161442db9051d7---9281848500.pdfIn PDF document text
    • https://ijtm.in/userfiles/file/18225037137.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_off0000ebdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBDB 16980 bytes
SHA-256: c89743ec39924b4e7493d59f3b8feff731856bb094ab8d082bbceed3ee235613
font_01_sfnt_off00011838.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11838 11168 bytes
SHA-256: 117ede8bf60ca2aa6e81b03315ed046adc15d057c1018c77c08626b0805320f8
font_02_sfnt_off00013248.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13248 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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