Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc6751c6a7f74b9c…

MALICIOUS

PDF

69.0 KB Created: 2021-09-26 11:43:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b80b701e18b416b73fd10e1813318275 SHA-1: 45124cbb548a9e4a5d475b8ea32c7123cd54bafb SHA-256: bc6751c6a7f74b9c82821f858772ab80bb263fad259310bc97558ee3ab61bc4a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for malicious PDFs to execute code. It also contains numerous URLs, many of which are hosted on compromised or disposable domains, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://huntic.ru/uplcv?utm_term=gift+wallet+apk+download PDF link annotation
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614f97d80d1f3---61753809259.pdfIn PDF document text
    • http://veterky.ru/ckfinder/userfiles/files/39516356356.pdfIn PDF document text
    • http://plkorea77.com/ckupload/files/zemuwidisomebilexosedig.pdfIn PDF document text
    • http://eviljoy.com/UserFiles/File/11067602269.pdfIn PDF document text
    • http://lctrading-gmbh.com/ckfinder/userfiles/files/43758498632.pdfIn PDF document text
    • http://turystyka.powiatlubartowski.pl/admin/ckfinder/userfiles/files/1342055988.pdfIn PDF document text
    • http://divelife.kz/files/file/37931031571.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/161462f285f36c---76843070682.pdfIn PDF document text
    • https://amoslodge10.org/ckfinder/userfiles/files/defenilizaroguzagaxigar.pdfIn PDF document text
    • http://villa-margherita.biz/userfiles/files/60857292776.pdfIn PDF document text
    • http://metabolit-plus.ru/files/file/soxewexopimo.pdfIn PDF document text
    • http://hoaisonland.vn/upload/files/xorixoben.pdfIn PDF document text
    • http://hanart21.com/files/userfiles/file/favuk.pdfIn PDF document text
    • https://bimore.vn/webroot/img/files/94486550139.pdfIn PDF document text
    • https://ls-machinery.com/uploadpic/files/202109071504283821.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/6ad16e793ebb5cd4118dbd0cbf00d8ee/73680468824.pdfIn PDF document text
    • https://hijaulumut.com/contents/files/26715544305.pdfIn PDF document text
    • http://ana-jsc.com/upload/files/norezewabuge.pdfIn PDF document text
    • https://globalathena.com/ckfinder/userfiles/files/1691732998.pdfIn PDF document text
    • https://my-natural-style.net/upload/files/30406805161.pdfIn PDF document text
    • http://akatumusics-ang.communication-pro.fr/public/1283/contenu/file/73244899197.pdfIn PDF document text
    • https://ozora.schaffsen.com/contents/file/jidisofejavuvixusowu.pdfIn PDF document text
    • https://www.assessment.unibe.ch/app/webroot/js/ckfinder/userfiles/files/zizububebuk.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_off0000ade7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADE7 10440 bytes
SHA-256: 5ab4c144e9c5fcc29fecd8afc54f755bcc64a500dc303e312faf9e9c4a931674
font_01_sfnt_off0000c5c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5C4 16228 bytes
SHA-256: 7e6bc542b79a7766dfe776a2b8d0999931b228ebac937f36b8251cce576d953d
font_02_sfnt_off0000eea6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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