Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9b3c25f96a4a778…

MALICIOUS

PDF

73.2 KB Created: 2021-09-13 20:26:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: bf74978c552db35d5ff2c07e68d2bb55 SHA-1: 23375886fe969d53fadc3987c0faba2d0ed66119 SHA-256: e9b3c25f96a4a778852ece27b16fc8429fd6d313515e8d9713537f7cd15bc87a
224 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external links, many of which are hosted on disposable domains or compromised sites. The heuristic 'SE_SECRET_RECOVERY_LURE' strongly indicates a phishing attempt to obtain private keys or recovery secrets. The embedded JavaScript likely facilitates the redirection to these malicious URLs or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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://allytemp.ru/uplcv?utm_term=private+key+required+to+install+a+certificate+android PDF link annotation
    • https://viktorina.ledoritulys.lt/files/22222831544.pdfIn PDF document text
    • http://gunjanjain.com/app/webroot/js/uploads/files/vanuxajefolabuzexofem.pdfIn PDF document text
    • http://greenglobepms.com/uploads/82842307658.pdfIn PDF document text
    • https://openkomm.yussfone-crm.com/userfiles/file/tapot.pdfIn PDF document text
    • https://xn--23-6kci4asohe8k.xn--p1ai/userfiles/file/54962288174.pdfIn PDF document text
    • https://quangcaowebsitecomvn.xemlaco.com/uploads/files/sofowusujupujavodubu.pdfIn PDF document text
    • http://bowie.abwingsmd.com/uploads/files/pebozoma.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/2kb1sgd4kqcg7cnca9773n0nc1/xesos.pdfIn PDF document text
    • https://alperbehang.nl/userfiles/file/59602196931.pdfIn PDF document text
    • https://khogiaydantuonghanquoc.com/images/news/file/bolubabuxedo.pdfIn PDF document text
    • http://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.com/ckfinder/userfiles/files/47582763067.pdfIn PDF document text
    • http://7m-shop.com/userfiles/file/80604018983.pdfIn PDF document text
    • http://baodieptailor.com/uploads/2021-09-02/images/files/rutese.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1613d44aecbc94---2456726247.pdfIn PDF document text
    • https://pecsikult.hu/files/file/92893742156.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-9-13/20210913071946546041.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/16139d3da3e591---66796431231.pdfIn PDF document text
    • http://dharmapuridiocese.com/svnprojects/DHD/Source/images/files/84590128013.pdfIn PDF document text
    • http://camelliafb.com/uploads/files/202109080411087784.pdfIn PDF document text
    • http://uitvaartverzorgingsindex.nl/images/uploads/jukaw.pdfIn PDF document text
    • http://mwbright.com/upload_fck/file/2021-9-8/20210908063845828675.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_off0000b875.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB875 17564 bytes
SHA-256: 522fda106f181e5247782c6937d6df30eb3777dcb4f180b85d0d383b339e61ac
font_01_sfnt_off0000e579.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE579 10988 bytes
SHA-256: 82368feb44e4059c1c45f9d2daff574137087022d1ed060caa476e58a94514ba
font_02_sfnt_off0000fefa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEFA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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