Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ce331ffdbbaaee6…

MALICIOUS

PDF

82.5 KB Created: 2021-09-07 17:59:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: cea919b8a96870afeacae5c07bbd0609 SHA-1: 300512a7c5a4b8a7aeae6b4cc2b60612988e7379 SHA-256: 3ce331ffdbbaaee6bd51e20e5582f5b3757c4fdd0603b3af8d5f40d3c12b7735
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, many of which point to compromised websites or disposable hosting, indicating a phishing or link-farming attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious content or further stages of an attack. No scripts were extracted, and the document body was unreadable, limiting the analysis of the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • 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.
  • 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 http://olech-rzeszow.pl/userfiles/file/24103362386.pdf In PDF document text
    • http://rulife.ru/ckfinder/userfiles/files/52615850570.pdfIn PDF document text
    • http://arkystudio.eu/userfiles/files/60481368180.pdfIn PDF document text
    • http://www.multigacos.com/admin/uploaded/fck/file/sigowigomerovapulat.pdfIn PDF document text
    • http://k1a.ru/images/files/file/19126890274.pdfIn PDF document text
    • https://aakritidigitals.com/userfiles/files/nolomezaxomaka.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/82ea75d768433ea83a9efbfcb7f4e0e4/xoxabifasakux.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2eb28cc095---57416188902.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/6277074f8e826ff7410cc5994c40832b/57832662442.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c9865cd812---xatuzutafulusofere.pdfIn PDF document text
    • https://getracemirates.com/userfiles/files/xadimorulolu.pdfIn PDF document text
    • http://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16087ef1ee77e2---pibovexiwup.pdfIn PDF document text
    • http://rlmlaw.com/images/edit_images/file/70548952411.pdfIn PDF document text
    • https://swagath.co/new/ckfinder/userfiles/files/13260763420.pdfIn PDF document text
    • http://dui-antidote.net/images/userfiles/file/zevawatidovofefotofi.pdfIn PDF document text
    • http://www.chatanakonci.cz/userfiles/file/24021593848.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cde92f720de---2960529030.pdfIn PDF document text
    • http://grappin-annat-como.com/userfiles/grappin-annat-como.com/file/xubuvafozemadegolulanaxak.pdfIn PDF document text
    • http://creptiles.dk/userfiles/file/vovip.pdfIn PDF document text
    • http://lnianemarzenie.pl/userfiles/file/tosubofufo.pdfIn PDF document text
    • http://architettoletiziamasciotta.eu/userfiles/files/denipojexogof.pdfIn PDF document text
    • http://vivo-mebel.ru/upload/file/34052794491.pdfIn PDF document text
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/bae06a0b9f53663e36cd0c64549248c6/guzixuburuluwofiv.pdfIn PDF document text
    • http://berallebags.com/UploadFiles/FCKeditor/20210628100418.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=international+business+class+11+notes+pdfPDF link annotation
    • 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_off0000dceb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCEB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f502.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF502 10856 bytes
SHA-256: c944a2dc404467f435efd450ceca38925982aa10752f918aa1d31ebf69a2408f
font_02_sfnt_off00010e01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E01 18072 bytes
SHA-256: 660565947dcd287c4cf12958560d1751a725ac211734c78e991776079b5cd0f2

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