Malicious PDF — malware analysis report

Static analysis result for SHA-256 845114f5cdb8120c…

MALICIOUS

PDF

78.8 KB Created: 2021-09-03 03:22:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1322f9d4ce4e860593d3e42d23e1944e SHA-1: e8df6ca81ba6b6cd0b9f6dedf666e0848eacf0e5 SHA-256: 845114f5cdb8120c1f42bd816231ea102fff6a238e0f3ed630eae9e20b752314
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://queure.ru/uplcv?utm_term=signs+and+symptoms+of+psychiatric+disorders+pdf PDF link annotation
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/4e318723b09603257c2677dbd36082ec/luturaluzekafev.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/16085ae6aa5e04---60315213723.pdfIn PDF document text
    • https://askopenko.com/wp-content/plugins/super-forms/uploads/php/files/0ce2b4d1c4eb2cc1c280f5f1d0ce8be4/wimejazilog.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/0bcb55212ca6f3e21de5118389f8ba1e/zobolaxodaweremesodugat.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16095790155c93---laxiponilatufo.pdfIn PDF document text
    • https://catwalkdogcome.com/editor_upload_image/file/fewipebalavuniwilexib.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e6d2e612f1---44015311696.pdfIn PDF document text
    • https://rent-1.es/ckfinder/userfiles/files/nakefozizurikoduwudi.pdfIn PDF document text
    • http://apartamentykunickiego.pl/architekci/public/upload/ckfinder/userfiles/files/tomob.pdfIn PDF document text
    • http://sindikat777.ru/ckeditor/ckfinder/core/connector/php/uploads/files/82776696623.pdfIn PDF document text
    • https://sedefartphotography.com/resimler/files/71549588001.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/e96355222f9ca40c325ae6f518295286/25108489288.pdfIn PDF document text
    • http://antonio-pelella.eu/userfiles/files/68781246783.pdfIn PDF document text
    • https://glaze-metalart.com/upload/files/28260926749.pdfIn PDF document text
    • https://contabil-fiscal.ro/mm/file/65178485387.pdfIn PDF document text
    • https://o2opr.co/userfiles/files/48243694250.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e7e1aefd1e---82169858758.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/09600624f632f6a8d7ba06f190d29506/zozosojozefovilomugulup.pdfIn PDF document text
    • http://cga82.com/admin/File/buzuvapibo.pdfIn PDF document text
    • http://www.prodomasa.com/ckfinder/userfiles/files/bulibelejuk.pdfIn PDF document text
    • http://yanartextil.com/firma/files/rorazoto.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/t2doeubhj52d4rcs5sa0hati01/nawukitanovokisoguruvami.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160c491418b20b---xapote.pdfIn PDF document text
    • https://satbietthu.com/luutru/files/jivaligevitisesire.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_off0000cca2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCA2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e4b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4B9 11208 bytes
SHA-256: af241b1c737027b64da2aba2e0745982cb1d898990809b97746500434bff1c88
font_02_sfnt_off0000fe98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE98 17932 bytes
SHA-256: f7a319e8eb29cc84d039b54d52ab3713d0f4e5121494dd74dcb43323cf81378e

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