Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cb0fe5cf30539ae…

MALICIOUS

PDF

160.6 KB Created: 2021-07-13 16:50:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: a05935f9024cf63111d7eb64ada80dd2 SHA-1: 5c07a0d08c9da4029a5860fb0b02cc7ea74a0a8f SHA-256: 1cb0fe5cf30539ae93dbf6a21de540bfdf3de2956407cd6e92e53706b45b72ff
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to compromised WordPress uploads and disposable hosting sites, suggesting a link farm designed to redirect users. The presence of embedded URLs and the PDF structure point towards an attempt to exploit vulnerabilities or deliver phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9904

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://krisoc.ru/uplcv?utm_term=perry+mason+the+case+of+the+rolling+bones PDF link annotation
    • http://cortabellanews.com/userimages/sovabetide.pdfIn PDF document text
    • https://vsetinrally.cz/userfiles/file/diwimitukiroz.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160c74cf79ff8a---15041698628.pdfIn PDF document text
    • http://macap.nl/app/webroot/files/userfiles/files/xidixetulumobiruxifu.pdfIn PDF document text
    • https://laserbeautymachine.net/d/files/xixasovupotalo.pdfIn PDF document text
    • http://dgjst.com/upfile/file/xifufasaliw.pdfIn PDF document text
    • http://wamer.org/userfiles/file/rilulodusozito.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/3f95d14165e164657a167c61041939a2/45020866965.pdfIn PDF document text
    • https://plasy.com/uploads/file/97888873932.pdfIn PDF document text
    • http://wittlich-luexem.de/userfiles/file/xogoporesuposozupifemug.pdfIn PDF document text
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1607c31a90c7f5---jeredojesizutu.pdfIn PDF document text
    • https://anjingliar2.com/contents//files/62424099798.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/4bbhq7hsl08b6voc0iqcn5rin0/xusapubobiw.pdfIn PDF document text
    • http://dmhu.eu/uploads/uplib/file/digazutesidixuxopukuruko.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/160745d95d1bd2---pajumapixezofafutujig.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077ceedb7ea5---jegulogufuralinag.pdfIn PDF document text
    • https://shiokerbau1.com/contents//files/kojun.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b75eeb03005---7406738010.pdfIn PDF document text
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/4ed3cb846f9609fe6bafd367ea88cc54/kabaso.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1609e2aaf5c109---48753188313.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/99069679690.pdfIn PDF document text
    • http://alacarte-design.de/userfiles/file/wesegudatipibezazig.pdfIn PDF document text
    • http://beijinghuojia.cn/userfiles/file/78601046119.pdfIn PDF document text
    • https://aquafilling.com/userfiles/file/gulesogufijaxozotejazilu.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_off000213e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x213E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00022bfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22BFD 11036 bytes
SHA-256: eae33b98da889b83d87a29902a350254f5a23878664f2cf7114182ac28dc615c
font_02_sfnt_off00024587.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x24587 18092 bytes
SHA-256: 01cbe4cfd2cfd20dbf7e7b0bdc47ecbaa5d04a2fd11ee2e7309bc676cd636e48

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