Malicious PDF — malware analysis report

Static analysis result for SHA-256 39361870d6728c3e…

MALICIOUS

PDF

87.4 KB Created: 2021-09-05 08:47:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1879643e3cc1ea84c050d474b256efbb SHA-1: b4892a99f9c5c95df21add09e048d071c7e8ad07 SHA-256: 39361870d6728c3e8597413369aeeef899d6869f768ea88f2bc40de2b6d5aa2f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm or redirection mechanism. The presence of external URIs and the overall structure indicate an attempt to direct users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://chcial.ru/uplcv?utm_term=oracle+sql+commands+cheat+sheet+pdf PDF link annotation
    • http://www.trisad.kz/ckfinder/userfiles/files/1352716872.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1606e400ae1419---34270474715.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b269ee46a4---64188860748.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a62b0477b7e---tademakiwe.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16125140430641---89812089541.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/98662623127.pdfIn PDF document text
    • https://legacydockandmarine.com/wp-content/plugins/super-forms/uploads/php/files/30e2a6c337d6e8d726b2e3b1a3806973/44214580573.pdfIn PDF document text
    • http://finproekt-msk.ru/userfiles/file/dibul.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/cbc6e48528ef0cad102ba30bf16669ba/33967030094.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085041b93037---rusajamubefelurubovorafi.pdfIn PDF document text
    • http://aviatechinform.ru/sadm_files/belativupunagiweratinonev.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/m0dt5db7nu37ck5v37gqlaj02p/likazividuvobazi.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16084a548806be---garatit.pdfIn PDF document text
    • http://tpokebar.com/uploads/files/vetopewen.pdfIn PDF document text
    • https://aprilboya.com/userfiles/file/dilofod.pdfIn PDF document text
    • http://didopack.com/files/vunetugeregawujufamonevus.pdfIn PDF document text
    • http://project-lovcen.me/userfiles/file/xevegukegufa.pdfIn PDF document text
    • http://gruppocinofilomarsalese.com/userfiles/files/11145083278.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609ea0853c98d---74782131865.pdfIn PDF document text
    • https://www.abandassociates.com/ckfinder/userfiles/files/81530126788.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079ade7a9677---89759608381.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9b6167d85---87715887266.pdfIn PDF document text
    • https://ferado.vn/userfiles/file/11646315327.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_off0000f03d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF03D 17620 bytes
SHA-256: 1d767a0e3a25501e6ff8079eb72b18f771322c3efee229c0e473e6e31ae9f906
font_01_sfnt_off00011eb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EB5 10964 bytes
SHA-256: b8ecd392cc9f826964ba244156068301415794cc059b8844a49efd6f1d711bfc
font_02_sfnt_off000137c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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