Malicious PDF — malware analysis report

Static analysis result for SHA-256 888e8a888dc09bc6…

MALICIOUS

PDF

74.2 KB Created: 2021-09-04 00:34:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1f9da8f4d06c83f2c2412131c3cedcb5 SHA-1: de5570b8ced18b5e590ca2973f1d9e97902672f7 SHA-256: 888e8a888dc09bc6bd5dc6d2e14e9be745ccf56f6f5a867dfc376b794c519461
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.012 Process Injection

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS upload storage, suggesting it's designed to host or redirect to malicious content. The presence of numerous unknown URLs further supports this, likely serving as lures or part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/9c3547c7afeb4e20794f4ed64ff89e96/22118401109.pdf In PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077b14589792---57308309015.pdfIn PDF document text
    • http://maurovalleferroarchitetto.eu/userfiles/files/risudewe.pdfIn PDF document text
    • https://protradingindia.net/userfiles/file/83937317031.pdfIn PDF document text
    • https://www.hemoroidklinigi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607036dbde42c---8883459323.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160b3de8029f43---mimojiju.pdfIn PDF document text
    • http://rheumatology.institute/upload/content/file/4698207233.pdfIn PDF document text
    • https://ntct-dz.com/ckfinder/userfiles/files/mobotobizapinu.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/e1740364f845e1c64d02c913a2230019/bozejak.pdfIn PDF document text
    • http://evo-models.com/uploads/userfiles/files/19725646383.pdfIn PDF document text
    • http://www.santabriganti.org/admin/ckfinder/userfiles/files/vefavejitibujero.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160aed75a9bb74---71474680489.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071bb124f3f3---94684483432.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a5f6702ead---sevemipajiti.pdfIn PDF document text
    • http://dailymaytrogiang.com/userfiles/files/2518246109.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0af8ddd118---57815129928.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607f8315bfdb6---wavakojiwijasotejefixojuz.pdfIn PDF document text
    • https://citronixdeflection.com/nbloom/fckuploads/file/23493754006.pdfIn PDF document text
    • http://shethof.ch/cgi-bin/dynamisch/file/38347364862.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ea2e8ab9dc---23920869438.pdfIn PDF document text
    • https://strechybenesov.cz/content/beruzapijuru.pdfIn PDF document text
    • https://khyatiinfotech.biz/ckfinder/userfiles/files/4215433525.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607f066bb327d---jugasonu.pdfIn PDF document text
    • https://nutricionintravenosa.com/wp-content/plugins/super-forms/uploads/php/files/38cf2035c11940dded89c4b83f73df50/39244061742.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=r+language+definition+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_off0000bbcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBCD 17592 bytes
SHA-256: 7e724eb5f0ec7b6a6e1967a9d0ae14a59388ed8dff853cc4bc7f9c3f5af2b855
font_01_sfnt_off0000e9fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010213.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10213 10548 bytes
SHA-256: bb4a8726c684828ff2863979c4251d94966c0138dfb2755bb55fd6db6c80fb32

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