Malicious PDF — malware analysis report

Static analysis result for SHA-256 48815b0835fd6630…

MALICIOUS

PDF

90.0 KB Created: 2021-07-30 21:58:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5ef838670f67870d8b0bd9123742ee45 SHA-1: 43f8c8ad93919ae97105f2462ed93b17a4bcf14a SHA-256: 48815b0835fd66306bced460feb240c49d77fe3e70fe81f7b253296d06ae08f3
156 Risk Score

Malware Insights

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

The sample was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous links pointing to compromised websites, many of which host PDF files within WordPress plugin upload directories. This suggests the PDF acts as a lure to redirect users to potentially malicious content hosted on these compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/bbundjj6vlbd6k1fokfbm21ds3/sepijakowuvezasimu.pdf In PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/e03e8bf92064fe42ac91d09ffc626d9e/kobon.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/eb24759df98896726b281e434fb5fb32/65609542103.pdfIn PDF document text
    • https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/e4913b47ec73c55044e05e8d16bc9ac7/16181669699.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078337e1fcc2---46240589345.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160dac3c62530f---50446472202.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c170422376b---rireju.pdfIn PDF document text
    • http://distributoram.com/files/file/11137396623.pdfIn PDF document text
    • http://crescentcarpets.com/userfiles/file/46711444424.pdfIn PDF document text
    • https://kisikana.hr/userfiles/file/novise.pdfIn PDF document text
    • http://lapenya.cat/imgjovesnaves/file/fipojuzakedan.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/cnr4stmm4v8rguivh8grast8hp/lotugalife.pdfIn PDF document text
    • http://ronaldtan.nl/images/photo/rawodixituruwisunarof.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/sjg8uf98pigpr0e9k2dfmjq20e/69585926376.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/9oh12r4q4egkf9cvdhfkuokudj/44126303965.pdfIn PDF document text
    • https://deepex.hu/hirek/files/xogofusivi.pdfIn PDF document text
    • http://ngoinvest.com/uploads/ckfinder/files/49173977236.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/225eb0547192b36b868d958ef6b1b0af/ritisimudazatasova.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/8f781daba2180c6094215bb885a539c1/bonopa.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bd9a2c50869---22775517421.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/5ef206d95280682f09aadda10d457ec5/15987256200.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/valimada.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160811daa63b9e---rasakexaganekefetagujexev.pdfIn PDF document text
    • http://learnersdigest.org/userfiles/file/29779837602.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=strawberry+razzle+dazzle+crape+myrtlePDF 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_off0000f667.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF667 10668 bytes
SHA-256: 8060ce2051e623ac5419a68be2a09b660d0504f5e065afddf50f618b44d4c138
font_01_sfnt_off00010ecb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ECB 18388 bytes
SHA-256: c12d4b6f27a269631f0575fc503c95cf77052e0304ed9e20f13017ea6ff89a58
font_02_sfnt_off00013f38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F38 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1