Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d190ba9211306df…

MALICIOUS

PDF

90.6 KB Created: 2021-07-31 08:00:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: cf9b8a2647c12f4291cf4361415ed4bd SHA-1: ea7529f6c8fe2692713dd354eb9d1ee42478f8f8 SHA-256: 1d190ba9211306dfc931fd7d0f80e12987eef4a673cb22aaab8cc121fcf42ef7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to various domains, many of which are hosted on potentially compromised CMS upload directories or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery through these external links. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://alnahamgroup.com/userfiles/file/44012334342.pdf In PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081bfadb1ec6---48709573447.pdfIn PDF document text
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/414d6a8ae7f2221993367ea289a90ba9/42136953212.pdfIn PDF document text
    • http://narcisse.sk/editor_uploads/files/1489120302.pdfIn PDF document text
    • http://mxagproducts.com/upload/browse/file/99833259093.pdfIn PDF document text
    • http://biblioteka-belzec.pl/upload/files/nonakubojemeni.pdfIn PDF document text
    • https://www.colours-of.com/wp-content/plugins/super-forms/uploads/php/files/pck852cnejam9t8uhcpqkh10hm/69784097614.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607a5e98ba0a4---49278038137.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/vatukisawezijijunudevirop.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/7e28672b100d82cac6452c30a1cd4e76/73945392637.pdfIn PDF document text
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/51aba5120612019ce8f0cfb348f17bb3/nigitemiw.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/c3d679cd703c5b00fc57a3419e3759c1/nozamopanodedilarife.pdfIn PDF document text
    • http://td-mg.ru/uploads/files/40955849253.pdfIn PDF document text
    • https://songhong-thudo.com/img/files/sipejumomabo.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/c890c54a0299f876641433703c57079a/derumevojikenenare.pdfIn PDF document text
    • https://www.foundationofhope.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607d062de4d61---tezaja.pdfIn PDF document text
    • http://rogersdesignhouse.com/uploads/files/4727495520.pdfIn PDF document text
    • http://lbtech.kr/upfile/files/fewapifegadevemuxo.pdfIn PDF document text
    • http://inspirationforexcellence.com/clients/66491/File/6364684766.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/k2l3e1ocn1178ehg8qmi0tdtlk/79912575261.pdfIn PDF document text
    • https://akita-inu.lv/www/files/files/fuwibusawokagitofivato.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=what+are+the+three+main+points+of+cell+theoryPDF link annotation
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/98a6868fc61d226dd696b891bb520b95/17145434856.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_off0000ff81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF81 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011798.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11798 10852 bytes
SHA-256: e8739619bc014ead4c8c3037f3c2650f0c19fbebea5dae4d1609d5ac9ca44992
font_02_sfnt_off00013087.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13087 17324 bytes
SHA-256: f18a48e65bb72a55e51692407ef4a0cee32d8c244ff225a291024ac9a5a9287a

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