Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdb297cdba16956e…

MALICIOUS

PDF

85.6 KB Created: 2021-09-01 05:03:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5a646c3585381481c8bdfaff61e31098 SHA-1: 8d89e412e362a38b7a727fa2b284c790802349fa SHA-256: cdb297cdba16956e1c92aea60e6b7264d5b52bee7905de95e48395bd8b165b88
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous links, many pointing to compromised WordPress upload directories, suggesting a link farm designed to redirect users. The presence of these links and the overall detection indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610500fd310a3---jotokotefatowilarikopaju.pdf In PDF document text
    • http://sintellect.ru/Repository/file/81939666914.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bb12f2ddf52---kujaludis.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa52497ef37---19501349331.pdfIn PDF document text
    • https://deycaterers.com/ckfinder/userfiles/files/toxup.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/000eaece66eee9e548d49f77211c09a4/zikeroweke.pdfIn PDF document text
    • https://mimpishio2.net/contents//files/xaperejubab.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/xojides.pdfIn PDF document text
    • http://ledins.lv/cms/file/52374110613.pdfIn PDF document text
    • http://rickgrisolia.com/userfiles/files/dovezoga.pdfIn PDF document text
    • http://champagne-marc-chauvet.com/images/files/tujunetavosibibogek.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/70b23a95ac0fea11e5d7cb931e304153/6929906061.pdfIn PDF document text
    • https://leosservices.com/userfiles/file/niwepola.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cec2a81a12---migomuxokar.pdfIn PDF document text
    • http://pdww.ru/ckfinder/userfiles/files/31402620327.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607587edcddeb---24282790811.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083b93e9197e---81531840072.pdfIn PDF document text
    • http://harlit.com/ckfinder/userfiles/files/20210630_052445.pdfIn PDF document text
    • http://bora.su/ckfinder/userfiles/files/rejabazelabaravutono.pdfIn PDF document text
    • http://atrsara.ir/resource/files/23970854901.pdfIn PDF document text
    • http://yuha.be/_files/file/77595951465.pdfIn PDF document text
    • http://annassteen.com/ckfinder/userfiles/files/berovugezami.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a610ddbf1c3---tiwolidozopagalelugote.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=personalized+bookkeeping+%26+tax+servicePDF 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_off0000ec87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC87 10760 bytes
SHA-256: 955ca6df0c8faceb2d7a9c27c7f3c99ee63a8f63faf2733d4abcba8089c0eedf
font_01_sfnt_off000104f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104F0 17404 bytes
SHA-256: 5357263dea00f36329806768cc187c914c9092f68b24aadffb04d90b1470a1e3
font_02_sfnt_off000131d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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