Malicious PDF — malware analysis report

Static analysis result for SHA-256 c49d57fe53553a08…

MALICIOUS

PDF

94.6 KB Created: 2021-08-10 18:42:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 86da7ad241d0ac121b92753e0ce538af SHA-1: 218f267a006bde2216a56ddf3132b5529725f76b SHA-256: c49d57fe53553a08d4a463e4af83d04ddc146898e8f7061997b84716b4aec787
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as 'Pdf.Phishing.Trojan' and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm pointing to multiple compromised WordPress upload directories, suggesting an attempt to host malicious content or phishing pages. The presence of numerous unknown URLs further supports this malicious intent.

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 http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606c6941d0ecb---61753824114.pdf In PDF document text
    • http://capri.lt/userfiles/files/tawujeni.pdfIn PDF document text
    • http://xn--h1aaebajlcgx.xn--p1ai/sadm_files/mupifenerelo.pdfIn PDF document text
    • http://dentish.ru/ckfinder/userfiles/files/93314679605.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609415be2ce2b---81424360156.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160755a2b6faf7---1314531378.pdfIn PDF document text
    • https://cornerstonelaw.eu/userfiles//file/nodumaxutijotirivu.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/2c5eea15e13e7a8efab138312451ed4a/tudesexodinivate.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607132804228f---58000808443.pdfIn PDF document text
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/58aca154eec93c74ea75d92c6889d7fb/90800875905.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/9377cba2afc3620d59734dd238020585/29298854057.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086811c6d0cb---lutokizigat.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608bce60b7668---35816401598.pdfIn PDF document text
    • http://hhs63.org/clients/8/88/88ec95b665b56da82b1de85f097fba10/File/96994849126.pdfIn PDF document text
    • http://daindnc.com/fckeditor/userfiles/file/lonarukugimokozaraz.pdfIn PDF document text
    • http://e-kva.ru/admin/ckfinder/userfiles/files/86323981285.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/163gs3rdo9kn4qbtgvetrmflpe/wakubijuwuwozutagak.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/0bf3dc808b86e9d5ea0bfe7e32bb1d0c/76686076679.pdfIn PDF document text
    • http://xn----7sbakn3aoflleitf3m6a.xn--p1ai/userfiles/file/sadububavowebiposone.pdfIn PDF document text
    • http://maxgear.cz/webpagebuilder/ckfinder/userfiles/files/19376512189.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/62245529702.pdfIn PDF document text
    • http://yoron.net/up/files/zajik.pdfIn PDF document text
    • https://acgroupenterprise.com/userfiles/file/32640078280.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/739c96533b41b4bb2b7e3e4907d6bd75/suruwomirus.pdfIn PDF document text
    • http://altus.pl/userfiles/file/fokosinawimarox.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/c7b45d7953d267200c9499f728ebc1d2/fenedugop.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=what+penny+stocks+are+on+robinhoodPDF 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_off00010d4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D4F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012561.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12561 17504 bytes
SHA-256: 9a72e4278b8a15978250e9c12dba8d1fd7ee8c2e5fdedfe8c4e49363279e8f2d
font_02_sfnt_off00015314.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15314 10904 bytes
SHA-256: 543fd3277afd1ae8f296d20bdab1385b3f61a5285d43e2a50e100213ff1a4e9c