Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5756d7b9df37b07…

MALICIOUS

PDF

90.4 KB Created: 2021-09-01 02:19:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d9c516b90137a647e01460713fc18cc1 SHA-1: 053d0888a3dab2b69729a1fed8134cf3175ef8cb SHA-256: b5756d7b9df37b07df58c4b78b1c03f27e895f210640f53c4895b247ab2ebf59
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous URLs hosted on compromised WordPress sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The file's structure and numerous external links are consistent with a malicious document designed to lure users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/875abf0581b2890c288f6496d9788ebe/dopuwisowazavavejuzeku.pdf In PDF document text
    • https://travolution.travel/wp-content/plugins/super-forms/uploads/php/files/83b7e98e02a74afcc6949a5091a1f40a/puradakuzarased.pdfIn PDF document text
    • http://walkercombsfamilyreunion.com/clients/d/df/dfd517ab040340b2551da60fba195f5f/File/gibisafetiz.pdfIn PDF document text
    • http://1parareunion-club.com/clients/4/48/482fc251494624b09083a87f212a12d7/File/92707871547.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5f6197ad9---pafajegebuvam.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/hq2sr3os31lj1qggjcmfk19053/92354913488.pdfIn PDF document text
    • http://greece-ex.com/images/blog//file/23279033253.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/irlp7c2dals5vm5ncrb6p98oqb/niwogiwosonosilegizifog.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/7o83tln4u1prjnbgjefmo98r3n/rosafikus.pdfIn PDF document text
    • https://gerastar.com/userfiles/file/84963314686.pdfIn PDF document text
    • http://massimobertoarchitetto.com/userfiles/files/79827372784.pdfIn PDF document text
    • https://datatech-int.com/userfiles/file/sozimafenowegobinuwo.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16088b8be2f026---wasipajozirodabasutuvofa.pdfIn PDF document text
    • http://whitedwarf.ru/public/images/ckfinder/files/80531020843.pdfIn PDF document text
    • http://www.tsahimmongol.com/uploads/images/files/sutaselezakexobekifije.pdfIn PDF document text
    • http://shlawllc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/26517259318.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/160781ad518bc9---zuvuzewaduralomofirak.pdfIn PDF document text
    • http://tomaszfilipczak.pl/userfiles/file/18351058728.pdfIn PDF document text
    • http://commsoft.nu/demo/ktb/wsmbilder/files/laxasobelikofuwid.pdfIn PDF document text
    • http://dentalclinicbangalore.com/uploads/modigupanatobizetovenofev.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/3fddc64312c32dfb725b8b4a4eaccadd/rejoxurofirubozipu.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2d93a983f---jikipamupewufopo.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074c687edf81---90417615163.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=standard+long+haired+dachshund+puppiesPDF 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_off0000f7e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010ffe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FFE 10968 bytes
SHA-256: f1b568714b34c9f5d2439b10818fba0541bc9ac0918baf68587e79808e907958
font_02_sfnt_off00012913.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12913 19396 bytes
SHA-256: c6b53f3acc8c52fc15a976baf6551824ee6c8ceb330297e606e1586215f87b07

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