Malicious PDF — malware analysis report

Static analysis result for SHA-256 daf5f81263b5cb90…

MALICIOUS

PDF

86.5 KB Created: 2021-08-14 01:04:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 790b6e5d290b13777ddc025eaf94082e SHA-1: b70ff6c49414eca4ff342cbbb21b4260b5f033af SHA-256: daf5f81263b5cb900d6204fe395a88b362a0027219e872327d86a29603e1d895
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as a phishing trojan and by an ML classifier, indicating malicious intent. It contains numerous links to various domains, many of which are hosted on compromised CMS platforms or appear to be disposable link farms. The primary function seems to be directing users to potentially malicious external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://alibabaoman.com/basefile/alibabaomancom/files/jotokirunogegusolo.pdf In PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/srhkd6lqj0361r4ffpmsit07d3/xaxonupujuxopujekotef.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608076a78b7fe---17756361544.pdfIn PDF document text
    • http://www.masozilina.sk/ckfinder/userfiles/files/dogijizevefikaguwinozale.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/6b13d829385930f2194639c1da78c29e/wufaveja.pdfIn PDF document text
    • https://zabulgaria.org/userfiles/file/49326155760.pdfIn PDF document text
    • https://qualitymattressfactory.com/admin/userfiles/file/xojifekosulodidobopot.pdfIn PDF document text
    • http://k-souz.com/userfiles/file/68403145113.pdfIn PDF document text
    • https://obermeyer-modemarkt.de/upload/file/tolerigoporag.pdfIn PDF document text
    • http://tavio.su/files/file/99168455967.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/xowofinupakaxirukapox.pdfIn PDF document text
    • http://xn----8sbxab3abskk3a2j.xn--p1ai/media/file/25851298003.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606db9e40017e---bupomuniz.pdfIn PDF document text
    • http://tiendanatacion.com/noticias/files/24129606905.pdfIn PDF document text
    • https://tlpnw.com/wp-content/plugins/super-forms/uploads/php/files/1f585e2c3a1f8949f1cdab830f40f020/21125131381.pdfIn PDF document text
    • http://www.wiz-fac.com/uploadImg/file/duzisolemipulixodewatax.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/f10fdf83900b609b27efd21c1fb4613a/22652640565.pdfIn PDF document text
    • http://carrollcountylawyers.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/71019806518.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607cd8140bed8---32395669150.pdfIn PDF document text
    • https://www.indoorclub-informa.com/boletines/img/file/1032891197.pdfIn PDF document text
    • https://stmarys-perthamboy.com/upload/File/dudajaxapupin.pdfIn PDF document text
    • http://www.greenbriarpropmgmt.com/wp-content/plugins/super-forms/uploads/php/files/f3ee00ce4d0f988d870b28f27e309c5c/4042247526.pdfIn PDF document text
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/7c4ef7e800d5cdf3f1074349ded4314c/49524423656.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/513428c4754468e2e109396b52f7cfc5/belisomiwezawabojopulaz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=what+is+normal+nrbc+in+blood+testPDF 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_off0000efb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB4 10768 bytes
SHA-256: 4908fd36a21d6f2cb8607c6d472c81b95a3ac36d1774d74e696cd4d9423689f5
font_01_sfnt_off0001084d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1084D 17092 bytes
SHA-256: 5ff593c8a2cdb9bfc70277531f5fc1a3e2e24f41f3ca713a312555d20a5d0a7f
font_02_sfnt_off000134e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1