Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae0f14c57edd13ea…

MALICIOUS

PDF

88.1 KB Created: 2021-06-27 23:48:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 80a8f1458be8311d7109da15553043cb SHA-1: 2754c5739867ee0de5c2edd1a4afd5f6156e5af9 SHA-256: ae0f14c57edd13eaa638d9042b4ef835cd86ad9e765a363b3691126b027b5f46
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to obscure the final malicious destination. The ClamAV detection and ML classifier further support its malicious nature, likely serving as a phishing lure or a downloader for a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://onishi-kyosendo.jp/archive/25949886479.pdf In PDF document text
    • http://mamnonlittlesun.com/upload/files/70071112873.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606e8e7bbb77b---xitabejibamenijepa.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2260f33987---kezurewud.pdfIn PDF document text
    • http://arserwood.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/210622002459917863kergb1.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d5c34b7679---junutonugilezab.pdfIn PDF document text
    • http://ayhancevik.com/images_upload/files/wigefixawobu.pdfIn PDF document text
    • http://austria-ex.com/images/blog//file/24983433194.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c98875e8ecb---95617308417.pdfIn PDF document text
    • http://serextion2006.com/js/upload/files/27173092335.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608479424f395---62041869960.pdfIn PDF document text
    • https://cgeminfos.ma/upload/file/54334285980.pdfIn PDF document text
    • http://ledseoul.com/userData/board/file/75472051477.pdfIn PDF document text
    • http://divorcefinance.nl/uploads//file/33497923661.pdfIn PDF document text
    • http://takemehometomatoes.com/ckfinder/userfiles/files/36116071801.pdfIn PDF document text
    • https://www.reflectionuk.com/wp-content/plugins/super-forms/uploads/php/files/o2pr0nu1p28ipvvl52jd8t7hes/libopipudaxifexe.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c49cf77a95---zobos.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16072cd67d3c7d---70268652234.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/21ff60fbede6c4674b9a35473899d236/majaxor.pdfIn PDF document text
    • http://dynamic1984.com/user_file/file/kazisezobifazesezi.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/g8p1nki50pmphup3ba2nsi6j6n/45448937785.pdfIn PDF document text
    • http://www.radiooro.com.mx/media/images/uploads/files/kexop.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/cc193aad68428cb2f0fbedcc431e15e4/bizikabipulewopaxadum.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/ll2a6kag88b7882u6u3hhf2030/fosexurinupozubimiw.pdfIn PDF document text
    • http://99hospitalitygroup.com/ckfinder/userfiles/files/lesironewajesamuk.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/7b9104577198f267b309ab4ebe2ac1f0/28679981844.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=the+story+garden+5+pdf+downloadPDF 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_off0000f263.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF263 18136 bytes
SHA-256: a08f0772fc51231c0715dd4670dd8ac0fc3e2148f74988f9cba5078131386ca2
font_01_sfnt_off00012156.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12156 10980 bytes
SHA-256: c3ffb3308e6a7b2c4f2647ca4bc98d43aa0e72da1790832dd8d983d856765311
font_02_sfnt_off00013ac6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AC6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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