Malicious PDF — malware analysis report

Static analysis result for SHA-256 b816b37db08c7afa…

MALICIOUS

PDF

72.5 KB Created: 2021-08-28 02:30:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 0cace0203500d989a6f0e3ae6089f3c2 SHA-1: cd5a124667f502ba0a0d9cac01b143b5bfb31d90 SHA-256: b816b37db08c7afaa63e8e9505e877f46a5729cfc477be04d0f28c46a10a37fe
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external resources, many hosted on compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The 'SE_INVOICE_LURE' heuristic indicates the document's content is likely a fake invoice or payment request, a common social engineering tactic. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to deliver a secondary payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

Heuristics 7

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/851b90c015c8908c17b13be15cc578b9/kesibulupamafeb.pdf In PDF document text
    • http://kortennis.co.kr/B/ck/ckfinder/userfiles/files/82903706251.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/2aatpdo8f07qmm3n32torhcuci/28379350731.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/28940a064f703af31b1e454726479d04/nabuv.pdfIn PDF document text
    • http://candleelectricals.com/uploaded_files/userfiles/files/lidutupabodemuluva.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/98c2d685f5475c9f5e7a2b898565ec76/riwanelojenizun.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160fc5f4b2d3cc---23626065919.pdfIn PDF document text
    • http://diysmart.net/userfiles/file/26274835750.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160727846aaf14---34378528186.pdfIn PDF document text
    • https://www.sudoku-cool.com/ckfinder/userfiles/files/demupumu.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/ltrjl73997hc8ok7o5mlurh4u9/zikupewu.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608484ca38e6d---75914908432.pdfIn PDF document text
    • http://debseven.net/UserFiles/File/63073900021.pdfIn PDF document text
    • http://elmbbq.com/uploads/files/xiramopivadoj.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b7952b1ea02---60707352856.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db0039bdd27---sizifidegapine.pdfIn PDF document text
    • https://usdcp.jp/user_data/userfiles/files/jidavo.pdfIn PDF document text
    • http://bsa-billiard.by/images_from_html_editor/file/75677899506.pdfIn PDF document text
    • http://pritchardreunion.com/clients/81409/File/dijopokefawoj.pdfIn PDF document text
    • http://apexibd.com/uploads/fck_uploads/file/donovixisoluvogibetuwi.pdfIn PDF document text
    • http://julianina.dk/upload/file/32762936395.pdfIn PDF document text
    • https://www.alapan.org/fckimages/file/jipezenupefalele.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/gui27uv7ef923qn2s6sgdbj2as/mixef.pdfIn PDF document text
    • http://abnicum.com/files/file/22929881681.pdfIn PDF document text
    • http://jvcc.cn/ckfinder/userfiles/files/210727001854690867f11ew.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/rladjcumflf8tu6icgukp7n3f8/62905922605.pdfIn PDF document text
    • https://marikakozmetika.hu/editor_up/26610259024.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=ts+eamcet+payment+reference+idPDF 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_off0000bb5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB5D 15564 bytes
SHA-256: 2e4c38f14ad9a9c556d5e78a341ee4ecaa7a57a503f296fe6e68e4c907ec854c
font_01_sfnt_off0000e343.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE343 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fb5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB5A 10692 bytes
SHA-256: 51d2fb19ebe66f314bc34c2328103ecdd9b35537b97cb198a4423ff1c3c131fe