Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9e10e812eab4c2a…

MALICIOUS

PDF

81.7 KB Created: 2021-08-06 17:20:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 4006475cdf073fa60564424dd5942769 SHA-1: ab9fe007fc72d9f0d20640f9e7bf1e233fc90d51 SHA-256: d9e10e812eab4c2a0782b058f181433dcf33f88c4f7bb72d18917a649c099b24
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file identified as malicious by ClamAV and ML classifiers. It exhibits characteristics of a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to obscure the final destination. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate a phishing or redirection attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5260

Heuristics 5

  • 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
  • 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://hollywoodterrace.org/clients/863344/File/bijimazukesasodepudujazum.pdf In PDF document text
    • http://acecaalcoy.com/userfiles/file/44225722288.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16087c5e3a97a8---sowujevawogigipevijatuxe.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/5a201fcdad45dc0f48a75a66f4d0222b/49535220106.pdfIn PDF document text
    • https://accidentmatters.com/ckfinder/userfiles/files/3894304099.pdfIn PDF document text
    • http://ecovn.vn/uploads/news_file/xomisineraw.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607d49d8b4046---99082932864.pdfIn PDF document text
    • http://tecnoservizi.com/userfiles/files/litomovinuguperigiri.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/baa957c23c27c3fd8e455917f0a142d8/51944669648.pdfIn PDF document text
    • http://loca-granderoue-montaletang.com/ckfinder/userfiles/files/71937100938.pdfIn PDF document text
    • http://elektrostroy.kz/ckfinder/userfiles/files/jagojegunaragulif.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608566073f030---tubofanedebogidojug.pdfIn PDF document text
    • https://nbretail.com.vn/ckfinder/userfiles/files/52089576740.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/uh26c3tigofc8m0r4ljmcmt1q2/turowisomuxikirixeb.pdfIn PDF document text
    • http://raisemoneyonline.org/clients/6/69/691275cf9a36cab982b2498ebdc715be/File/zolujezogivekemanosijeji.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160896117b447e---68270807439.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f095f65128---jofejelemikowodetedif.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/277c144de3aa50d8c3576f26fa305bfb/wefijunedeluvup.pdfIn PDF document text
    • https://hunde-katzen.at/soubory/5271347131.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/eb2833ec15164a6adf0773ef71174b84/71186395837.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/aced18d0f4717af16d981c14b0f7f8fa/fidolazuditikesapurilosip.pdfIn PDF document text
    • https://www.tzounakos-insurance.gr/ckfinder/userfiles/files/20208857496.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160709cf97366e---ridolulawowejeb.pdfIn PDF document text
    • https://dveropolis.ru/upload_picture/88667945594.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160acebe24adf2---88445049343.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=create+apple+id+free+in+android+phonePDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001042a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1042A 10456 bytes
SHA-256: 0fe6262f4f464d40dfb7bf02929c46e7eb8405dae6635f66d0264560637a03db
font_01_sfnt_off00011bbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BBF 17640 bytes
SHA-256: 9d58b5d38e2bb90bbd76a476de54abc064d59027d0a7287980b5c5b751c96035