Malicious PDF — malware analysis report

Static analysis result for SHA-256 18cad6e3b58569b9…

MALICIOUS

PDF

100.2 KB Created: 2021-07-17 20:11:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: daea2eac82a13b331efd2a453b5f3183 SHA-1: 1b7d40b36ceb00c97749cac1247ce80c0f4ce437 SHA-256: 18cad6e3b58569b96db77d7e574fdffef71781ec4cfba29a96dc94b9c03e3d4f
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains a link farm with numerous URLs, several of which point to PDFs hosted on compromised WordPress sites, indicating a potential phishing or malware distribution scheme. The presence of multiple distinct hosts and the use of disposable hosting further support a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/f336b1d3ee4c6f9e4809270fdfc3892e/63299497665.pdf In PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/u4t3sp3uai3gfb3sjlgdb5k7o5/bamavazirodidofoxuzevupob.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/29ca3bf8b23c09b0c7c7bb1a3fcba589/27115168986.pdfIn PDF document text
    • http://zulaikhatextile.com/userfiles/files/2817739341.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c291986d8ee---didagurog.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/8ba6675a0799377e31927f8334c49633/87869939303.pdfIn PDF document text
    • http://ksnjl.com/userfiles/files/nofegod.pdfIn PDF document text
    • http://allaboutdowney.com/userimages/12873474329.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160730de7232c6---14900981988.pdfIn PDF document text
    • http://playeasypiano.com/resources/fck_images/54299703493.pdfIn PDF document text
    • https://betenenergy.com/sites/default/files/file/69273450994.pdfIn PDF document text
    • https://menlopark.com/wysiwygfiles/file/widofinawebodebasu.pdfIn PDF document text
    • https://hotnews.md/upload/userfiles/files/16736331504.pdfIn PDF document text
    • https://ntwbearing.com/UserFiles/File/59885704853.pdfIn PDF document text
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/d111c975dc8b002a53d52cce307d87c5/wejikofax.pdfIn PDF document text
    • http://tasteofruraleurope.eu/upload/File/kajokajiborenefowone.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/e3fcfc0ec3e54f2a54664e97427424f5/dumegivosukurususefo.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/4omb8sibdeked6rffmkt3l8180/34529007598.pdfIn PDF document text
    • http://rebornfair.com/FileData/ckfinder/files/20210614_0C076E536CCE0BDA.pdfIn PDF document text
    • http://ahlhy.com/uploads/file/12222457553.pdfIn PDF document text
    • http://staropolski.net/Upload/file/jomakuselizisizulapu.pdfIn PDF document text
    • http://czechdidgeridoo.com/admin/upload/file/31736990750.pdfIn PDF document text
    • http://benedictinoselrosal.org/ckfinder/userfiles/files/67745944721.pdfIn PDF document text
    • https://cabsfromheathrow.com/userfiles/file/teboralisa.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/ea8302333d7f5af8fdde7d63f927e36d/nugezefure.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=chicago+manual+of+style+punctuationPDF 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_off00012003.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12003 18004 bytes
SHA-256: 3d575155b8f51c3475b082d503864e09351036cb9616be71642f7dd46494792b
font_01_sfnt_off00014fb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FB2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000167c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x167C9 11072 bytes
SHA-256: e79da778becb0e361a52d37150e78b2e60031dab4b98f6203537206e79e4f8ce