Malicious PDF — malware analysis report

Static analysis result for SHA-256 94eaebc057d0fdf3…

MALICIOUS

PDF

88.5 KB Created: 2021-09-04 11:48:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 6cfe96abf444233b61850bd6f08d8447 SHA-1: ace91ab19e6e5cc0ef082f43bef5cd4d92762150 SHA-256: 94eaebc057d0fdf3485a15da89154b44f3ceb6792e06a7a7220c69524fd3ca73
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's used for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://skolicka.eu/foto/images/file/46364346038.pdf In PDF document text
    • http://gzafjc.com/uploadfile/files/guzufubunazefumimexoner.pdfIn PDF document text
    • http://ranjitabiswas.com/userfiles/files/fowetevugunizimel.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/f6bf2a347259059a1cd3d0ef39b62128/nenelutetegakog.pdfIn PDF document text
    • http://www.ecostroyservis.ru/File/lifasudenugarafukok.pdfIn PDF document text
    • http://ukrkarta.ua/fckeditor/userfiles/file/73996551252.pdfIn PDF document text
    • http://commsoft.nu/demo/ktb/wsmbilder/files/walizegu.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/577j7hfdgnkrc5ajuuetk76k05/35520192350.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf3518358c.pdfIn PDF document text
    • http://udmvdpo.ru/images/files/29888994004.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/fijemetitofurowidotibutif.pdfIn PDF document text
    • http://tamker.hu/userfiles/file/wadifukidamovufosonok.pdfIn PDF document text
    • http://ztkammer.at/uploads/file/47521708172.pdfIn PDF document text
    • http://zjhywt.com/images/upload/File/869573282.pdfIn PDF document text
    • https://ihappywash.com/uploads/files/202108231930301401.pdfIn PDF document text
    • http://airmon.hu/images/files/37919738443.pdfIn PDF document text
    • http://korytnica.net/data/files/79395026609.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a78a68bc1db---58349098742.pdfIn PDF document text
    • http://lulanjina.net/upload/files/47442154233.pdfIn PDF document text
    • http://larrysiegellaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/25855407820.pdfIn PDF document text
    • http://poornasreehomeoclinic.com/ckfinder/userfiles/files/kazaj.pdfIn PDF document text
    • https://www.engltg.com/wp-content/plugins/super-forms/uploads/php/files/3776b594092b031508744e56254cbb60/7568204729.pdfIn PDF document text
    • http://grafosaleservice.cz/images/fck_editor/file/xuvinoguwudogutod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=bedienungsanleitung+samsung+galaxy+s8+plus+pdfPDF 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_off0000ec9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC9C 11196 bytes
SHA-256: 1cba8a0db65cb3c283d6fb8619bd15133d4bba48f7d8e9ac5666318f91851496
font_01_sfnt_off000106a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011eb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EB9 20860 bytes
SHA-256: 5fbe122c4b867daddb93f4813437cc0bcc1dea749e9bf22834a7cdcb02f627d0

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