Malicious PDF — malware analysis report

Static analysis result for SHA-256 b94fc97b5c68894f…

MALICIOUS

PDF

76.6 KB Created: 2021-09-18 08:47:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 15506d57067ed8ffe4f52496e3704cb4 SHA-1: 0f087b3295d5dc86cc00afac71a7e7f860909f53 SHA-256: b94fc97b5c68894f9ab93d9c215ce6683ec34e36b5de1a79d83a5357cc758e00
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Static analysis revealed it functions as a link farm, with numerous embedded URLs pointing to various domains, including compromised CMS uploads and disposable hosting. The primary purpose appears to be directing users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://ingfrimale.com/userfiles/files/ponuxirafebijufoxina.pdf In PDF document text
    • https://www.natursany.com/ckfinder/userfiles/files/larejijut.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613e56e852591---95303797887.pdfIn PDF document text
    • https://agronlogistics.com/userfiles/files/37528236042.pdfIn PDF document text
    • https://www.leasing.net.in/ckfinder/userfiles/files/4062208007.pdfIn PDF document text
    • http://bdsductri.com/upload/files/geluvu.pdfIn PDF document text
    • http://ghibms.com/userfiles/files/megamademoza.pdfIn PDF document text
    • https://xosobacninh.vn/webroot/img/files/95346255242.pdfIn PDF document text
    • https://psg66.ru/admin/ckfinder/userfiles/files/4378242877.pdfIn PDF document text
    • http://client.diffuse.info/files/zusipi.pdfIn PDF document text
    • https://otomatcilarmetal.com/otomat/upload/files/balotufujaxeregejosu.pdfIn PDF document text
    • http://americandeliorder.com/uploads/files/juzomuludi.pdfIn PDF document text
    • https://www.seblocation.com/ckfinder/userfiles/files/43578212370.pdfIn PDF document text
    • https://riolospettacoli.it/filesUploads/file/21022491549.pdfIn PDF document text
    • https://giaynangchieucao.com/userfiles/file/79026633783.pdfIn PDF document text
    • http://cyc.cz/pictures/clanky/files/77386101065.pdfIn PDF document text
    • http://traktor-tv.de/sites/default/files/file/37533724848.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1613078466cd26---5091796373.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/0d09399ffa0b57349455842e16aee703/pemalosajebuso.pdfIn PDF document text
    • http://robfredo.com/userfiles/file/wefolovugexugafowurobe.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614164069d036---69383543254.pdfIn PDF document text
    • http://www.sushmitamukherjee.com/fckimages/file/valanexusovomolojakokot.pdfIn PDF document text
    • http://itnetworkconsultingsf.com/helpdesk/app/webroot/img/userfiles/files/pesakakonamekepuxufixibez.pdfIn PDF document text
    • http://duplisite.com/userfiles/file/balovemus.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=nid+maker+apkPDF 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_off0000c1a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1A0 20088 bytes
SHA-256: 5a2855e0b037285437e8d9b8bcd4df32034f0dcb9b5255f23d49dd7740dcb8e9
font_01_sfnt_off0000f675.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF675 10084 bytes
SHA-256: a9b4166c9c43767ce71937050e296f37c93b651c3121406e81e867c67798b3e5
font_02_sfnt_off00010cda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CDA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1