Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8cbae4f82fdd970…

MALICIOUS

PDF

73.5 KB Created: 2021-09-21 04:16:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3038770efdb09d7205d41f380c8cef60 SHA-1: 3f7d7f28ed49270c957fee12d29cbb4240d7edf1 SHA-256: e8cbae4f82fdd9704fefadea7acc7d037f57bc048ab7bcbe3fe4eedc2e9b7189
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, forming a link farm. The primary purpose appears to be directing users to malicious sites, likely for phishing or malware distribution, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://crysiq.ru/uplcv?utm_term=hello+app+mod+apk+download PDF link annotation
    • http://infinity8talents.com/userfiles/file/jenadejaxitipovojatilaw.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/0ad212160050446b036af3213a15c620/pedexibegumibuvalinudinut.pdfIn PDF document text
    • http://kristiankutschera.de/userfiles/file/59312413430.pdfIn PDF document text
    • http://tai-group.com/upload/files/tinetosubogaxijibatolo.pdfIn PDF document text
    • http://tandartsindex.nl/images/uploads/51066059000.pdfIn PDF document text
    • http://agilesolutions.in/uploads/fifonuxovodumimosivifon.pdfIn PDF document text
    • https://www.stnedu.com/ckfinder/upload/files/66181638781.pdfIn PDF document text
    • http://thongthien.vn/upload/files/50272061378.pdfIn PDF document text
    • https://sieuviet.net/webroot/img/files/2589827627.pdfIn PDF document text
    • http://fandimnarodaku.cz/upload/file/95428326637.pdfIn PDF document text
    • https://cristalparkhotel.com.ve/ckfinder/userfiles/files/52212265234.pdfIn PDF document text
    • http://xz-brand.com/ckfinder/userfiles/files/42060098089.pdfIn PDF document text
    • http://sdsenlex.com/upload/files/jiwijegile.pdfIn PDF document text
    • https://romalasergroup.com/userfiles/files/52292892487.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/42tpucphurjma3q2nbi6705r21/xeratotupuzub.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/gds903o943dq621v91oivr747o/63826034930.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/7e181f77fbcd961346f843085472247f/55366866586.pdfIn PDF document text
    • http://uniquecharacters.com/upload/files/vaworivirodum.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/3caab683fafd5481ebbd0af677a0249f/20847838969.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/semeke.pdfIn PDF document text
    • https://gemicilojistik.com/userfiles/upload/file/bosefom.pdfIn PDF document text
    • http://dralituncer.com/userfiles/file/91943589782.pdfIn PDF document text
    • http://tinavaron.com/ckfinder/userfiles/files/70748029206.pdfIn PDF document text
    • http://hcbarrett.com/user_area/file/67575202490.pdfIn PDF document text
    • 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_off0000bd85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD85 17240 bytes
SHA-256: 521c3a4910d83f88a70b0bc115fef1ec2172b32fe1d7222aa4636967068cec7f
font_01_sfnt_off0000e998.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE998 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000101af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101AF 10264 bytes
SHA-256: 2de4a3bc30b0e82bfc42d994516fc8764db292d945f55e3efe2cb7caf82288d3

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