Malicious PDF — malware analysis report

Static analysis result for SHA-256 7dedd0160dd12dec…

MALICIOUS

PDF

71.4 KB Created: 2021-10-03 23:16:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: d6fb0c05ff6768327e57817aab93e929 SHA-1: e9c425b0fda53da75937aea3faaf65618c3af399 SHA-256: 7dedd0160dd12decec90a182b7a29366aa3743eede4e0f6718aef2b42b78bff4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' confirms the nature of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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://pixomot.ru/uplcv?utm_term=simply+red+sometimes+all+i+need PDF link annotation
    • https://yourownadviser.com/ckfinder/userfiles/files/zipatosowoxotigagaj.pdfIn PDF document text
    • http://spl-designs.com/ckfinder/userfiles/files/duxoku.pdfIn PDF document text
    • https://xn--b8qxb801j.tw/upload/files/52557141559.pdfIn PDF document text
    • http://hmondo.com/userData/board/file/jafutikebuzelamu.pdfIn PDF document text
    • https://menu2uplus.com/images/file/repizo.pdfIn PDF document text
    • http://hugslock.com/app/webroot/img/files/64259014491.pdfIn PDF document text
    • https://epgeptech.hu/ckfinder/userfiles/files/562831943.pdfIn PDF document text
    • http://security-m.jp/tool/images/file/pojoz.pdfIn PDF document text
    • http://hzdsbg.com/uploadfile/1631322203.pdfIn PDF document text
    • https://frutalmente.pt/site/upload/file/24786224047.pdfIn PDF document text
    • http://bscsaoner.in/ckfinder/userfiles/files/53384078559.pdfIn PDF document text
    • http://norilskgu.ru/userfiles/file/98821974713.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/24d632a022e98d4c9fda60986fc91053/29832888064.pdfIn PDF document text
    • http://xn--djr00fsyfv0o5qgy9u.com/filespath/files/20210913013138.pdfIn PDF document text
    • http://yuc-fac.com/uploadfiles/20210924182814.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/16150fc262981a---48846739790.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614df7ebeea81---92358812502.pdfIn PDF document text
    • http://boatmonies.com/uploads/files/bikimokekowanufofenugi.pdfIn PDF document text
    • http://agenziaimmobiliarecannavo.eu/userfiles/files/40835336260.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/bomepof.pdfIn PDF document text
    • http://dream-mebel.com/pic/file/lovanin.pdfIn PDF document text
    • http://noahmission.org/dataroom/file/24288574060.pdfIn PDF document text
    • http://ytlcases.com/userfiles/file/tibugalabazoxoninadulif.pdfIn PDF document text
    • https://dbmotorbrokers.com/userfiles/file/5715546502.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ffcc340073---18604417652.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614969d080740---51285602872.pdfIn PDF document text
    • http://autoachtercamper.nl/userfiles/file/97412983717.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_off0000b601.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB601 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ce18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE18 10744 bytes
SHA-256: f8a77902b068f4e0011e343a59af232ba4193c4c88fd8256c7af015161b26426
font_02_sfnt_off0000e6c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6C1 15444 bytes
SHA-256: a4f6abd7a61b4d7d9ae2dc0d0aeb4e25c18f42d37dfd296f11819cb36891efe5

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