Malicious PDF — malware analysis report

Static analysis result for SHA-256 85e285dd5784736a…

MALICIOUS

PDF

85.9 KB Created: 2021-09-04 14:23:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 92ad13c5499a926d8d5dea6f13b9cd4e SHA-1: 5ef4a2aa4756d02d197cb23e3d15767e477de53d SHA-256: 85e285dd5784736a1d9fca8a5d0dd9e8df133894d282fd3e87dfd11c46d3b27e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to lead users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the embedded URLs and the heuristic firings point towards a malicious document, potentially leveraging JavaScript for exploitation if any were present but not carved.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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 http://www.gieskestukadoors.nl/ckfinder/files/files/55846977101.pdf In PDF document text
    • http://ljjxmining.com/uploadfile/file///2021083004554833.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/7e77b8873a36735474dfe58f6e6fa6cc/48357997284.pdfIn PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/bce30e1c8e0aa9c0e52dfdcc7a7d4b82/joburum.pdfIn PDF document text
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/2661a060cf1776317aabafff365875d4/munalezomafa.pdfIn PDF document text
    • http://kezmosas.hu/files/file/nunabaxivivilulinisuro.pdfIn PDF document text
    • https://readandenjoy.ae/userfiles/files/xikipewema.pdfIn PDF document text
    • https://efficimm.fr/userfiles/files/11589832272.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094793eb017b---45128661904.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/57cc63cbba17ce29e12214f69cf108ce/88156298891.pdfIn PDF document text
    • https://ikima.fr/uploads/file/lajeruraxolamexeketow.pdfIn PDF document text
    • http://jimsclub.net/new/board/img_tinfo/file/20210813041421.pdfIn PDF document text
    • http://stylowa-pss.pl/userfiles/file/63683448334.pdfIn PDF document text
    • https://eliteplacementagency.com/uploads/files/vajedinunoxiguwofusaj.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080e4a4bf27a---90582737207.pdfIn PDF document text
    • http://neodentpetrosino.it/userfiles/files/57000059667.pdfIn PDF document text
    • http://yuha.be/_files/file/73430848003.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/bb1707837461be95fe9cb367da046f1a/61629489580.pdfIn PDF document text
    • https://nguyenvanhuongloc.vn/app/webroot/files/images/pages/files/48443374995.pdfIn PDF document text
    • https://299-45.com/CKEdit/upload/files/1363139984.pdfIn PDF document text
    • http://rocincorporated.com/domain.com/images/dynamic_pages/file/16225772114.pdfIn PDF document text
    • http://dentherapia.hu/files/file/55224801887.pdfIn PDF document text
    • https://85097781.com/upload/files/12723885951.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=material+store+management+%28pdf%29PDF 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_off0000e92c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE92C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001013e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1013E 18364 bytes
SHA-256: 726b813be0f22fdaef20ab4f333ade4f7d9bf483ce291280f4fe0f310ab8886d
font_02_sfnt_off000130b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130B8 10988 bytes
SHA-256: e9140a7bbb643ec1f76eeb04c6b7eeec243ec3cd5a33a78393c051ca24b63dd7

Open this report in the interactive analyzer, or submit your own file for analysis.