Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b5e56770b27b75b…

MALICIOUS

PDF

85.9 KB Created: 2021-09-12 12:48:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 519f53eb87950b22c1c3eb28ea980d72 SHA-1: 1d7813fa40d791f56653870f0161e01418d5045c SHA-256: 4b5e56770b27b75bcea429e4be3ee77cd89e9f2c51634b7a840d7e007fa6670d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with numerous URLs pointing to potentially compromised or disposable hosting. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to lure users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://seatraderhk.com/userfiles/pimokurepifadi.pdf In PDF document text
    • https://visualarchive.bg/files/norusuxerogagividemitu.pdfIn PDF document text
    • http://phukhoabacninh.com/images/files/34652583045.pdfIn PDF document text
    • http://styrexon.cz/userfiles/file/dupak.pdfIn PDF document text
    • https://ijp2.com/contents/files/17891003354.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/4dkvk5lfkulqbdeu7grdmso1rr/54749511210.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/wujepuda.pdfIn PDF document text
    • http://cortabellanews.com/userimages/96551025276.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/a38d6440d5933ae03aab09ed14a09804/41549041275.pdfIn PDF document text
    • http://webinaris.biz/ckfinder/userfiles/publics/files/77610681988.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/161343a897c9b0---vogorarapowolokubisija.pdfIn PDF document text
    • http://lishasurgical.in/ckeditor/ckfinder/userfiles/files/binulovadosaketozonag.pdfIn PDF document text
    • https://leosservices.com/userfiles/file/mizesu.pdfIn PDF document text
    • http://askort.pl/Upload/file/50441059988.pdfIn PDF document text
    • http://pro-group.ru/userfiles/file/98608163109.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///83755532192.pdfIn PDF document text
    • http://vatlieulamnha.com/media/ftp/file/20569703070.pdfIn PDF document text
    • http://stonepigments.com/userfiles/file/xonisekexitugizipitetox.pdfIn PDF document text
    • http://termocity.by/pics/files/50250194001.pdfIn PDF document text
    • http://irths.com/upload_files/files/dosim.pdfIn PDF document text
    • https://excellencetogether.com/img/files/file/jijidimekotexukil.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16138e8486a599---masowodupakunipanogera.pdfIn PDF document text
    • http://railwaysrailroads.com/upload_files/files/45181087001.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/tlgg16ar8df9p21m3ll1aej9fh/15085972757.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=the+kissing+booth+movie+download+in+tamilrockersPDF 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_off0000e76c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE76C 18764 bytes
SHA-256: db3d0a998ee432531b302edb87faa9f133f3503dc99ea76ee96ea12c2cb567a6
font_01_sfnt_off000117a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117A9 11164 bytes
SHA-256: 7e47140c0b7cc2d3f031ec3cf511e5d965af5b23f3418f87f88ba7ef45eb1513
font_02_sfnt_off00013174.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13174 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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