Malicious PDF — malware analysis report

Static analysis result for SHA-256 818c1ce472486cb7…

MALICIOUS

PDF

85.1 KB Created: 2021-09-06 15:05:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: e02b05db06f87287f7a66c2ead50bd2c SHA-1: 71443da43ef3f33bd77b9eda1cd5f5942a9710ec SHA-256: 818c1ce472486cb71b114fa6f8159e8a16ef8bd9a6d6e7937666220d2bf5e10f
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to various websites, including those hosted on compromised WordPress installations. The primary purpose appears to be directing users to potentially malicious content or phishing sites.

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 http://flirdining.com/uploads/files/14496268643.pdf In PDF document text
    • https://axlthailand.com/imagexx/files/molipatukesowez.pdfIn PDF document text
    • https://xn--hjrnskadeakademien-mtb.se/userfiles/file/2502699290.pdfIn PDF document text
    • http://dienlanhlongan.com/upload/files/98280347333.pdfIn PDF document text
    • http://dotacjedlaoze.pl/userfiles/file/mamuxelobarigiwojujaxipoz.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b61aeb0d21f---kalojuxubuvozen.pdfIn PDF document text
    • http://aucoindeshalles.fr/menu/file/wafiwuge.pdfIn PDF document text
    • https://98ing.com/upload/ck/files/20210825_033058.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/60269cc84f0ab09413e6cc17dbbb2968/56755387530.pdfIn PDF document text
    • http://dobrejaja.com/Upload/file/fukijimenigopavi.pdfIn PDF document text
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/16093d87f9279e---53521502563.pdfIn PDF document text
    • https://www.reflectionuk.com/wp-content/plugins/super-forms/uploads/php/files/qog24kousnhnn1r8beoovkpqcm/somogepowovudotakisokasad.pdfIn PDF document text
    • http://mixline.ru/img/lib/file/36744273482.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bf84a57ee4e---5601630846.pdfIn PDF document text
    • https://protradingindia.net/userfiles/file/gatepufisu.pdfIn PDF document text
    • http://ohsongpharm.com/ckfinder/userfiles/files/kimowazusujupewitumuna.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/a90fbb7121ed502eb7f132b82bf1896a/92404743263.pdfIn PDF document text
    • http://kino-cosmik.ru/sadm_files/ruxufuko.pdfIn PDF document text
    • http://virus-safe-zone.com/ckupload/files/jopixusozibabofoxikap.pdfIn PDF document text
    • http://xinghui.co/upload/ckimg/files/202108031232521273.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/f59b34d3f52dd2fea77b8700440a045d/xenikusokenezivebemefufo.pdfIn PDF document text
    • http://stonestudio.pl/files/upload/file/dowiziwo.pdfIn PDF document text
    • http://royalwedding.jp/images/blog//file/vegefivowokijok.pdfIn PDF document text
    • https://mlmrockstars.com/ckfinder/userfiles/files/2306795732.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=programa+para+juntar+pdf+gratuitoPDF 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_off0000e3c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3C9 19680 bytes
SHA-256: 50238f196467ceb82f93f21a75320ad7521ab633924be04068e020f420441ad6
font_01_sfnt_off00011653.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11653 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012e6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E6A 10728 bytes
SHA-256: 8df5833d7b9d29566b43d836a7a21f88bf9a970158e245c302202311b7165c6e