Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fdaa5dbd6e21d87…

MALICIOUS

PDF

100.2 KB Created: 2021-06-26 14:58:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: e3ec8763f01fc36dcd778aeacd3f50bc SHA-1: a8bc0afdc8544c25237c1894ec974a7c3d78c5d2 SHA-256: 7fdaa5dbd6e21d87ce1f41bab11443335ed1d2450fc58e252224484bf24b7168
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous external URIs and link farms pointing to compromised WordPress uploads and other disposable hosting, suggesting an attempt to redirect users to malicious sites. The PDF structure itself is heavily obfuscated, and no readable document body was extracted, but the presence of multiple links to potentially malicious content indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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://drafthe.ru/uplcv?utm_term=sea+water+is+salty+because PDF link annotation
    • https://www.llgnjinc.com/wp-content/plugins/super-forms/uploads/php/files/f7e4846df43ece9b894bde5ae14545d3/82766105874.pdfIn PDF document text
    • http://opakowania-loga.pl/zdjecia/fotki/file/xexotawufobokoxunenij.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e22f650869---fekolawidobijokezu.pdfIn PDF document text
    • http://liyangah.com/Upload/file/57462517157.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609769fa5817b---futuzivezasosixejeje.pdfIn PDF document text
    • https://stallion-international.com/userfiles/file/garinosajimevovaxejijoson.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160987a02bd857---nufizepipeva.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/3c645aeec9cd36bc7d613319dee4ec52/16288189627.pdfIn PDF document text
    • http://udemadriatic.com/userfiles/files/63676292295.pdfIn PDF document text
    • http://khanaphatgroup.com/UserFiles/file/93092462717.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3acd336f49---56175195572.pdfIn PDF document text
    • http://nyett.hk/uploads/news/files/88972745955.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160756eee4fcca---81415135644.pdfIn PDF document text
    • http://zap-interactive.com/uploads/files/43766545034.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609c05b6de72d---46779948323.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/ms13quf1sav3v9up4t2uqgo9m6/rirujagusekobusetidu.pdfIn PDF document text
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/i5klfhbq6rkiin9s2du0kc1re2/sunididojapotaf.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a20cedc8cf5---51553804790.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16096f960eff8d---gedudemu.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/bc3hobfmjou6jcgt11tsbnkms7/19402140716.pdfIn PDF document text
    • https://getadoc.in/ckfinder/userfiles/files/56819894041.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607de9b579944---38407296724.pdfIn PDF document text
    • http://avenue102.com/uploads/file/74716864808.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012285.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12285 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013a97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A97 17960 bytes
SHA-256: e8a0277e58cb40c5b0176e8bc58eeab3ef3246c5436040a1d12605b0462982d8
font_02_sfnt_off00016a08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16A08 10512 bytes
SHA-256: 29ec28358fd4c77bc8b33baa5087a3cbffed12c3673033844a394a898d748b51

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