Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7db914386613358…

MALICIOUS

PDF

83.6 KB Created: 2021-07-19 01:05:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 6163f3f262508ff8ba595996d87e4e8e SHA-1: 16c4a737eb55eece0d07b29574343a53c5d5fc0c SHA-256: e7db9143866133588f6131c3509519243a89ea271f8da386f774d1402b681745
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and link farm heuristic are sufficient to infer a malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/6209beacebdd3d0cb6ff25491633e812/gerijisadipovug.pdf In PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/28bf434e717ae6bef8e768710fbb31e8/rosopikowujuxenuwogileno.pdfIn PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/7c8f7a6a83820a3765fb9239fc52cb22/dijevofixuwopatovoporagab.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607c9f6957ddf---88579432708.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/7spmosre7ks7dukumpuu1nb2u5/zinul.pdfIn PDF document text
    • http://feach.ie/images/uploads/file/kazesozubelotew.pdfIn PDF document text
    • http://turagent007.ru/userfiles/file/54832625781.pdfIn PDF document text
    • https://victorybear-info.com/userfiles/files/16140224333.pdfIn PDF document text
    • https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/3fe5ddfb97dc3d84a0e5b1296027483a/16774524893.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cf613eebdf---nikovagepas.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/bdai5steh7nhqsghi64l1956q8/36774831851.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/3516d058018c7045e57dd51ca59ac2e5/60301575835.pdfIn PDF document text
    • http://ahchala.com/img/file/39791829265.pdfIn PDF document text
    • http://dh-life.com/ckfinder/userfiles/files/visemobovuro.pdfIn PDF document text
    • http://vtvxm.vn/userfiles/file/mupezudodefakuvu.pdfIn PDF document text
    • http://trendybiz.in/usersfiles/file/41135753534.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/cci2u9fshcf3h72ps9gfkrbp64/40409370849.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607978ce85620---moxoxekin.pdfIn PDF document text
    • https://bestrecycledautoparts.net/images_i/file/rudopusizigufuvizetobi.pdfIn PDF document text
    • http://alacarte-design.de/userfiles/file/terenoxudape.pdfIn PDF document text
    • http://dorp.pl/userfiles/files/62604125390.pdfIn PDF document text
    • https://alasclub.gr/neuro/ckfinder/userfiles/files/1538575098.pdfIn PDF document text
    • http://stpatricksreunion.com/clients/84553/File/beguji.pdfIn PDF document text
    • http://kopdesign.nl/userfiles/file/91182319451.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=in+most+exergonic+reactions+the+reactantsPDF 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_off0000e5b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5B8 10684 bytes
SHA-256: 42e9fca4a7c78bf6684f75c14bea81e56080d60653546269a91a6678b0ae861b
font_01_sfnt_off0000fe13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE13 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011625.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11625 16464 bytes
SHA-256: cbe3ac909796a3f49a2f44d6fba5a49e7bc69fd254955b772af88edd7262b0be