Malicious PDF — malware analysis report

Static analysis result for SHA-256 4742ae1d4ae0ca7e…

MALICIOUS

PDF

83.4 KB Created: 2021-08-26 08:16:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: d0bfc140ad7b83f4a4058a11c854e6cd SHA-1: 583036096b1ce3e0fcf381888bde5b9c4814d544 SHA-256: 4742ae1d4ae0ca7e7aa06966cb4518ff704d523040b3582a464882c08b7652c0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, characteristic of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to lure users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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://gd-weimi.com/upfolder/e/files/20210616012922.pdf In PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/2643563b6024e490e3a944546dbd2815/janab.pdfIn PDF document text
    • https://thesaddlebank.com/wp-content/plugins/super-forms/uploads/php/files/ng3segc3te9pltpmadom8hvp7s/dopijariji.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079b0bc9cbd4---51178763177.pdfIn PDF document text
    • https://kueapem.com/contents//files/73435828375.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e6db627a7d---mobotopo.pdfIn PDF document text
    • https://acornschoolcharleston.org/wp-content/plugins/super-forms/uploads/php/files/5625ab2666df40c7178dd14dfa904aa9/dofijuxegejogixet.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076e947d8d90---bujokebabakekag.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/3go4eujf3ri5sjqa9dfj0k5di0/kanowesipevugipurefoze.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609b9b694a61d---15187155615.pdfIn PDF document text
    • http://handbook.hu/upload/page/file/jafuxafufavunazelipape.pdfIn PDF document text
    • http://ouhkpthaa.org/userfiles/12257939329.pdfIn PDF document text
    • http://lnyuanzong.com/uploads/files/20210805102258.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/ulhtqgtjje1tpboi60nifdcmh2/nabuwikepivokovupagefa.pdfIn PDF document text
    • http://saintthomasmonrovia.org/clients/a/a7/a774d5b45fc75aba9c6fcf07501e1e58/File/bojuvexisubuze.pdfIn PDF document text
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/k4evip949hftbpmjb17v4pd8c1/gezivepo.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af9b6a3fb14---jofewumidazixudalisolido.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb3d3355ef2---zotumojedolaxijafexa.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/b8955cad7302ec09eae67d9697022209/mizobeveduzelexuvuwefize.pdfIn PDF document text
    • http://ototavandosemesi.com/resimler/file/zurogupixebes.pdfIn PDF document text
    • http://ajmason.com/admin/ckfinder/userfiles/files/kisuraw.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce0894b17a---78687106103.pdfIn PDF document text
    • https://efficimm.fr/userfiles/files/13144432929.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/8lq4eqnnung63umeoki1j9chkm/93249184539.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/tbvcipfkvk4hfletp0f0sg74n5/losoxoxojulozoraratetu.pdfIn PDF document text
    • https://rcvizovice.cz/ckfinder/userfiles/files/76826590743.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607a2c2b4e414---57304398797.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=how+to+apply+a+formula+in+excel+to+an+entire+columnPDF 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_off0000e094.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE094 10864 bytes
SHA-256: e82cc5d921d1fb93b749fa27cd5945edc0e610406ee6fe55122eb439aeafd801
font_01_sfnt_off0000f9be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000111d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111D0 17052 bytes
SHA-256: d001acc32b4231a5b13802037e1b34a808f64794383c566e6ebd21c606b1ff0f

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