Malicious PDF — malware analysis report

Static analysis result for SHA-256 8437da33a33aed53…

MALICIOUS

PDF

75.8 KB Created: 2021-10-02 20:53:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 968c7c85964a3fc0456e423e5dc50737 SHA-1: 5266143944df1d6f3466307c869df227743c5830 SHA-256: 8437da33a33aed531aa8ca5cadc48cdae637ae7f459ba80cc3e8c6cc40f71c44
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised or disposable hosting domains, indicating a link farm designed to lure users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The file's structure and URL patterns align with common techniques for initial access via malicious documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://campfun.myhost888.com/upload/ckeditor/files/dinememefam.pdf In PDF document text
    • https://www.cylinder96.ru/admin/ckfinder/userfiles/files/debixi.pdfIn PDF document text
    • http://bpabv.nl/uploadfiles/file/rogozinawasugavula.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1615889d2e34cb---72230370456.pdfIn PDF document text
    • http://tongrentangthai.com/UserFiles/file/tojimanaredixogiperulabif.pdfIn PDF document text
    • http://alda.pl/ckfinder/userfiles/files/49027603865.pdfIn PDF document text
    • https://ladulceseguros.ar/noticias/fckeditor/file/31743698077.pdfIn PDF document text
    • http://gramercy-grand.ru/files/file/1705610956.pdfIn PDF document text
    • http://dobraukraina.org/sites/all/sites/dobraukraina.org/files/fukujivegegozib.pdfIn PDF document text
    • https://digiconelectronics.com/media/37315331640.pdfIn PDF document text
    • https://karaari.leaddeehub.com/userfiles/files/jukelez.pdfIn PDF document text
    • http://technology-mp.it/userfiles/files/tebuxonakojutijaveruz.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161352d8530ad1---wafapuluk.pdfIn PDF document text
    • https://indianhairtransplant.com/ckfinder/userfiles/files/58626572289.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145489acd62e---43851174947.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/3q03qeffokqgqpqojf2rl2qe3k/46351988201.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133c7889185f---3134886768.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614beb0023323---gexamid.pdfIn PDF document text
    • http://tnetimes.kr/upload/file///53347064699.pdfIn PDF document text
    • https://automatisme-portail-bordazzi.fr/userfiles/fichiers/2256356728.pdfIn PDF document text
    • http://acunambalaj.com/adenoto/upload/files/sogowatonibonadopilalap.pdfIn PDF document text
    • https://gaziemirkentkonseyi.com/upload/files/10073512760.pdfIn PDF document text
    • http://ristoranteibucanieri.it/userfiles/files/ribodevekolipimunibeluk.pdfIn PDF document text
    • http://bagliodeimille.it/userfiles/files/90139052673.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=roman+patricians+and+plebeiansPDF 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_off0000c179.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC179 18332 bytes
SHA-256: 1982b9b214994ee4a89a5c42ebcf56b8e470cfb80188839ffcb37573da90bee9
font_01_sfnt_off0000f0aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0AA 10860 bytes
SHA-256: 0c2584578658efe2afba9e5a76efd1ccee95486c0936d255fa662053b140696b
font_02_sfnt_off00010980.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10980 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1