Malicious PDF — malware analysis report

Static analysis result for SHA-256 536e8e9c381cdbbb…

MALICIOUS

PDF

72.7 KB Created: 2021-06-30 01:37:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 87ba99f77a794342fa8cdea83b94e581 SHA-1: 899870ca81544c136e0667afd34aaf7e485f6020 SHA-256: 536e8e9c381cdbbba8814f42bf0fa4d1a848f8bae805f5838c4df0286a1024fc
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs that point to compromised WordPress installations, likely intended to lure users into downloading further malicious content or visiting phishing sites. The presence of multiple distinct hosts and the use of formcraft plugin uploads suggest a coordinated effort to distribute malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160920e4321d48---63597756881.pdf In PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/160bd600009640---52826708780.pdfIn PDF document text
    • http://koszyczarek.pl/userfiles/file/damobadezejulerujo.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/ju7nurqqq9pkf6v9jmgcqj1hi8/93882816813.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b3ffb85f192---89221246890.pdfIn PDF document text
    • http://ipceurope.com/assets/file/57396411027.pdfIn PDF document text
    • http://capitalclassof1971.com/clients/4/4c/4c1e4f015ba9b8bec237dc1ca705466d/File/62222344293.pdfIn PDF document text
    • http://nordicaluminium.ru/userfiles/file/20559378037.pdfIn PDF document text
    • http://ed-web.cz/userfilesfile/4559573808.pdfIn PDF document text
    • http://congtrinhnhaviet.vn/upload/files/vorulewudusu.pdfIn PDF document text
    • https://manuscripthandler.com/userfiles/file/nedezurefopezidumitivepo.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/j6v89klp68f4cflcesjn0f949e/solexijegoruwofule.pdfIn PDF document text
    • https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/ff28cf0471fd20c2b44914b2c9eae34a/tovumudonurudilikel.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abd60b7984f---33521947275.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ab25ce79de---niwolafaribe.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160797555acd5b---31970192063.pdfIn PDF document text
    • https://genericdiabeticteststrips.com/userfiles/files/74305777283.pdfIn PDF document text
    • http://surrattsville69.com/clients/8/81/8122276c22396d7fa0996010cc369f50/File/82623477280.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/d4f0bf4cc7fcf038fd80f81f34d71c8e/23014352147.pdfIn PDF document text
    • http://www.cerathai.com/image/upload/File/30858410547.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/ad86e5ce94f492ca8d548b82568172b0/5078156583.pdfIn PDF document text
    • https://atcotourismtravel.com/userfiles/file/zejavosinuvuwaroxigox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=blount+county+policePDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/8870eb953365b9654520dcbacecb912f/vimuluxelaxidezegavutiwon.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bcd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCD9 10204 bytes
SHA-256: b9cf90bcae7aa9b65d9f0134fbb2e1ff7207520a190db6bfc622d7cc3dc8c661
font_01_sfnt_off0000d3e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3E5 16304 bytes
SHA-256: 9140d6f991403db8f42bd5f4c30bfe0d875b4bb7a5693dfc5d7108ca545f7cfe
font_02_sfnt_off0000fdc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDC0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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