Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8ebec60201f1275…

MALICIOUS

PDF

73.1 KB Created: 2021-07-22 03:49:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 5860170611b712ba2e3354118fa74529 SHA-1: 6bd77706ec84d587d244ea7675f18f01472418a1 SHA-256: d8ebec60201f1275bcbc65af8755514dde8a170d52acb72ee780421ef482414d
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute malicious content or conduct phishing. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of numerous links, including one to a compromised WordPress upload directory, points towards a tactic of using compromised infrastructure for hosting malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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 http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c79aba57804---kabiw.pdf In PDF document text
    • https://learningsolution.ca/userfiles/files/tuzopivajubelaxizoraxik.pdfIn PDF document text
    • https://bikidi.com/UpFiles/WebEditorFiles/file/pevudox.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/gagoguvureravaxodo.pdfIn PDF document text
    • http://high-keenltd.com/userfiles/file/18251120424.pdfIn PDF document text
    • http://101-games.ru/images/uploads/files/zepukexusuvuzunarubo.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/7jdk0u06llc3sbp7mgnjqr37fb/talabajona.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074999ac4463---23022449242.pdfIn PDF document text
    • http://burragebrothers.org/demo/jolie/beta/userfiles/files/matidetoji.pdfIn PDF document text
    • http://narcisse.sk/editor_uploads/files/pumalofine.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160e4beb4594e8---wugis.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160870220eede1---dolizosakonefubabetomugep.pdfIn PDF document text
    • http://chnli.tw/CKEdit/upload/files/37421246082.pdfIn PDF document text
    • https://onelineservice.it/file/54511464833.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afd0ecadc34---suwizevuwazixo.pdfIn PDF document text
    • http://balone.net/_upload/file///karazivorizajanonij.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160840d9e29887---volewila.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/vowiwov.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160994f68a60a0---23487727587.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608fbb63efdfd---71427382843.pdfIn PDF document text
    • https://www.orthovision-lublin.pl/ckfinder/userfiles/files/62892564451.pdfIn PDF document text
    • http://delve-cr.com/uploads/80313488048.pdfIn PDF document text
    • http://xn--h1aaebajlcgx.xn--p1ai/sadm_files/lufopagavabuluwukezazor.pdfIn PDF document text
    • http://jouezadomicile.org/clients/4/49/49939bf6a151252ba1adfe53d1befa29/File/satokasonowarisevagotiw.pdfIn PDF document text
    • https://zabulgaria.org/userfiles/file/nagawufuder.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=adf+tutorial+for+beginners+pdfPDF 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_off0000bdb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDB3 10896 bytes
SHA-256: 2c1ac7344bb19c5035ba7875db5d820917fc1d8581b129c54bf7c82257886fc7
font_01_sfnt_off0000d68e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD68E 15392 bytes
SHA-256: 113544765d4d028d627d2cf623ba0d8b4a25a720a328777242553ad7d5ea3151
font_02_sfnt_off0000fdd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDD6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1