Malicious PDF — malware analysis report

Static analysis result for SHA-256 1da8ca2d1decb45b…

MALICIOUS

PDF

102.6 KB Created: 2021-07-02 07:30:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 7060ef8377ceadeeec4bc74bb00dc524 SHA-1: 92fc7f476bbd41fd61211de358f0e619fa09c1fa SHA-256: 1da8ca2d1decb45b0b500b9ff4b543647b920aa15c46f8750d448edb4020fb39
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress sites and disposable hosting domains, likely for phishing or malware distribution. The presence of embedded URLs and the nature of the link farm suggest an attempt to exploit users through deceptive links, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

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://drafthe.ru/uplcv?utm_term=starcraft+real+scale PDF link annotation
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/uefek8l36pv81ms4hfgahs2g75/29844895288.pdfIn PDF document text
    • http://ufnk.fr/app/webroot/files/file/6779474175.pdfIn PDF document text
    • https://mayurherbal.com/userfiles/file/kerodixolesaxewesimu.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/06e3831e92aee16eea75a7b620d942c6/ganeku.pdfIn PDF document text
    • http://hopkinshigh1961.com/clients/878968/File/12046843477.pdfIn PDF document text
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/7558b44f88ac553e0f37c492c1e3de98/81772012723.pdfIn PDF document text
    • https://bettyloupaints.com/userfiles/files/37799391731.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/75860808578.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/16073875cc5064---3933225789.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a29674efd55---69841322030.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160b8a94e6cc8d---muzesojop.pdfIn PDF document text
    • https://vieiras.pt/imagensprodutos/file/67688195382.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/160bc25e0b5e83---65648848571.pdfIn PDF document text
    • https://binarbaidservices.com/public_html/userfiles/file/towuniwavatif.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b40b0ef07a4---gututuwesakenitixugatifur.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/99f9038982c344acd5ec6c0d0df1d3e7/rerelapar.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160cbeca8e6c61---tigilipep.pdfIn PDF document text
    • https://aucordechasse.fr/vosImages/ronunusud.pdfIn PDF document text
    • http://esistore.be/userfiles/file/83344252453.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/alfo13as29hqff5d5jb24k7ch6/17381865968.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f29efdac9a1388cb013cd44baa053c72/tufepoginonib.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16081e19f76b1b---tedovagagoreloziwulidili.pdfIn PDF document text
    • http://deshdunya.com/blogimage/file/64729758294.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_off00012ddd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DDD 18508 bytes
SHA-256: 62b7f6f77536b2928f7e601048a3241709dc2f2e9fa4a76de5134da0af04ac14
font_01_sfnt_off00015ee6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15EE6 10088 bytes
SHA-256: bf0f4e86285aa395d94725c515c6d34d7702080f3530cc4c6920462fd852ecaf
font_02_sfnt_off00017586.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17586 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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