Malicious PDF — malware analysis report

Static analysis result for SHA-256 b81ab16a77e1e0ca…

MALICIOUS

PDF

73.5 KB Created: 2021-06-09 14:12:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-24
MD5: fac659b5fd8860eed02aa721d9179c6b SHA-1: 93fb8ce0f45476b5ed708ca201ad9459c4b4460b SHA-256: b81ab16a77e1e0ca46219603564865a0555cc4d69b4f4c699f92080b73ffaa7d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF document is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress sites, and one specific URL related to a 'Roblox bot followers generator 2020' lure. The presence of embedded URLs and the nature of the links suggest an attempt to redirect users to phishing or malware distribution sites, likely exploiting PDF vulnerabilities for execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://drafthe.ru/uplcv?utm_term=roblox+bot+followers+generator+2020 PDF link annotation
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/8sitvr2e5hvgmo26cil6i1g3e2/35443837731.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b276c685f23---14155578501.pdfIn PDF document text
    • http://travellightnepal.com/userfiles/file/xazigimowazedesegogubegup.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b23a6776a459d5cab7f6f0c43073bc1b/73850357139.pdfIn PDF document text
    • http://amoy-art.com/Upload/file/mesatumukipijugojepuvaweb.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/c27d6e03fc2eb749a9e7073395b07933/kijuzemajisawesanunofan.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/1e189234aea9d3aa47cd581bab0c4659/wesipitesos.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16076af406bcdc---67167632649.pdfIn PDF document text
    • https://thedestinbeachhouses.com/wp-content/plugins/super-forms/uploads/php/files/9a0ec332a9da868c05538bdb75df4d65/gabewej.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/54bdf4eb4a85fb1387698fdb50c6867d/50682982478.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/a12438404e53c9f52fae86f23cf9c264/femenunaw.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/1570563841607b7964fe9cdf643e5e98/97462010780.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16097fe3dbbcfb---30628137434.pdfIn PDF document text
    • http://workcoop.org/fckeditor/userimages/file/20210603172712.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160beb17c297c5---nazamimuveniwobedomi.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9867174245---piramodus.pdfIn PDF document text
    • http://ck-tct.ru/userfiles/file/zujoma.pdfIn PDF document text
    • http://kimwendelldesign.com/ckfinder/userfiles/files/lafujimadopizelonorofij.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d4bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4BF 5256 bytes
SHA-256: 5e4e6ba8e8aa9e267b6083705b4c2ab5dccce95a265056b98905e2c302e6fd7b
font_01_sfnt_off0000e6c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6C4 10616 bytes
SHA-256: 0c4c2c6c043a1b9cb6a1b21fe6add697a17607712a3b5308bef84063d8c37cd2
font_02_sfnt_off00010ac2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AC2 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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