Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b562d30e59f887b…

MALICIOUS

PDF

87.5 KB Created: 2021-07-28 02:05:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 3ce602b7f7b2b3127480201258b8048c SHA-1: a23547107b0bff30e61fa85b4dfe6ad2f7e2ba12 SHA-256: 0b562d30e59f887bf4aea0618fa7064af3799ce8b75dc34e3d2b37c2a5c798b4
156 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a link farm pointing to multiple WordPress sites, many of which appear to be compromised, suggesting a phishing or malware distribution campaign. The PDF document itself is heavily obfuscated and contains no readable text, further supporting its role as a malicious container.

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://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/09ae3e9c7a1896aa107d72d464961e32/55955230944.pdf In PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/be5dba8f14c94674dc523f9e5c26a7f6/15806214001.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a5e22fedcf2---52206085436.pdfIn PDF document text
    • http://zaragozalawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/senuzusi.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/aa1b4dcdaed231353843a08e7b052776/10457353786.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5b4afcc5cd---15986388927.pdfIn PDF document text
    • https://aduanaldelvalle.mx/userfiles/file/nanikokodunogatetusulu.pdfIn PDF document text
    • http://liubeauty.com/luutru/files/61972152908.pdfIn PDF document text
    • http://www.siscbolivia.com/admin/uploaded/fck/file/rukitutigivigomusupat.pdfIn PDF document text
    • http://orchid-daikanyama.com/userfiles/file/wozutidog.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608288367131b---87054501156.pdfIn PDF document text
    • http://goldenbaycruisesagent.com/userfiles/file/ralulopuvoboj.pdfIn PDF document text
    • http://ninda.vn/userfiles/files/mizowiresodokevixojixivem.pdfIn PDF document text
    • http://builderall.info/userfiles/file/xumuviwifa.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f16d3c912c---xoxeripulebefuluwojujafo.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/c6ef373e28694ffa24db70b0b066f93e/xajeza.pdfIn PDF document text
    • https://anaksemut.com/contents//files/38925311821.pdfIn PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/6dcr7a6fepalng15c2ftlba8fe/sigojajumune.pdfIn PDF document text
    • http://evola.it/userfiles/files/sukurivewifotatuvezov.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e8539b421a---ririjiwanajopetebolepopuf.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a01a2ec007b---kalezogaloza.pdfIn PDF document text
    • http://domainecomps.com/documents/files/vunodatabigevifirisidixaf.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a90173c0372---jebokididakudavor.pdfIn PDF document text
    • https://estoniapools.com/contents//files/tugirubujomozowetiwa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=is+spectrum+having+an+outagePDF 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_off0000efec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFEC 10892 bytes
SHA-256: 85eeddfd6299cc2528c43711641b72a28809ecacd3cb360552a6fe21ddb82424
font_01_sfnt_off00010904.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10904 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012116.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12116 18012 bytes
SHA-256: b336342db5ef94735083fe7fd9906190afb65851ab7f7727212b02270ba71917

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