Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d8d6e41eb4aaf99…

MALICIOUS

PDF

79.6 KB Created: 2021-06-10 15:51:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 36b2d925903a050408389cc7bcf7ef7a SHA-1: 7cf9a0e8d15aae4558e8f5e53ad76360c8b17c99 SHA-256: 1d8d6e41eb4aaf993890787bb0a06f0e8d583b9ef88e9d880565b47a337e0b7a
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised websites, likely to lure users into phishing scams or download further malware. The presence of multiple links on disposable hosting and compromised CMS uploads suggests a broad distribution effort.

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://queure.ru/uplcv?utm_term=covalent+bond+is+stronger+than+ionic+bond PDF link annotation
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/fcra0rekfgq4as2qfud70ru0j5/zabilexe.pdfIn PDF document text
    • http://www.celso.org/download/kuboxuwirap.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072b9cf85c8f---zafagazalitame.pdfIn PDF document text
    • https://serini-cloud.pl/uploads/editor/file/demozoz.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160805ff82b118---gefejibodipuzumana.pdfIn PDF document text
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/bq2v71vrirp4ullleo6msd626c/bigoze.pdfIn PDF document text
    • https://hanahana.vn/media/ftp/file/kuvilan.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16072069c44fa0---xarasabipawevonerujato.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/ldthrt1k594bj05261kkdgausv/11937303399.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/184hgl89dtr6spiiq461ecr5fr/mezijelipozobija.pdfIn PDF document text
    • http://elsekmont.eu/userfiles/file/lunuvifirudufoxol.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607079399ec0f---fokozonetilizeris.pdfIn PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/tasaveparonagikasuxomud.pdfIn PDF document text
    • http://nensi.si/upload/file/dozoxevunu.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/j2lj7vgm0k4ks1ic03b7usmpk2/jupokomigezivo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f88f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF88F 5304 bytes
SHA-256: 96520e82a3f9c3e4dc03c6c682f9de7c8cccba0710b9fe3b49b731f8161ac248
font_01_sfnt_off00010a8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A8F 11368 bytes
SHA-256: e22e543fec06aac5f1717daf8e9f20a34784c7bd123074c97ef3d750d577e84a

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