Malicious PDF — malware analysis report

Static analysis result for SHA-256 52bc55d1b9ad8ac8…

MALICIOUS

PDF

86.9 KB Created: 2021-09-04 22:52:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: decf961e55721cbf9ab4546c25f213b8 SHA-1: bc7f2910db4a11750a74b6e5d0917abab9f18bc4 SHA-256: 52bc55d1b9ad8ac868621178f7fce5865bb5a068b6d620df1229827de625bdbf
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 URLs pointing to potentially compromised websites or disposable hosting, suggesting a phishing or malware distribution scheme. The presence of multiple external URIs and link farm heuristics strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://irlanc.ru/uplcv?utm_term=promessi+sposi+riassunto+capitolo+1+pdf PDF link annotation
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085666b787f8---65155849830.pdfIn PDF document text
    • http://vattucongtrinh.com/userfiles/file/kesuvezenokefusojidaj.pdfIn PDF document text
    • http://posekatzahradu.cz/files/file/koseluvamiwatavowegeg.pdfIn PDF document text
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/0775c76e51be094aef32dab515c4d11a/34186878249.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609f87065bc17---66640138412.pdfIn PDF document text
    • http://0225674989.kad.tw/kads/ckfinder/userfiles/files/78471079896.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e6fd8c85956---93962967567.pdfIn PDF document text
    • http://www.scsi.coop/wp-content/plugins/super-forms/uploads/php/files/dd15c7dcf0395df3a5c0c4cbc2684d9c/romodukodegexujus.pdfIn PDF document text
    • http://ibtaker.ps/userfiles/file/xezijitarafi.pdfIn PDF document text
    • http://remont-elektro.eu/archiv/file/67119127154.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160acacf67801f---pelititejovuxijidewekuje.pdfIn PDF document text
    • http://arci-mp.fr/admin/File/zojusonamunovoxibokedo.pdfIn PDF document text
    • https://demo.wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/wojedidu.pdfIn PDF document text
    • https://cleanenergy.mn/uploads/files/mebanaj.pdfIn PDF document text
    • https://tadimtursu.com/image/files/baxekidun.pdfIn PDF document text
    • http://shipagents.nl/uploadfiles/file/fazopomigijabatexogotu.pdfIn PDF document text
    • https://mvmdigital.gr/files/files/48259148541.pdfIn PDF document text
    • http://a-swiss.com/upload/userfiles/file/99013160480.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608f080895754---42489682075.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/6j71dc8oeui6hq3ao7481c4ql2/samamepixujepibak.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/d4d7fc3e26c950cf9837bfa6917c2d04/vobanuzakunokep.pdfIn PDF document text
    • http://verkaufs-akademie.com/userfiles/file/16924575326.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1610a9823871f2---velugagavewawagipuz.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_off0000eef9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF9 10932 bytes
SHA-256: 9df9fc3be6e09c854d57493ad2cc331cd72290f381ff2279e8ba4ec88ae0dbcd
font_01_sfnt_off0001085e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1085E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012070.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12070 17860 bytes
SHA-256: f43b05703911423d7b41bb0cac25abb386ae51e715ecc040156c8c8f7f408206

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