Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e1d145fb49960c0…

MALICIOUS

PDF

112.5 KB Created: 2021-06-28 21:17:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: a45b30037aceedd7808e64de2aaba014 SHA-1: 86b18a335fed640d99d086842fff7d31a411ad21 SHA-256: 1e1d145fb49960c01aebd458aee02e1d2bd75be62e3c2d44d4bc41efca9ba831
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with a malicious document designed to lure users to compromised domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/b61g52aacg7oesg7djqs1om62g/44423449436.pdf In PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160984ef2c777f---refelu.pdfIn PDF document text
    • https://bloomeng.com/uploads/supidovov.pdfIn PDF document text
    • http://labcoop-jsc.com/wp-content/plugins/super-forms/uploads/php/files/2q2apoaj2ps9vvejp77upv8qml/34271193943.pdfIn PDF document text
    • http://francescofesta.it/userfiles/files/jugoriredimudafobudav.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16075231f0aece---wasoroxusa.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bade35db88e---81223423488.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/20gte2i8lvuvlrf5lqnft8apkh/novosovarax.pdfIn PDF document text
    • https://agentcctv.com/userfiles/file/68938360209.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ac8fec98289---68026130840.pdfIn PDF document text
    • http://skiflogistics.ru/userfiles/file/melonuruzonoze.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af3aa806efd---58133573761.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210522115045253957767.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/9fe0fc82f4c343a702a2fe3c30c80195/43352331500.pdfIn PDF document text
    • http://hutergroup.de/userfiles/file/12170110687.pdfIn PDF document text
    • http://schokozentrale.de/idata/lunozu.pdfIn PDF document text
    • http://windmill-bv.com/userfiles/files/82266669235.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160c9368e9fbeb---bigaruxapovus.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/c84g0ufa97620qs7hefrf47sr5/delazifudenebojogevo.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/913fd0e2629753a83f53131364770f1c/55195334859.pdfIn PDF document text
    • http://carefirstwalkathon.com/clients/8/89/89514deb4c0e8807eb046cac28c4977f/File/xepukesinajezarebuxop.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/16085a6111edc9---37447515103.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=free+angel+cards+heal+your+lifePDF 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_off00015622.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15622 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00016e34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16E34 17776 bytes
SHA-256: 3eb4e1e776f5f3e82a2eaa5452bdcd74d077058e6483e00f4310db2db0ecdcb0
font_02_sfnt_off00019c3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19C3A 10848 bytes
SHA-256: abf4303c5a81eb69af092ea16f7f28a1e12c3ff8abae454d99c05a64900f9bb3

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