Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7e72b995f09c5c5…

MALICIOUS

PDF

84.1 KB Created: 2021-09-14 00:43:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d0fb22f09476979dd180139d7f4cfaff SHA-1: 5e39460d653b47b05454118fef49c81d888ef8c7 SHA-256: f7e72b995f09c5c5f2cb6128d36ed701bbc7a9502125b1bbc6dd4295f706d2df
96 Risk Score

Malware Insights

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

The PDF file was flagged by an ML classifier as malicious. It contains numerous embedded URLs that point to compromised CMS upload storage and disposable hosting, forming a link farm. The presence of these links suggests an attempt to manipulate search engine rankings or distribute additional malicious files, rather than a direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 5

  • 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 http://pomelieagency.com/userfiles/files/54067088130.pdf In PDF document text
    • http://darangyi.com/userData/board/file/mitidezovujimosugolipevig.pdfIn PDF document text
    • http://agisinfo.ru/uploads/content/files/rimuxusukireni.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d0f45801e0---43821809694.pdfIn PDF document text
    • http://unicaconsultoriarh.com/images/files/lugiluximegesomunalumevi.pdfIn PDF document text
    • http://vet-arrighicolangelicristilli.eu/userfiles/files/pegikaweledezo.pdfIn PDF document text
    • https://onlineadda.organicemall.com/ckfinder/userfiles/files/burosix.pdfIn PDF document text
    • http://goodwill.pl/userfiles/file/gobemoto.pdfIn PDF document text
    • https://indiansabroad.uk/userfiles/file/29810009490.pdfIn PDF document text
    • https://khyatiinfotech.biz/ckfinder/userfiles/files/zumavala.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/245c77f77368643692edd3cdceaceeb4/73633468192.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161385d985199b---nigowosasosafikixigune.pdfIn PDF document text
    • http://handsonmontessoripk.com/userfiles/files/famepubesanozosu.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/1613fbd0a892ef---jaxinesesi.pdfIn PDF document text
    • http://ckattorneys.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kawivaravamukijeferelav.pdfIn PDF document text
    • http://cbcom.eu/ressource/site-image/files/notovulelakajiveronaxisej.pdfIn PDF document text
    • https://assignmentmart.com/ckfinder/userfiles/files/fesavebofaxulojorolitu.pdfIn PDF document text
    • https://loyallcanada.com/editor_files/file/1454472297.pdfIn PDF document text
    • https://mots.alaxarxa.cat/cmsimple/images/file/kiwifatobumikare.pdfIn PDF document text
    • https://movimientofamiliadejesus.com/images/uploaded/file/nuzadisakezazowawisava.pdfIn PDF document text
    • http://sushimura1.com/uploads/files/14971308348.pdfIn PDF document text
    • http://scarpatti.com/files/jewefukamobusod.pdfIn PDF document text
    • http://abwingsjanaf.com/uploads/files/biziduzebo.pdfIn PDF document text
    • https://zzhqhi.com/d/files/safawapedut.pdfIn PDF document text
    • https://www.informacion-indoorclub.com/boletines/img/file/vugudavikelimu.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f392f75f83---neluf.pdfIn PDF document text
    • https://5a.ro/ckfinder/userfiles/files/24702833645.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=get+trial+followers+instagramPDF 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_off0000e18f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE18F 10684 bytes
SHA-256: ae4a704f47946bcaad4fa3a5c37c3402b6564cbb3d267633f69b153dbbde6f23
font_01_sfnt_off0000fa20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA20 18532 bytes
SHA-256: c63e1a256a99f9fb0a61cbf7868d0ae5d77297e5634c96fffd5368da501bb0b3
font_02_sfnt_off00012a40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A40 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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