Malicious PDF — malware analysis report

Static analysis result for SHA-256 70cb82c76a4ebace…

MALICIOUS

PDF

73.6 KB Created: 2021-09-23 19:49:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: fa6b6ca26a30f4923fd85f59d74aa4c9 SHA-1: 8abaa1bd9019bc63e3b10087a51b3fe918e485ac SHA-256: 70cb82c76a4ebace42570d03c029aa629187a842d3eee7fee2d993c97f75d2dd
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a link farm, likely to obscure malicious destinations or distribute malware. The ML classifier and ClamAV detection strongly suggest malicious intent, with the embedded JavaScript likely facilitating the download of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://crewmak.ru/uplcv?utm_term=anatomy+3d+atlas+premium+apk PDF link annotation
    • http://greenhere.cn/upload/ckimg/files/202109201114425068.pdfIn PDF document text
    • http://grafosaleservice.cz/images/fck_editor/file/tidibuzivur.pdfIn PDF document text
    • http://indagosrl.it/userfiles/files/vulikub.pdfIn PDF document text
    • http://pate4me.com/userfiles/file/10139888471.pdfIn PDF document text
    • http://massiimo.com/piceditor/file/25679374115.pdfIn PDF document text
    • https://at2-turbo-j3t.com/contents/files/mipevuxuxo.pdfIn PDF document text
    • http://taiwan-casters.com/userfiles/file/wewexesodubewagogimunuf.pdfIn PDF document text
    • https://basisangka.com/contents/files/bozekuvifikix.pdfIn PDF document text
    • https://digitaldaya.com/imagenes/file/48730366123.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fa38c9bb20---75434953022.pdfIn PDF document text
    • http://homearcky.nl/userfiles/file/77086434745.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/6ct6tmu4h66ol32g08mbp5ialr/xizamaxozokubug.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd0edb1716---9024271337.pdfIn PDF document text
    • https://latrinquette.com/upload/editor/file/zumawugemefageluvijez.pdfIn PDF document text
    • http://anapro.com/ckfinder/userfiles/files/geworoselatefew.pdfIn PDF document text
    • https://888nv.ru/userfiles/file/61531011490.pdfIn PDF document text
    • https://kitapkaplama.com/upload/ckfinder/files/nubilanajabaxinoravi.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/dajorobaxazisanin.pdfIn PDF document text
    • http://abogadosaguilar.com/ckfinder/userfiles/files/joredorogemititugefo.pdfIn PDF document text
    • http://hefei.chinatupai.com/web/js/ckfinder/userfiles/files/donarasefamu.pdfIn PDF document text
    • https://bnbcostaverde.it/userfiles/file/bamexoji.pdfIn PDF document text
    • http://xn----8sbemnkjd7bfu.xn--p1ai/design/img/upload/file/totanaxebexa.pdfIn PDF document text
    • https://giltmorestukko.hu/ckfinder/userfiles/files/2071276078.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_off0000b6f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6F5 18652 bytes
SHA-256: aa6fec4807795b9d8edb570ce96951062785ef11188601e9f832d57d6147eaa1
font_01_sfnt_off0000e782.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE782 11012 bytes
SHA-256: 9e2d996a3bdffb33f87a2ac6e15487be79e9b61ca41929b03719bd4fea9b1ae2
font_02_sfnt_off0001012e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1012E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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