Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e4975fe2dbc3c04…

MALICIOUS

PDF

87.6 KB Created: 2021-08-14 12:30:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a8aa8442dd28627fa14fe7d7a89d3c3e SHA-1: 75db85c9f48e174c56ca30fb13e190570fb2de6f SHA-256: 2e4975fe2dbc3c04157e0a535cb582dd100eff103b1c64bfd2684bf3a61af05e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of links pointing to other PDF files hosted on various websites, many of which appear to be compromised. This structure is characteristic of a link farm used to distribute malicious content or conduct phishing campaigns. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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.lightingsolutionsal.com/wp-content/plugins/super-forms/uploads/php/files/179633cf661a1cc9c2b95d62bbc0bef7/jesiwopa.pdf In PDF document text
    • http://sumtinathholidays.com/admin/uploadfiles/file/29361362904.pdfIn PDF document text
    • https://sindonis.com/userfiles/file/97240385328.pdfIn PDF document text
    • http://sunjewelsonline.com/userfiles/file/3428272158.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160f07dab57e1b---65164724505.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b277810a5ba---sifexebavalokula.pdfIn PDF document text
    • https://cochleartudaskozpont.hufiles/94094729938.pdfIn PDF document text
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/5971108d49942e35a6ac684be17ed68d/86691917249.pdfIn PDF document text
    • http://zerosquareonline.com/file/popiveditiv.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/njtsn1kbft508prnspfdeff91n/dezidelapadapi.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/16073686a8eb10---45493615486.pdfIn PDF document text
    • https://1877painters.com/FCKeditor/file/64793529248.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610d3361a71aa---71552631180.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c30288c50da---womulafarotinivegeribukuz.pdfIn PDF document text
    • https://bisnismedsos.com/userfiles/file/xepekejusa.pdfIn PDF document text
    • https://jagamimpi.com/contents//files/pipodinusuruxunapixafefup.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d0b2fd0f991302ba851990d353381aac/sapabozefimugominorel.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdbb6539446---95724282820.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16083c1a80de3e---lozerofi.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/11efe9f47afe09ae48637331afbdf382/pizoremasewedosalurut.pdfIn PDF document text
    • http://highendschmiede.de/highendfiles/file/vololoriguxadusaru.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/10552456702.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=slither.io+invisible+hack+download+apkPDF 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_off0000efcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFCC 17668 bytes
SHA-256: d7f561ffaa0b9d58d8c2aef819af74c071dbf46592382a33e320591b104a6583
font_01_sfnt_off00011e6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E6C 11136 bytes
SHA-256: 835da0eb7f8ead06faeb866d167cd56ef968e1f4070af90325e4c98b27464ead
font_02_sfnt_off00013832.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13832 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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