Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8cfe2a5a0b70cfe…

MALICIOUS

PDF

112.0 KB Created: 2021-08-21 04:30:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 11c859df3b88173bb60e8026a50cfcf1 SHA-1: d4234ac4a17c69880b35d16bf213bb6a1deb5549 SHA-256: a8cfe2a5a0b70cfe9af0a72f445cd2e759cfb5df8626b3fd8ef57ca1a2661c4e
144 Risk Score

Malware Insights

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

This PDF document exhibits characteristics of a malicious lure, employing a visual download button and password instructions to trick users into downloading an archive. The presence of numerous links pointing to compromised WordPress upload storage and disposable hosting suggests an attempt to distribute further malicious content. The ML classifier strongly flagged this PDF as malicious, reinforcing the assessment of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://smidgel.ru/uplcv?utm_term=electrical+technology+by+b.l.+theraja+pdf+download PDF link annotation
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/161203b001af6e---derawelevep.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d09e6bc627b---1451479912.pdfIn PDF document text
    • https://autoteam.in/ckfinder/userfiles/files/13644205501.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610a171bea104---falosezoraratelex.pdfIn PDF document text
    • https://rugsinc.in/UserFiles/files/kipibenigubinepew.pdfIn PDF document text
    • https://carparts-fixture.com/file/file/maxilupotedi.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/bq0m6i0u5us308r8lf0if9g982/2147972233.pdfIn PDF document text
    • http://soflocops.com/clients/67403/File/gunilovesux.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160739a547a36a---76275039418.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/3955d9950c2fb67924b1a4103a4ca46d/xopunorebakejupo.pdfIn PDF document text
    • http://centrons.com/uploaded/file/186490968160c5bcdf4304f.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/p2vde45tr186egi3nob6ohdt72/jewoxowosajatugix.pdfIn PDF document text
    • https://vansuloi.com/uploads/userfiles/file/lamelak.pdfIn PDF document text
    • http://architettobotteonpierpaolostudioabacus.it/userfiles/files/71398472479.pdfIn PDF document text
    • http://staropolski.net/Upload/file/soviloronupuzibomebera.pdfIn PDF document text
    • http://siltherm.com/ckfinder/userfiles/files/soxotigojutiv.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160b487d33684e---63285085148.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608eb1044c10b---palopotekopewajudusux.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160d25289b4960---nevivajerepap.pdfIn PDF document text
    • http://muntepa.com/userfiles/files/24648936621.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000130df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130DF 11252 bytes
SHA-256: 622b9511e38acc53dbce71db0988e57147540ad1e289561cb97399c8129b2bd9
font_01_sfnt_off00014ac5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14AC5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000162d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x162D7 20820 bytes
SHA-256: 62a7e8025426776d899d7ec6fbeefa1c8b1101cd07103d7ed48e87423f9bdadc
font_03_sfnt_off000199da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x199DA 16348 bytes
SHA-256: 4152195cc6a36eb785a7a1e2541e89b5c116e2146fcc68a24c10bca802df5fb1

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