Malicious PDF — malware analysis report

Static analysis result for SHA-256 d851a095ddbfe4a4…

MALICIOUS

PDF

97.5 KB Created: 2021-06-12 08:15:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: a85107c51d7c972588f54b41394c3887 SHA-1: 4f602e2818a900b80f03d4047c56752ab35628e6 SHA-256: d851a095ddbfe4a437f3bc2377d0796de1407b9f9d93d3d8164d8144f3ba5d45
164 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to compromised websites, suggesting an attempt to host malicious content or redirect users to phishing pages. The presence of a 'download button' heuristic further supports a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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.
  • 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://garglob.ru/uplcv?utm_term=wwe+2k18+caw PDF link annotation
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/2s3ecub3rvcjqln33cvv3hdkbf/wogaxiwomina.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/e232976a80b7cbb4d535dba8e2348d9d/vefaz.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160a6dd145ef94---26581206840.pdfIn PDF document text
    • http://blbr365.com/userfiles/file/1622182273.pdfIn PDF document text
    • http://cherishedmomentphotos.com/clients/8/84/84fe84b553acfcd191e166b7401b6f02/File/92223442611.pdfIn PDF document text
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/4f54faab4ce0967c572a7aab9a6d7600/kusifeweg.pdfIn PDF document text
    • http://edu-family72.ru/content/images/uploads/file/zitelu.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072de5d227c2---58789990348.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d4c5a6e416---51038709144.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ac359a8d61e---fefokujebafifuduk.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6821e76b83---zagivetememagap.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf8b753809---suwogisumofujezukobeten.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a29188a5fb6---82975472051.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/gkk58v3q1jhpvom9qrsn9ok2k5/25620188946.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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://scripts.sil.org/OFLIn PDF document text
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000101ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101EE 4112 bytes
SHA-256: c147f79abe8d23989d6b593ffdc9e8b24c5247f8b72c0c50ead70aa73f9fac03
font_01_sfnt_off0001107a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1107A 4476 bytes
SHA-256: d8d2a4fca41c5432c66aa0979ade3bdd6f8ffc203aefaa5164e6bbd4afa1b798
font_02_sfnt_off00011f7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F7F 6168 bytes
SHA-256: bd04e930451c65d992f09600c6173be0a48069b0b012098a21e71fe708b6ff57
font_03_sfnt_off00012e63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E63 11288 bytes
SHA-256: 3d64e866ec8acf4edfde759fb77dedd8ece4c04dc9ff7e06e37a7f46a679ae48
font_04_sfnt_off000154e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x154E0 16096 bytes
SHA-256: 111249575db8b1f22194b95e00f38135aa0b0661e8cdf5166e145c3f6f8be878
font_05_sfnt_off000169b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x169B5 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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