Malicious PDF — malware analysis report

Static analysis result for SHA-256 777ec9ffbc4f1706…

MALICIOUS

PDF

166.9 KB Created: 2021-06-15 19:51:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 911851a700e48a7bc3d1daf63e2732f0 SHA-1: 435b89f8402a8d9da79a72ff2bea834bc6b03abd SHA-256: 777ec9ffbc4f17068321a85169dfabdaea8d79c119b9cb706356d1f143bf5c3c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • 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.
  • 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://philabc.ru/uplcv?utm_term=movie+sora+aoi PDF link annotation
    • https://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607e4ba4e2f9c---36513127319.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2544acae77---xaxabupepufupixoguk.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160862ec8e84d4---21823284529.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607690724f105---lijuwifiroji.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160bcc6922824a---fenud.pdfIn PDF document text
    • http://studiolegalezullo.eu/userfiles/files/76034644620.pdfIn PDF document text
    • http://staresecurity.com/userfiles/file/gomiteramajelu.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c5c352cee27---jemijazesugubipalaxusi.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ec4ed5fbaa---60717057046.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e8ece5caec---nutafope.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/i6lqeeldl2j3atd9ec7t0ouat7/21957706376.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082a008c66a7---fovugol.pdfIn PDF document text
    • http://kyanite.tv/userfiles/file/80115774136.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/a0a34cb445f172eb94783e60e3e2b5c2/keledagexodononinak.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/cc82fdb1567bec5a008de40e15001bcc/1474933878.pdfIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://www.gnu.org/licenses/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off00013a24.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x13A24 76180 bytes
SHA-256: e6447184e14161cdce16f982eb272010d7f4fcf60476f8afcd5ab1346b0778a5
stream_004_off000232bb.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x232BB 10392 bytes
SHA-256: 9cd3bae0b9de252fd4a0ecffdcf5e3e08c16da35bd6095c2a1655dc6ad673ad9
font_01_sfnt_off000222a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x222A6 4712 bytes
SHA-256: 01bc0038b586076b01aa45fa3ba04e37991fb6e786312b6511cf64c1b278a76b
font_03_sfnt_off00025027.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x25027 12164 bytes
SHA-256: 3ec84805206da5ad5b036ba34bb0e68accff463e322fd2e27f8d21517bb2533b
font_04_sfnt_off000278d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x278D4 16092 bytes
SHA-256: c9557d91917e40dbb2ce09b7ef560a04a9a832ffe2ebcac6b50408a58351272e

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