Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cfd3d30f835d1e0…

MALICIOUS

PDF

79.2 KB Created: 2021-09-19 23:25:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 83707ce0e834d303077ab04a5c454a05 SHA-1: fc6bfe64328767b344d8ccd07a8a6c9c4f7b89fd SHA-256: 0cfd3d30f835d1e0b43f7d38c09253b13c28d89cc99d8f552b4a779376b20ce3
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The document functions as a link farm, containing numerous URLs pointing to various websites, some of which are hosted on compromised WordPress installations. This suggests the PDF is likely used for phishing or to distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://huntic.ru/uplcv?utm_term=android+optimizing+app PDF link annotation
    • http://darangyi.com/userData/board/file/nugusukefasaxami.pdfIn PDF document text
    • http://c-amc.com/upload/files/84501060843.pdfIn PDF document text
    • http://staropolski.net/Upload/file/nododobuxawuwid.pdfIn PDF document text
    • http://sattosushi.com/uploads/files/28292863262.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/161333fe414d17---26377330651.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612efea557d89---venutiga.pdfIn PDF document text
    • https://siliconautomation.com/userfiles/file/46922050488.pdfIn PDF document text
    • http://jilienjrubin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/42172247991.pdfIn PDF document text
    • http://cesurmakina.com/userfiles/file/vuvowegitaxukofemov.pdfIn PDF document text
    • http://emilygrilltogo.com/uploads/files/85686592421.pdfIn PDF document text
    • http://razaviota.ir/basefile/razaviotair/files/87547734875.pdfIn PDF document text
    • https://terminarz.online/kosmetyczka/krakow/files/59723863205.pdfIn PDF document text
    • https://aprenda-atdi.com/uploads/files/59520587596.pdfIn PDF document text
    • https://aiwcecckolkata.org/FCKeditor/file/99979396143.pdfIn PDF document text
    • http://robertoantoniz.com/resources/original/file/92081342324.pdfIn PDF document text
    • http://bannails.com/fckeditor_userfiles/file/50698857454.pdfIn PDF document text
    • http://sportschoolindex.nl/images/uploads/larikukebutosudumuta.pdfIn PDF document text
    • http://3e-recycling.ru/app/webroot/filesfiles/lojujodotuvamibugidivo.pdfIn PDF document text
    • http://www.mattig-accounting.bg/fisiere/file/damixiwesuladu.pdfIn PDF document text
    • http://pro-group.ru/userfiles/file/xilazoweposatiwemuf.pdfIn PDF document text
    • https://shevtsov-art.com/uploads/files/karuweravugitopu.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146cfd563253---20331788011.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/5816701348.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/a0df619b96287c6a0e4056fd2557c9a7/gunozazexik.pdfIn PDF document text
    • http://hstairan.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/wadozijakug.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_off0000ceac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEAC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e6c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6C3 10432 bytes
SHA-256: 18aad0f8086f45d0798e9299cd82a4449d89a4810063e1f6b62c824f97310843
font_02_sfnt_off0000fe2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE2A 18956 bytes
SHA-256: 51309dc3857ad2c9abae3567b48c2d32d0ae7345715686f5c4a483b04d48e964

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