Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f8f33dd4b6f62df…

MALICIOUS

PDF

99.2 KB Created: 2021-06-17 08:01:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: fea98eabf2c715fefa59d127e538ef29 SHA-1: 3c0961af5ec81109bb1f623eb5443dfe173968fd SHA-256: 4f8f33dd4b6f62dffcc4ae6be881c955794334fe63e4f4c84e4e7bbcc6ce7a6e
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 0.9994

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://smidgel.ru/uplcv?utm_term=photo+to+pdf+combine PDF link annotation
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/78ff7e9151938f004f1c48a3cf488583/70350018092.pdfIn PDF document text
    • http://www.deewanalarab.com/up_imgs/77880191395.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/e0ca55f67a3b22ac7fd912fb14b05ff6/96346011388.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/16084571c9d287---mexes.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1608f56c411ec2---23707210342.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1608c69f66d352---giwedizatenegav.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607505a9d5741---92200768882.pdfIn PDF document text
    • http://porpora.info/imagenes/imagenes_contenidos/%5C/69222070275.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/roxulutezosozi.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/menogiborif.pdfIn PDF document text
    • https://armagedonspedycja.pl/files/file/vokuvixubidubo.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/8nt6bglrusame9k2ejhq0aglb4/25906340045.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a136deb90c1---kepamawuruzafukenev.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091a26d532c3---kiruliwanefokipejizixeka.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8777b7715d---vufedere.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/230dc0da6c5e1bb67380eec5306799cf/vadomidisudonuwereniz.pdfIn PDF document text
    • https://alate.org/admin/fckeditor/editorfile/bopudixegasosirijupane.pdfIn PDF document text
    • https://digidatadecolombia.com/wp-content/plugins/super-forms/uploads/php/files/f2dbee2ae161e356f9cfc4c2c28eee6a/fenud.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In 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://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
font_00_sfnt_off00011a6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A6D 1584 bytes
SHA-256: 7652a6638dfdc054fc2814e19b58f5803a6ba636aa8df9679524c2d79c9f0c71
font_01_sfnt_off00012275.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12275 5020 bytes
SHA-256: 78fab76165e89ec3c08fb6e464fdb650ee9804010828bf1a21277697b10fcdab
font_02_sfnt_off0001335e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1335E 3092 bytes
SHA-256: 41e6e99b10617d737f01889771d7b1b3ced7ffc02275dce335d68a6a706ac4f0
font_03_sfnt_off0001409e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1409E 11744 bytes
SHA-256: e9c6f147d75779b8f3a9cd7fe6e3c45a49ea65aba35b85b263dd618930240346
font_04_sfnt_off000168ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x168EF 16336 bytes
SHA-256: 92ca5277a07040a1118e6ffe557fff1b4332eaf15e577e4df2dfa25513d903e2

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