Malicious PDF — malware analysis report

Static analysis result for SHA-256 82fb4c53c7b6ed58…

MALICIOUS

PDF

99.0 KB Created: 2021-07-31 18:16:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 0db19442671057ca8157fd8a8a2dc9d8 SHA-1: 943b1475307a6a7e9ba5084977e21c2a74a8e874 SHA-256: 82fb4c53c7b6ed5849cd8989f184b07d612d92aa7e63779c87cc6d855847aae7
196 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. It uses a password-protected-archive lure. 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 0.9921

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://catamma.ru/uplcv?utm_term=how+to+reset+bios+password+on+hp+elitebook+840+g1 PDF link annotation
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/cb40e19c0981505fee7fcac1043ed903/jedofafenini.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/07aa2f530aabd32fad3a75e87f01ff04/9163740032.pdfIn PDF document text
    • https://paklya.su/design/img/upload/file/6762860061.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/e68d3f93ba55cff0f63ff46ed92cf80e/gamirureneworudovabi.pdfIn PDF document text
    • http://broadgatecapital.com/userfiles/file/55233409211.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/balezenoduvejiredibi.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160915f36549c6---xumewe.pdfIn PDF document text
    • https://debcopharma.com/userfiles/file/25834775609.pdfIn PDF document text
    • http://www.onlinetemsilci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f1467b659d---43013623350.pdfIn PDF document text
    • https://earplighting.com/wp-content/plugins/super-forms/uploads/php/files/5dc42f596ab42d0fa4b9fc15bb263d7c/69339836212.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/921fatjm2jflhl2vqj2v9q7706/xoramotuzajugakigojol.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606c81c6eae50---15203529619.pdfIn PDF document text
    • https://palcev.ru/userfiles/file/56585552082.pdfIn PDF document text
    • http://chistogood.ru/admin/ckfinder/userfiles/files/weraroxaxugoxikuj.pdfIn PDF document text
    • https://blugarden.eu/file/jupobenesuzajizuwitu.pdfIn PDF document text
    • https://capital-tic.com/upload/ckfinder_temp/files/20210613101541.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/61f9cc644bf901d24e2822b48678cd32/mudozu.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/567650388d18d4913a2c79620cb2d3b2/94207043253.pdfIn PDF document text
    • http://614move.com/clients/4890/File/66944084908.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16081ce75eb2a2---76826700951.pdfIn PDF document text
    • http://beergolfers.com./blog/images/file/duzotozagopazubuv.pdfIn PDF document text
    • http://aviteksural.ru/admin/ckfinder/userfiles/files/93047656001.pdfIn PDF document text
    • http://mobilesamara.com/img/files/file/defigagikikup.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_off000112af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012ac1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AC1 17928 bytes
SHA-256: ed5af6032dc6a41803f064aad9c0e81336f177bf1b89a1ee0e7e9773d0f144a9
font_02_sfnt_off00015a1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A1C 11440 bytes
SHA-256: a99ff663bdb6cf07f603d8ae77482998ee630c130d49549083ed3838e4c9a65e
font_03_sfnt_off000174ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x174AE 1760 bytes
SHA-256: 478d64aad58a46c60a63c2bd6d05d9c39068b35528f549688063ac651822ff24

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