Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cb142731e322ae3…

MALICIOUS

PDF

141.4 KB Created: 2021-09-06 22:42:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: a093d213783dc2f035df790236950066 SHA-1: e250b18b0c3a4f6ee3fdee9898adfeab44fb631e SHA-256: 7cb142731e322ae32b885bdf422d22525c29ec10f10200037c127bf0681e8b70
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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 0.9992

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://phukienbep.net/media/files/74778965423.pdf In PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/4626e3a7c7ad9b1b0f5db8adc25582a9/27912602632.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608742d912ab3---41279867491.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/ff7ad62d59930da8410e7af78c2e3f93/29772450783.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/22da89444c0cfc35bd3fe8f005b2dcaf/67992566719.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081b2d5030bc---jovifubugo.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/c51ff9830cfb8b9070fde581f5ae0032/mubusimubal.pdfIn PDF document text
    • http://ranagro.com/files/koxulugiv.pdfIn PDF document text
    • http://myucmas.com/userfiles/file/vanelarunapu.pdfIn PDF document text
    • https://syteq-pro.com/userfiles/file/90651246272.pdfIn PDF document text
    • http://www.sintsprev-ms.org.br/ckfinder/userfiles/files/53911574957.pdfIn PDF document text
    • https://chp-travel.ir/data/file/wafitakudunuxebewo.pdfIn PDF document text
    • https://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/7bbd5b90d32e82fa5fffd79c2382d246/pudimukumoju.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610bd2cb26ba0---23141181563.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/0c295e4c562f420a95e28138dbdb7787/nosagupenogon.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16087f21fe9fd5---midewosuzevideko.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a94855b26eb---raloxadogixozepuni.pdfIn PDF document text
    • http://marthomaiticherukole.com/userfiles/file/bajogem.pdfIn PDF document text
    • https://trexanh.net/upload/files/44523232392.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/52b446v104jvv19bgj0h23l6oa/xaruso.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=kahulugan+ng+wikang+filipino+pdfPDF link annotation
    • 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001cb49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CB49 16960 bytes
SHA-256: 46eee653a3ecba6d7a309c0e3c6720dec507e5f172f5c19f36ff8c253b61b4ac
font_01_sfnt_off0001f782.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F782 10548 bytes
SHA-256: 2495ad001a50d002441da12e9bff4cd07efbbf94e28d2ee71a8b6df1be1aef33
font_02_sfnt_off00020f3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20F3A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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