Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe5bd07d21bf133a…

MALICIOUS

PDF

89.8 KB Created: 2021-07-29 10:51:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 47b1b413a9a75ddb038c860565eb1263 SHA-1: 2750be91efc238b77805319ea84dbe523b82de6a SHA-256: fe5bd07d21bf133a07469069ad521c98b8f606e8171f04582232237d8ac3a8d5
196 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by an ML classifier and ClamAV, indicating a high likelihood of malicious intent. The file acts as a link farm, directing users to various compromised websites and potentially malicious PDF files, and includes a heuristic for password-protected archive lures, suggesting it's designed to trick users into downloading encrypted malware. No scripts were extracted from this sample, but the embedded URLs and link farm structure are strong indicators of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://forumhrdbekasi.com/webroot/userfiles/files/favefejidelabibarupake.pdf In PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3b7fabb90c---newafuxibijatodasumivipem.pdfIn PDF document text
    • http://budaikepkeret.hu/uploads/file/23313208960.pdfIn PDF document text
    • http://3e-recycling.ru/app/webroot/filesfiles/jemenuvuvo.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/4e0fa15f7fae2651b0c61f1bf4d8b8d7/20987541554.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/75e78fcbb03e241d8b1e6149fdce0911/latururewipesulif.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/1608904936aaf3---vowanuzofepo.pdfIn PDF document text
    • http://freeski.hu/freeski/file/pajerezun.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160b3abb155a78---27779553694.pdfIn PDF document text
    • http://x04ydivan.ru/userfiles/file/xaxuvegabela.pdfIn PDF document text
    • http://tcsm62.org/uploads/news/file/lopinasopunogomof.pdfIn PDF document text
    • http://bahtiyardishekimi.com/fckfiles/file/83013254772.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e67eccf2e6---kifuvojoriwaxezivot.pdfIn PDF document text
    • http://bodymindspiritconnection.org/clients/5/53/53f1eac0d8ee32431a47b4e1af774f29/File/napesimutufosixevozo.pdfIn PDF document text
    • https://alves.bg/ckfinder/userfiles/files/77930123101.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076f56ac152f---85216850116.pdfIn PDF document text
    • https://tiklatakip.com/calisma2/files/uploads/3515846312.pdfIn PDF document text
    • http://myboydfamily.com/clients/7/7f/7f513a2250c12de81a70a6735749c289/File/fejudivegubifibafaxisuz.pdfIn PDF document text
    • http://boathousebrokerage.com/userfiles/file/badilageg.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ab48c42cabb---ketolojonasib.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/23620d472a6bf6c80e3a7ec52c3fc599/ledaf.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/9lnaekp69vv9dfl3lv2kqpltoa/rovobivibu.pdfIn PDF document text
    • http://cjmjwarrickhudsonfamilyreunion.com/clients/9/9b/9be434dcd9982d5451de1b36a82eb828/File/xoriw.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/56158f9e8dd00f2855fb20a246f28d23/28769178495.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/nuzutaxemez.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+unprotect+excel+sheet+without+password+onlinePDF 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f9d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9D7 10888 bytes
SHA-256: bac1eb80a46a686a59dca34ec89d4268cc74dca854a08e95c7e8c7ce690d3775
font_01_sfnt_off000112fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112FA 17548 bytes
SHA-256: 9019457743e90d0490f9c7b24dd39888e43ee74aa5ec21478fc1b6c63c30535f
font_02_sfnt_off000140ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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