Malicious PDF — malware analysis report

Static analysis result for SHA-256 21fcedbde61a83d0…

MALICIOUS

PDF

74.1 KB Created: 2021-09-04 09:04:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c5990781707de3faaff84999384c4ccb SHA-1: 0105586821ed3f54e20b3a81c486c739ca76edd3 SHA-256: 21fcedbde61a83d0047e78cef05fe3dd2f74fefdf4834668801d081ed6aeafd3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document flagged by ClamAV as Pdf.Phishing.Trojan. It contains numerous embedded URLs pointing to various websites, many of which appear to be compromised WordPress installations or disposable hosting. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates a link farm on disposable hosting, suggesting an attempt to distribute malicious content or phish users. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://allytemp.ru/uplcv?utm_term=arabic+letters+with+pictures+pdf PDF link annotation
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/101bf534e1f01fa87b4c085ccecf0761/90599634490.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/co8c4g7sjgjplh559ta8076inb/42111071594.pdfIn PDF document text
    • https://actorconseil.com/files/file/fagokego.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c0ca3015485---94948792171.pdfIn PDF document text
    • https://hostessima.pl/userfiles/file/10738683012.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070a129ed232---dufurexe.pdfIn PDF document text
    • http://hoanhaochemical.com/uploads/files/18012429536.pdfIn PDF document text
    • https://baust.edu.bd/app/webroot/ckfinder/userfiles/files/vuvukexiriwuje.pdfIn PDF document text
    • http://grupposcorcia.it/userfiles/files/vepakatudarubepetiromuti.pdfIn PDF document text
    • http://hairfibers24.com/upload/file/xefimigiwajexelo.pdfIn PDF document text
    • https://barcelonacentremedic.cat/files/galeria/files/34215488324.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/160765f65c39d7---62319684483.pdfIn PDF document text
    • https://toskov-yordanov.com/userfiles/file/34191306286.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/dd8c09d40db89ef6c244ba995ce753f6/56249088118.pdfIn PDF document text
    • http://detskaoptika.cz/ckfinder/userfiles/files/14696828187.pdfIn PDF document text
    • http://northstarbaptisttyler.com/clients/a/a4/a4b4c2e389351fb2dee96c3f727c6a57/File/70364691710.pdfIn PDF document text
    • http://lnv-cnc.com/userfiles/file/kazoko.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16083040bb1799---meveteralidejodadem.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16100534dee5c4---fezev.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/grph5m995h34spn424qtac0rn0/gegivas.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a8f7badc865---gulatewuneveme.pdfIn PDF document text
    • https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/07c16e5835c884fdc03fff45fd939997/14769988212.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c325330fd3---52138719028.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/770b2f395164b90167df9d7a6338d14a/27072211785.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16100b5de25f56---81863657108.pdfIn PDF document text
    • http://mfcwestenkwartier.nl/beta/userfiles/file/gotag.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_off0000bfb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFB7 16456 bytes
SHA-256: cbb55b83081d80ec0e6339e6c3ee6ae4628ea24c54e87bc3b892ede7858c63b5
font_01_sfnt_off0000e9fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010215.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10215 10800 bytes
SHA-256: 9651cecefc507d98b7fbb6e50926dc1da122b9fc178bcab863c3b5c845af8003

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