Malicious PDF — malware analysis report

Static analysis result for SHA-256 62e1cbcd6089dc29…

MALICIOUS

PDF

82.1 KB Created: 2021-08-07 01:43:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: 3ff678b7512ae3b37b25302eb2260ce5 SHA-1: c5262c62da2234306cc8a18e00d65b5e355ce446 SHA-256: 62e1cbcd6089dc29070435851ff14716397bf8ce3c92273ffaa69b625b3fbbf0
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF phishing trojan by ClamAV and an ML classifier. Heuristics indicate it functions as a password-protected archive lure, a common technique to evade gateway security. The embedded URLs, such as 'https://medvor.ru/uplcv?utm_term=bluestacks+tweaker+2019', likely serve as download locations for subsequent stages of the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://medvor.ru/uplcv?utm_term=bluestacks+tweaker+2019 PDF link annotation
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/k6nq8g5gfotnkke30qvji8hon6/tumep.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160982e184c162---taresumebebixinetumoraxak.pdfIn PDF document text
    • http://jar-ted.pl/file/dadukusilotaredi.pdfIn PDF document text
    • https://lacecinella.com/writable/public/userfiles/file/xibeburibulorida.pdfIn PDF document text
    • https://www.brightfieldbusinesshub.co.uk/wp-content/plugins/super-forms/uploads/php/files/dd4nc60v9jahjoa177qqd1e860/28216142395.pdfIn PDF document text
    • https://efckrakow.pl/userfiles/file/38350707564.pdfIn PDF document text
    • http://arunimaflavours.com/userfiles/file/vuzazawow.pdfIn PDF document text
    • https://tbsva.org/Upload/files/20210708235512.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c6a7829822---48509539689.pdfIn PDF document text
    • http://gramercygrand.ru/files/file/50879388612.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/73906ea29b95b0372f65687d8768e698/jepudowanatanukajusugijul.pdfIn PDF document text
    • https://mb-classic-service.de/userfiles/file/sanalokumumaguwibe.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ab1e61db77---75993536237.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078549f2511b---56588622098.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc94c3987e6---59921464798.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/160b97a8c35f3b---97655937286.pdfIn PDF document text
    • http://bendhigh1970.com/clients/1/10/106e6567aa8bd3cecf4080670b11bd10/File/vaduziwikawuba.pdfIn PDF document text
    • https://trimix.bg/UserFiles/File/nidigosozabixedikopu.pdfIn PDF document text
    • https://asiarsolutions.com/userfiles/file/lobimuro.pdfIn PDF document text
    • http://creaorganization.com/depo/sayfaresim/file/puzonituf.pdfIn PDF document text
    • http://calzaturificiocatia.it/userfiles/files/60593457466.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/ri8kkafm6ggarg6kfldgenp3u5/17723749365.pdfIn PDF document text
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/pq3ud1grjmg56h1bnr9j1t6np1/40993979178.pdfIn PDF document text
    • https://poojaindiangrill.com/nbloom/fckuploads/file/nubitakosapude.pdfIn PDF document text
    • https://vandolderskb.com/images/usr/wuxozalusosubakekewe.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_off0000da4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA4A 17604 bytes
SHA-256: 10327e3d15cfde30aa81ecf2ea40926975d3eb982d7e2b1703a8a1e32cb80fd6
font_01_sfnt_off000107d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011fe8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FE8 10700 bytes
SHA-256: f38d1837538da89d7513455229107cb7266679d0a09d18c5e9afae758bc17fdc

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