Malicious PDF — malware analysis report

Static analysis result for SHA-256 7083e392c0aa0be5…

MALICIOUS

PDF

75.2 KB Created: 2021-09-11 09:53:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f5e5c6641919f0ce3fe21519643e878a SHA-1: 4187019fc9f01b1c7c62bea950fa71bb839b8d0d SHA-256: 7083e392c0aa0be5f529d8496999a7abe51cb0bd0e8eac9d9e9b92343f265467
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://ketchas.ru/uplcv?utm_term=snaptube+pro+apk+latest+version PDF link annotation
    • https://anna-bel.com/app/webroot/files/userfiles/files/rulapaxopimil.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///30445077048.pdfIn PDF document text
    • http://alajwakh.com/uploaded_files/userfiles/files/raropitexedelalixeben.pdfIn PDF document text
    • https://synersys.fr/contenu/file/sefusibax.pdfIn PDF document text
    • http://mofrantech.com/userfiles/file/67532601924.pdfIn PDF document text
    • http://soles2walk.com/data/file/89008159375.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f6aa33c8a3---tinaduluze.pdfIn PDF document text
    • http://sun-green.nl/ckfinder/userfiles/files/68266592982.pdfIn PDF document text
    • https://o2opr.co/userfiles/files/18459445059.pdfIn PDF document text
    • http://archi-m.ru/userfiles/file/razaz.pdfIn PDF document text
    • http://qianxish.com/ckfind_image/files/49882789723.pdfIn PDF document text
    • http://integrotech.eu/zdjecia/file/xovogalerikamud.pdfIn PDF document text
    • http://lumieye.com/userData/ebizro_board/file/73396122555.pdfIn PDF document text
    • http://www.hgbehringer.de/img/files/files/reletifazajikefebujowu.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/d5aeb06a2efc8d5d71bdd76bbb8c97f9/11407663266.pdfIn PDF document text
    • http://trieuduong.com/images/Download/67943792112.pdfIn PDF document text
    • http://papinchess.ru/userfiles/file/19046481174.pdfIn PDF document text
    • http://sipsak.nl/userfiles/file/29470540496.pdfIn PDF document text
    • https://mp2020.csysadmin.com/ckfinder/userfiles/files/ketokesederuwamisijaboze.pdfIn PDF document text
    • http://xn--b1adrijbbb.xn--p1ai/upload_picture/77955446191.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612f7301cb92e---33824276171.pdfIn PDF document text
    • https://szallas-karpatalja.hu/upload/sijasexeperirarid.pdfIn PDF document text
    • http://satakantaresort.com/user_img/files/93981521303.pdfIn PDF document text
    • http://belly.bpv.su/content/files/files/rasikos.pdfIn PDF document text
    • https://marjoyunlar.com/calisma2/files/uploads/79013823501.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_off0000c18e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC18E 17228 bytes
SHA-256: 4d002e2b7582b24a897566c9c59d3cc1caee0bd354c4fc312974ac0f307ef5f2
font_01_sfnt_off0000ee4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE4D 10716 bytes
SHA-256: 6f02d35a8542cfac457fb89e210411156fc76ba590fdef00a335ed9981672eb7
font_02_sfnt_off000106cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1