Malicious PDF — malware analysis report

Static analysis result for SHA-256 a89024d0cdda5ebf…

MALICIOUS

PDF

83.7 KB Created: 2021-09-12 01:29:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: aa9d5c8e0903835c6f06b9bb54a7d146 SHA-1: d24df0c81e1effdaa8ff822635c8807f60383161 SHA-256: a89024d0cdda5ebfd7ac20bb289bcb4146992d50e133b80aa79f446ff7ab397c
156 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating it is a link farm hosted on compromised websites, designed to redirect users to other malicious or unknown URLs. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links. No scripts were extracted, but the structure and URL patterns are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://www.taxivanclass.com/uploads/ckfinder/files/junefojofit.pdf In PDF document text
    • http://grawerlik.pl/userfiles/file/4274553796.pdfIn PDF document text
    • http://numere-mopede.ro/mm/file/vibafotifukagevisap.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/a25dba8ff698c19179dc61fae309b29f/semewiwubakiwekuzexid.pdfIn PDF document text
    • http://lightofislamonair.org/uploads/files/jigijibovavurofuxojafo.pdfIn PDF document text
    • https://btcauction.vn/hinhanh/file/43819324649.pdfIn PDF document text
    • https://cincia.ro/ckfinder/userfiles/files/35258720541.pdfIn PDF document text
    • http://diysmart.net/userfiles/file/25973266764.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161394bf31dab8---64921447622.pdfIn PDF document text
    • https://dampinggame.com/calisma2/files/uploads/17421458427.pdfIn PDF document text
    • http://kamerton.nl/clientfiles/87642937948.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/462e94e0bd949b63b8a5f34d09359906/makepejawapozavirogikow.pdfIn PDF document text
    • http://mmdplus.com/userfiles/files/20210903_163039.pdfIn PDF document text
    • http://asbazainville.org/userfiles/file/45902333473.pdfIn PDF document text
    • http://werkschoenenverkoop.nl/images/docman/files/reror.pdfIn PDF document text
    • https://wct.goldcrownresort.com/magazine_files/files/pomuxinokikubuki.pdfIn PDF document text
    • http://vouchertiket.com/airplane/ckeditor/uploads/files/45208877662.pdfIn PDF document text
    • http://gmei.lt/ckfinder/userfiles/files/58923584721.pdfIn PDF document text
    • http://veterinariomauracotti.it/userfiles/files/28721930197.pdfIn PDF document text
    • https://hanyauntuktesting.com/contents/files/59140782544.pdfIn PDF document text
    • http://freestyler.cz/img/file/98481454949.pdfIn PDF document text
    • http://expertsystemgroup.com/file_media/file_image/file/wixufo.pdfIn PDF document text
    • https://kanalprofi.at/UserFiles/file/giduwinokibo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=how+do+i+check+itunes+balancePDF 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_off0000e266.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE266 17864 bytes
SHA-256: 7ffacd37a5580222e2d54bc75ce63e1a0f6b80acfc79cfb0c91e1708899c67d2
font_01_sfnt_off000110d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110D8 10776 bytes
SHA-256: a40c7d83d219b4ea86b08cfd950889f60209b5acf4cfa397d08192775fd9bbf1
font_02_sfnt_off000129a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1