Malicious PDF — malware analysis report

Static analysis result for SHA-256 d710e5a365fd6fa4…

MALICIOUS

PDF

97.6 KB Created: 2021-07-17 07:12:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5d31d365ca476b2c70b8cf7fefbc8b9d SHA-1: 3b337160ac7cc69d2f300d70e0b026eb3c7f588d SHA-256: d710e5a365fd6fa477600326e78ba26cb1f23ed7d58fd7aa2e7fa4c588221e66
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to other PDFs hosted on compromised websites, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of an attempt to trick users into downloading further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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 http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090cbe3e6846---gomojabezexowoxixovagugaz.pdf In PDF document text
    • https://alutat.com/data/file/romumape.pdfIn PDF document text
    • http://rayanchem.com/d/files/88584133863.pdfIn PDF document text
    • http://nwatchonline.net/userfiles/file/gefukovudomifuw.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/7dd115e935566d33bc5fe0e193586b0b/jaraz.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609bd454dcb14---51333879712.pdfIn PDF document text
    • http://thaidicattery.com/clients/f/f7/f7b4890cfba443994123e46b8078d6bd/File/nikixavatifekupid.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/jevawilifo.pdfIn PDF document text
    • https://www.brightfieldbusinesshub.co.uk/wp-content/plugins/super-forms/uploads/php/files/5pajfhtavktetkm8mefn7tpokv/sisepawapiv.pdfIn PDF document text
    • http://narcisse.sk/editor_uploads/files/notokobomove.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/59964440759f2cdfc8baa97022cf889b/52241522129.pdfIn PDF document text
    • https://sibconsulting.com/contents//files/bevifekubawowogi.pdfIn PDF document text
    • http://beateromer.com/bilder/file/46240023919.pdfIn PDF document text
    • http://bigandtallking.com/userfiles/file/levejalezezuzepat.pdfIn PDF document text
    • http://trustarshida.co/cache/fck_files/file/noviluzefamekixopelapaka.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/abd54409928fd32cb5bf7eafdabc4ee7/52571271309.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bca6fa960b---deguwajupoxurodisif.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d113f871e8---62930960842.pdfIn PDF document text
    • http://pinzimoniofiumicino.eu/userfiles/files/58816224930.pdfIn PDF document text
    • https://tempegaring.com/contents//files/83282100306.pdfIn PDF document text
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16074fb0c5cf31---37703308873.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/dm52idhdqsl0q1mdh9lcg4m7r2/11445982203.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a589e06dfac---sewisevovesuvegesago.pdfIn PDF document text
    • http://paradisetnl.com/FileData/ckfinder/files/20210714_99EE0FA48CC93408.pdfIn PDF document text
    • http://mentaplywood.com/images_upload/files/joroxovosesexekobozovubur.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607e6cb4a569a---30743544023.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=shooting+bench+plansPDF 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_off00011a0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A0F 10768 bytes
SHA-256: a2b2ca8a0f29d17f4f9486f197bbf8cea4833cfefcbb2780681a2c6ed679ec09
font_01_sfnt_off00013290.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13290 17200 bytes
SHA-256: 9b3c40a6e783183282c821b929f1427bfd47ad4946673fd2c96a03734ba4dd48
font_02_sfnt_off00015fa6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15FA6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1