Malicious PDF — malware analysis report

Static analysis result for SHA-256 5641363e27783f53…

MALICIOUS

PDF

77.2 KB Created: 2021-09-01 01:52:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: f83542188e17d189698436fcdcb011bf SHA-1: ce9145f1fd5c8e26871e0810dd14603955888e13 SHA-256: 5641363e27783f53673d2d383e1c0cf514a64741d18f6a2abde3d5524b2cb1f6
156 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised or disposable hosting, suggesting it functions as a link farm to distribute further malicious content or conduct phishing. The presence of external URIs and link farm indicators strongly supports a malicious link-based attack pattern.

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 http://kasystemofkarate.com/clients/861259/File/fowakovapagamun.pdf In PDF document text
    • https://pmrmhss.com/userfiles/file/31571221738.pdfIn PDF document text
    • https://xtrafitcoaching.com/www/images/files/vuzutizatilire.pdfIn PDF document text
    • http://lateonsettay-sachs.org/userfiles/file/morakilelakemoxifaxi.pdfIn PDF document text
    • https://acryl-bg.com/userfiles/file/musugafaxoku.pdfIn PDF document text
    • http://ferrogep99.hu/static/media/file/16229185843.pdfIn PDF document text
    • https://seedomoretravel.com/files/files/jixop.pdfIn PDF document text
    • http://immodraft.nrw/images/architekten_agentur_images_/file/befuvofun.pdfIn PDF document text
    • https://totounited.com/contents//files/23811072517.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///54632309459.pdfIn PDF document text
    • http://urgentcarepb.net/userfiles/file/sewidebirijalo.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdc3dea2bb6---radam.pdfIn PDF document text
    • http://01host.ru/userfiles/files/xozif.pdfIn PDF document text
    • https://makiriaszto.hu/ckfinder/userfiles/files/maniwewoguzarivaga.pdfIn PDF document text
    • https://norservis.info/files/files/61169192421.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16083d55ba0faa---56716492652.pdfIn PDF document text
    • http://horizonpestservices.com/userfile/bolazijelawe.pdfIn PDF document text
    • http://smenergy.kr/uploaded/file/1599784149610645187d925.pdfIn PDF document text
    • https://baoholaodong24.com/userfiles/file/38429472677.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/lu1spcg1k3nc9mbh8u5lig6d3a/kupegilenulunavaxorudaga.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/16100f28321248---45826674051.pdfIn PDF document text
    • http://righetti-ticozzi.it/userfiles/files/27317643435.pdfIn PDF document text
    • http://rjbmachinery.com/d/files/8130354060.pdfIn PDF document text
    • http://kowalstwwo.pl/public/cms/images/file/fuwulowexuref.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=sprint+purification+of+potable+waterPDF 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_off0000bfb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFB9 21072 bytes
SHA-256: a6031f3976cbac3acce3c09c2ca425cad85570c29fc7fb81564d7ed98203be63
font_01_sfnt_off0000f667.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF667 10704 bytes
SHA-256: 295e155649a77b8ac820b4f42dcd86c400778e5979cfcc814055ca5939a7f548
font_02_sfnt_off00010eef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EEF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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