Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c63f70190155313…

MALICIOUS

PDF

82.2 KB Created: 2021-09-10 19:29:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3500a78a764bf75a9eeb3180f2071454 SHA-1: e7fa6ee5f7103c9815bb1a1223f0155d8a02ed1f SHA-256: 2c63f70190155313e1a9db3d931f5f8f53846b4561cb112776755ee0689f886c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to compromised CMS uploads and disposable hosting sites, often with UTM parameters suggesting a phishing or scam lure. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing attempts to deliver further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139c3170d427---mojedelamogewowigegove.pdf In PDF document text
    • https://binarbaidequipment.com/public_html/userfiles/file/gofebekasekojomenuvezeki.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161357dbb0f29d---gifezigewafipinup.pdfIn PDF document text
    • http://www.johnrealestate.in/ckeditor-ckfinder-integration/uploads/files/madotozitujikimemakeve.pdfIn PDF document text
    • https://djennebeads.com/nbloom/fckuploads/file/vubatuvafarifosid.pdfIn PDF document text
    • http://snieznik.pl/userfiles/file/18803150870.pdfIn PDF document text
    • http://xn--h1agcmh.com/ckfinder/userfiles/files/luxutifexomupurulidat.pdfIn PDF document text
    • http://ristoranteyuri2.com/userfiles/file/2296757342.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16137da8612f87---4310309399.pdfIn PDF document text
    • http://chothuexeninhbinh.net/data/dulieu/files/25823707499.pdfIn PDF document text
    • http://ex2010.com/uploadfile/file/2021090601374573499.pdfIn PDF document text
    • http://shiokuda1.com/contents/files/wogujomimobuvewuravusimew.pdfIn PDF document text
    • http://xn--80aap0abfiql8h.xn--p1ai/admin/ckfinder/userfiles/files/sobujotalivovi.pdfIn PDF document text
    • http://zygzak.eu/foto_dane/wysiwyg/File/dafuvimojilapos.pdfIn PDF document text
    • https://nmcs.ca/userfiles/files/49913547983.pdfIn PDF document text
    • http://clinton.abwingsmd.com/uploads/files/1325383016.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/161387a1c2736a---57873633227.pdfIn PDF document text
    • http://jongauger.com/userfiles/file/nobime.pdfIn PDF document text
    • http://nutronicltd.com/userfiles/file/xexozadifazenizevegunud.pdfIn PDF document text
    • https://dalba.net/other_files/File/nifotamitisabevewutema.pdfIn PDF document text
    • http://getrade.net/uploadfiles/file/rogetomodavapibegiturena.pdfIn PDF document text
    • https://seerupit.dk/assens/file/73537380824.pdfIn PDF document text
    • https://zapcdn.space/web/img/podborky/files/kekejorazozijezujuw.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/16139fa5467694---45887634508.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=download+rfs+real+flight+simulator+modPDF 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_off0000dd36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD36 17200 bytes
SHA-256: 69da60ec0bff35fc6312c330cadc8cd8edb182e4b35a308f55a65a24681bf8e6
font_01_sfnt_off000109af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000121c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121C6 10988 bytes
SHA-256: 502cc3f8b47e88078f487271c8f7a693218dd4981d2f4853f67994cb04f39fce

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