Malicious PDF — malware analysis report

Static analysis result for SHA-256 c81e6a837041dad4…

MALICIOUS

PDF

84.4 KB Created: 2021-09-23 12:09:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 91a163d8fc68a6486326ebd7b7b3909a SHA-1: d80872efd59675f710e530d46ac798be7fda7aac SHA-256: c81e6a837041dad44348e252ff40e04a63a96ac61fe53e765733017ea375e744
212 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF contains embedded JavaScript and numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting an attempt to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery. The presence of JavaScript points to T1059.007, and the overall nature of the file suggests it's delivered as an attachment (T1566.001) and exploits client execution (T1203).

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 9

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://mimpishiosatu.com/contents/files/9915652549.pdf In PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/bvq9ku85dp9od1squ9ib40k0p3/88205372663.pdfIn PDF document text
    • http://trevelci.ru/ckfinder/userfiles/files/nerufatazamuzinifajubuxov.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/977ba16c473e8e17e69f2494c1f65d5d/71927533776.pdfIn PDF document text
    • https://eqonetech.com/upload/userfiles/files/44736019540.pdfIn PDF document text
    • http://ambulatorioveterinariovianello.eu/userfiles/files/pasedozusejumusukekegoxi.pdfIn PDF document text
    • http://ylgems.com/file_media/file_image/file/61579748105.pdfIn PDF document text
    • http://aptekainternetowa.net/_mdm_apteki/file/2151028607.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/02bc8082c59277f8be4830b0730f4351/50097707738.pdfIn PDF document text
    • https://pulsekb.ru/admin/ckfinder/userfiles/files/52477841609.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/i1b48h54ufb3vp84nqvh7htt0g/noxizoxufode.pdfIn PDF document text
    • https://flomogroup.com/upload/files/rudepolaxemudupidar.pdfIn PDF document text
    • http://dh-cell.com/ckfinder/userfiles/files/24548945561.pdfIn PDF document text
    • https://limsurempat.com/contents/files/xurik.pdfIn PDF document text
    • http://nassagroup.org/app/webroot/js/ckfinder/userfiles/files/fimetelekajowofefe.pdfIn PDF document text
    • http://paitoonbox.com/userfiles/files/tusativopufusiranabixobu.pdfIn PDF document text
    • http://budapestpainter.hu/ckfinder/userfiles/files/rogejewizumefegumoro.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/16ee588d2eccce41c1851fa17498509f/xironikesotezobima.pdfIn PDF document text
    • http://brette-animation.com/userfiles/file/lanalukop.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/161315eaf15de0---badomiramu.pdfIn PDF document text
    • http://poorclarescork.ie/images/48739972285.pdfIn PDF document text
    • http://weldingplaza.com/files/file/9153643779.pdfIn PDF document text
    • https://madeirashopping.com/userfiles/file/74609364350.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=video+resolution+changer+apkPDF 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_off0000e3a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3A7 17916 bytes
SHA-256: 4c75d954ffd8a43bbd1c7bd92693699f9255be6c38ae98c0e5a584d6c2172619
font_01_sfnt_off00011269.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11269 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012a80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A80 10952 bytes
SHA-256: 7cf161c0beeb941abc376d8aea6efac90e92529757edf6605cacda063d801bf5

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