Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1ede39cd034dc43…

MALICIOUS

PDF

72.2 KB Created: 2021-09-09 07:51:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9c937733d600e99ca3d48c40042e3e58 SHA-1: e026c110e799311808307b9b8cec255e43d7eeb3 SHA-256: d1ede39cd034dc4357459622e3e9b3003c41b7a6baa186632cc48e068cee41e1
156 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs, many pointing to compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded URLs and the nature of the link farm suggest an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://oasis-travel.ro/files/vurav.pdf In PDF document text
    • http://parateam.cz/file/dilabelefonasezobe.pdfIn PDF document text
    • https://kme.pl/global/app/webroot/uploads/file/16310720867759.pdfIn PDF document text
    • https://podgoricki-klub.me/userfiles/file/levilofigeguribepi.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/1612f0c2c9ad2c---95693689217.pdfIn PDF document text
    • https://krygina40.ru/UserFiles/File/42627733843.pdfIn PDF document text
    • http://www.bc-arman.kz/ckfinder/userfiles/files/bupifesiwagufo.pdfIn PDF document text
    • http://petra-koparki.pl/Upload/file/velovuroxijiwuzikagimilo.pdfIn PDF document text
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/2ca460f9e5291d95189d68ed56dae6e9/97328413376.pdfIn PDF document text
    • http://taxicityplus.ru/userfiles/file/6043258700.pdfIn PDF document text
    • http://aburobocon2019.mnb.mn/uploads/files/55882351419.pdfIn PDF document text
    • http://agro-pasz.pl/ckfinder/userfiles/files/guwofibeduk.pdfIn PDF document text
    • https://cambodiaangkorhomestay.com/userfiles/file/38387127234.pdfIn PDF document text
    • http://daiichilogistics.com/uploads/news_file/59676618195.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/q2e4548r2b0iqrsoft89kk14kp/zufoponezadugakoposodo.pdfIn PDF document text
    • http://crosswaysrecruitment.com/userfiles/file/kibodavolijuxukar.pdfIn PDF document text
    • https://hopclickhospitality.com/scgtest/team-explore/uploads/files/37023176391.pdfIn PDF document text
    • http://www.giuseppe.ru/ckfinder/userfiles/files/96062200697.pdfIn PDF document text
    • https://marblobaths.com/app/webroot/img/files/92364987036.pdfIn PDF document text
    • https://itracmediav5.com/ckfinder/userfiles/files/gaperepegijefanuda.pdfIn PDF document text
    • http://deleersnijder-bocaege.be/images/file/27538597779.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/c3cee055de711a3abbb114da6ba48cba/rekutojabufukuz.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613933d615d57---ronibute.pdfIn PDF document text
    • https://plasy.com/uploads/file/60464966725.pdfIn PDF document text
    • http://mediedil.eu/userfiles/files/35211627319.pdfIn PDF document text
    • http://dtjxbpzx.com/filespath/files/20210907062023.pdfIn PDF document text
    • http://berallebags.com/UploadFiles/FCKeditor/20210903030530.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=where+can+i+download+psp+games+for+androidPDF 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_off0000bb0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB0B 11048 bytes
SHA-256: f52c3329a39f31b3a5fcf1a36e6b6f4fdc4652f0b71d59c7180cefcc8805cafa
font_01_sfnt_off0000d45d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD45D 14976 bytes
SHA-256: 572b25e05344faaed47ae26fd69cd534453f543f3d1dfbbdd840e1b5d441409e
font_02_sfnt_off0000fa34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA34 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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