Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c3f6566c0e7ae68…

MALICIOUS

PDF

83.7 KB Created: 2021-08-31 05:21:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 323ba05e71f87f17f9469114d31db9e0 SHA-1: d1acda3353c1c85627eb6b3f49cbd5a70961274f SHA-256: 2c3f6566c0e7ae68b4e0a29509572e6bd346ce83bd1eaa9668a62282944e43a0
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV, indicating malicious intent. It contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, characteristic of a link farm used for phishing or malware distribution. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically points to this behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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 http://blfimmobiliare.com/userfiles/files/53396320624.pdf In PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/ddjmge57je0d56g9r8f9fn0sk2/24294809397.pdfIn PDF document text
    • http://standardamulet.com/files/files/25423157961.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/ldd8ruo0ki5fi91m448g117qda/rutabisatu.pdfIn PDF document text
    • http://veterina-hrib.cz/user-uploads/files/morivapedozogawevubu.pdfIn PDF document text
    • https://lightingsystemscol.com/wp-content/plugins/super-forms/uploads/php/files/7afd41239e99f48e21d2962a070eed6f/kifenawajemadokulixe.pdfIn PDF document text
    • http://toptoptraining.ru/img/upload/file/somemuvodevipag.pdfIn PDF document text
    • http://sosonomo.com/ckfinder/userfiles/files/51359974970.pdfIn PDF document text
    • https://escaletravel.com/userfiles/files/dozewolananokovizozugaw.pdfIn PDF document text
    • https://agentcctv.com/userfiles/file/xagufiduvotowoxowaduw.pdfIn PDF document text
    • https://rm-parketi.si/uploads/lijuzonumuxaw.pdfIn PDF document text
    • https://braintreeclinics.com/app/webroot/img/files/29425057916.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/9665d9df2778a436cae1a86c8d3d7ac1/wametuge.pdfIn PDF document text
    • http://cosmickino.ru/sadm_files/83597628831.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f52fbe3010---pinelosuxajud.pdfIn PDF document text
    • http://euro520.net/userfiles/file/16231406171864512614.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c30381ca79---25303642379.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbf5bca9049---lenik.pdfIn PDF document text
    • http://burchiellati.com/file_fck/file/dufupiribijimep.pdfIn PDF document text
    • https://dubaimotorcycletours.com/uploaded_images/files/tapuj.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607002e435e20---33254057888.pdfIn PDF document text
    • http://aytekinpolatel.com/image/files/68968809981.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/76814248723.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/61972586858.pdfIn PDF document text
    • https://abe-rdc.com/userfiles/file/12663988985.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=do+not+overdrive+your+headlightsPDF 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_off0000df97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF97 10808 bytes
SHA-256: a13bddca2d559a788be831160787954c74963e18e77b21f0308e397d238f4cc4
font_01_sfnt_off0000f841.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF841 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011053.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11053 18744 bytes
SHA-256: 739334c698f62b557cdd627dab75f2e6ded9c39cfab11b0151eb43ada319352e