Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8fe0f8f632e6529…

MALICIOUS

PDF

75.3 KB Created: 2021-09-06 06:52:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 5690ab7901cde76d98ea345e9847e0a0 SHA-1: 023709b6ae238501b6caa8ef08a0caee67b94758 SHA-256: f8fe0f8f632e6529d95a03d257e6b1c296650dbd742bb63fa2c2ed1e04a32249
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous links, many pointing to compromised WordPress upload directories, suggesting it's designed to lead users to malicious content or phishing sites. The presence of link farm heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609eaca451c41---zulubixu.pdf In PDF document text
    • https://vipbeachhouse.com/uploads/editor/file/74421740825.pdfIn PDF document text
    • https://dacinsara.ro/fckfiles/file/56375800656.pdfIn PDF document text
    • https://www.cpro.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1d5885b30---mugomivapi.pdfIn PDF document text
    • http://transportdiverse.com/uploads/files/71888406698.pdfIn PDF document text
    • https://peintures-descours.fr/fichier/files/gunud.pdfIn PDF document text
    • http://www.autoservis-hubatka.cz/admin/upload/ww/file/45926108323.pdfIn PDF document text
    • https://creativenursery.net/home/creative/public_html/ckfinder/userfiles/files/67921488671.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160716f4f40997---muratiguxomoro.pdfIn PDF document text
    • https://studiorampinelli.com/file/lurisobafu.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/31h9hfuqfu5injki5fp2s26vk0/zadefufi.pdfIn PDF document text
    • http://chelseafoodmart.com/uploads/files/gerovabobokawijabimazexix.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/160a968768054f---42844157971.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/pvmho7h3b39p9ttqao2ekkojeb/kinarijamimokiwifofe.pdfIn PDF document text
    • https://sanipacific.com/attachment/file/8492285950.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160f75b7a27ec3---8765233700.pdfIn PDF document text
    • http://montpellier-businessplan.com/mbp/upload/images/images/upload/ckfinder/16444070483.pdfIn PDF document text
    • https://cfaegaianascente.pt/portal/userfiles/files/58400002931.pdfIn PDF document text
    • https://deniz-sogutma.org/img/userfiles/file/71848439592.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4dfcf6c63b---mesitaluxipisovovup.pdfIn PDF document text
    • http://eltonltd.ru/sites/default/files/uploads/94976201353.pdfIn PDF document text
    • http://fsoa.cn/userfiles/file/junepumomejezol.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609c9eb185cbd---sesimutodefofo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=herzberg+theory+pdfPDF 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_off0000c4dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4DD 10508 bytes
SHA-256: d6048fb03424f3dedeb5b0240a4027d0396bbcdbb08bd8c391ea45222390f85e
font_01_sfnt_off0000dc76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC76 16960 bytes
SHA-256: f44c68aa5ab7741256d0101295758ca5e8cc9f558a97dc939da33e4c59d6ae71
font_02_sfnt_off000107f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1