Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa634877f78eb34e…

MALICIOUS

PDF

79.0 KB Created: 2021-09-13 16:06:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 78a00d75b5fe12b24e838faf56a647fd SHA-1: b4c8ebf05dcdda46b40b52ab392f5eeaf809a7bb SHA-256: fa634877f78eb34e9bb505b22cea61456715f07799b8c16a1c839a86e98f9b38
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to lure users to potentially malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://a-xian-coat.com/uploads/files/202109010037176509.pdf In PDF document text
    • http://goldcoil.com/uploadfiles/files/mirikegafapopad.pdfIn PDF document text
    • https://777mto.org/contents/files/71004278503.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613052510a09f---96843302236.pdfIn PDF document text
    • http://cansuyu.org/resimler/files/jademefovaduka.pdfIn PDF document text
    • https://hiperaktivite.info/userfiles/files/51649764947.pdfIn PDF document text
    • http://szjg.hu/images/file/78967536558.pdfIn PDF document text
    • http://netart.hu/userfiles/file/48829731039.pdfIn PDF document text
    • http://jodhpurheritagewalk.com/images/file/tepusunoruni.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16130eaa80b677---sedezupesa.pdfIn PDF document text
    • http://ud2-140.com/files/nezugigife.pdfIn PDF document text
    • https://zenithservicos.com/userfiles/files/13207110831.pdfIn PDF document text
    • http://canshu.dlzj.net/upload/files/20210904181424842509.pdfIn PDF document text
    • http://ggbris.com/slbdavbatala/userfiles/file/xudolepusukaf.pdfIn PDF document text
    • http://pivotal-technologies.com/userfiles/file/88260179463.pdfIn PDF document text
    • http://lamekatus.ee/uploads/ckeditor/files/4758364776.pdfIn PDF document text
    • http://energy-labels.nl/userfiles/file/nidulalekujokeligi.pdfIn PDF document text
    • https://www.sensiblemachines.com/ckfinder/core/connector/php/files/vuxukuruk.pdfIn PDF document text
    • http://allseasonsart.com/uploads/fck_uploads/file/9594087047.pdfIn PDF document text
    • http://ballmillfactory.com/d/files/46588549379.pdfIn PDF document text
    • http://handlpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vosuxomujexo.pdfIn PDF document text
    • http://lor-rostov.su/userfiles/files/xilugepabezasedit.pdfIn PDF document text
    • http://giaodantanthaison.com/Images_upload/files/kabiforodoxubejowewu.pdfIn PDF document text
    • https://budgetparking.ca/admin/uploads/file/4321165022.pdfIn PDF document text
    • https://nusamulticentralestari.com/Uploads/userfiles/files/7316476878.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133977f0d685---6456686778.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=data+link+layer+protocolsPDF 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_off0000d3e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3E5 16656 bytes
SHA-256: 9ff0ea0cdd2132592274c9c9a10385261b84317ed98009c457899607d3b97ff2
font_01_sfnt_off0000fe41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE41 10576 bytes
SHA-256: 9e0266f989f481d7a159625375dcf1793ccdde0c0326cb7175574e62fc34976a
font_02_sfnt_off0001168d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1168D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1