Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2732e58e18e3b23…

MALICIOUS

PDF

92.9 KB Created: 2021-07-19 01:46:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 550268e586ddcf74b95a9a283ae5abc6 SHA-1: 8eb84d69935f313c5a3ada2e1acb25bc4890dce3 SHA-256: c2732e58e18e3b233dc7dcfade366968d7908674c5811fb65bb4eb0d64731354
176 Risk Score

Malware Insights

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

The sample was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm used for phishing or malware distribution. The presence of PRC/3D content is also a known indicator of malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

Heuristics 7

  • PRC/3D content in PDF medium CVE related PDF_PRC_3D
    PDF contains PRC 3D content. PRC/U3D parsers have been a recurring Adobe Reader attack surface; treat as a related parser-exploit indicator rather than a specific CVE match.
  • 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://hferrynetworks.com/FileData/ckfinder/files/20210706_1C4A77BBD1287E9B.pdf In PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608ebb7743df4---9207995991.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a11493a53e1---vijakukizadarud.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b1f8cea4ab---pasujepuxufazuke.pdfIn PDF document text
    • https://mamo-tato.ro/userfiles/file/68600978756.pdfIn PDF document text
    • http://casier-a-bouteilles.com/file/raderamirotukumar.pdfIn PDF document text
    • https://genesislighting.net/wp-content/plugins/super-forms/uploads/php/files/2b1fdbc4f004eb1d5b925939b18d00b3/26163653598.pdfIn PDF document text
    • http://sieuthikhoacaocap.vn/upload/files/43042193573.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/38788sj14qu2iqk89hiab1c0ep/lukotujenugesajujesen.pdfIn PDF document text
    • http://banhangcongnghe.com/upload/FCK/file/pikewavonopamajakafi.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b6623cbd739---dupili.pdfIn PDF document text
    • https://cncostruzioni.com/userfiles/file/leporasiwew.pdfIn PDF document text
    • http://rocincorporated.com/domain.com/images/dynamic_pages/file/jugotiniguwiwotadaxagejuw.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/82166aa728f74ee30985fc4441de7956/86642743243.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/f9r03uh66s49vn4p9s8q29abei/jumuwigavojo.pdfIn PDF document text
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/27fdrf7ucjjtq46olanik8o0vm/71799291999.pdfIn PDF document text
    • http://firegallery.ru/img/upload/vutelagokoguvapo.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/9457f6e57f463990a2fe271ab188affe/nepolenomaxona.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/16088c328434a7---6160944332.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/be60460b0b421958e8b44ad2b38f9efa/rozurom.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021051811172284.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=family+and+friends+6+workbook+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_off00010906.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10906 16764 bytes
SHA-256: 2202fc3c126e88e99aea27d8c38e924646183a516384ed73e52076fcfcaff745
font_01_sfnt_off000134d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134D6 11140 bytes
SHA-256: 6ab928dce2c658ee54b07ad5bb4cf6d7ce3de3c4bcbf1ee83b70bbf9663691c3
font_02_sfnt_off00014ea5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14EA5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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