Malicious PDF — malware analysis report

Static analysis result for SHA-256 41ca2612d256df21…

MALICIOUS

PDF

85.6 KB Created: 2021-08-03 11:56:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c9795b6f2e5d3e8b91218fb70bd7fe59 SHA-1: 8badc3a78a2b9636ff13a6adfbe9ca6a275ba5ee SHA-256: 41ca2612d256df21e91e321518837f782685b7a0b8f67b8a1a4336b426c922c1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and an ML classifier indicated a high probability of maliciousness. The document contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, forming a link farm. These links likely serve as lures for phishing attacks or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://www.llgnjinc.com/wp-content/plugins/super-forms/uploads/php/files/53af1c67300e4d9a3a8002b8c855b866/guwiwewitusazof.pdf In PDF document text
    • http://fixmyhelicopter.com/project-new/christianbook/upload_images/file/21929101242.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6496a861c---sogij.pdfIn PDF document text
    • http://vansuloi.com/uploads/userfiles/file/noverejugapexalafan.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aaec7adc21e---84664052326.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1609470b783cce---45566533406.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/93779f41bb43a6fa2f06e35ae20901a7/55204825143.pdfIn PDF document text
    • http://cioccolatogallucci.it/userfiles/file/82272220095.pdfIn PDF document text
    • https://techlan.pl/files/file/fodolesesojekugino.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609acbe59d2e0---genifiwabel.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/c7daaec7047f4595e7ee9126c23a74a4/32337422618.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160aa8b8ede962---mivav.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086e107d8b0f---91288801430.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/45222295344.pdfIn PDF document text
    • https://glycocalyx.nl/userfiles/image/file/vofefomukege.pdfIn PDF document text
    • https://x-software.cz/data/file/lujaliwi.pdfIn PDF document text
    • https://tucarrorentacar.co/ckfinder/userfiles/files/47396121173.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/f20c5e40758ba8d65d8d886a779e84c3/40711914743.pdfIn PDF document text
    • http://bosch-service-center.ru/uploads/files/74609428460.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/2ppe0susa2n9od3q3bdh0vtum6/jaxonawijerafame.pdfIn PDF document text
    • https://riondene.ch/img/uploads/file/13598328998.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/16085747564873---65232264077.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d635c095c30---fuzivulo.pdfIn PDF document text
    • http://goldcoil.com/uploadfiles/files/80945072021.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=how+to+add+games+in+garena+mobilePDF 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_off0000eab3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAB3 17620 bytes
SHA-256: bd8b441b741b2d13f6d5ce1c76a50c4ab5185f1ade97059efe5c79f272e0c0ea
font_01_sfnt_off00011838.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11838 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001304f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1304F 10808 bytes
SHA-256: 6ecf1f466544954ca902bf03d23f3cd7680c2ba440cbe970c6ffd407a06c77c7