Malicious PDF — malware analysis report

Static analysis result for SHA-256 7819712c87ecfb4c…

MALICIOUS

PDF

66.9 KB Created: 2021-06-24 09:52:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 4eea59bd0958673e93181555fc411cb6 SHA-1: 6c54964caf3a6af1760982210654cb1233e77eb0 SHA-256: 7819712c87ecfb4c8190be405036980f5767977aa5e9eb003e2ec52e4980412e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/1hmm5re9n3rg6qlgrapodh63gv/soxadusolexunuwine.pdf In PDF document text
    • http://rhodeislandalpha.com/clients/56223/File/90042113747.pdfIn PDF document text
    • http://aptchasers.com/FCKeditor/userfiles/file/duxelizubidaxu.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4384543b27---sigekonimuz.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/36381293d5d5f6dd4427e340259e627e/pozipik.pdfIn PDF document text
    • http://nanoscopy.ru/uploads/files/78077344635.pdfIn PDF document text
    • https://karapinarinsaat.net/userfiles/upload/file/58285303564.pdfIn PDF document text
    • https://dcoderesearch.com/uploads/tobevutubabebupixe.pdfIn PDF document text
    • http://microlana.com/ckfinder/userfiles/files/fegusegebota.pdfIn PDF document text
    • https://bcbc3399.com/upload/files/vakefiferevimubefagamo.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/3f9lhpb35j0lr6dj4veb4pr1n3/sozetirona.pdfIn PDF document text
    • http://aklond.com/UploadFilesfile/%5C/2021043015000749.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a66ecf5f8b4---88702284726.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/1607fe3f4631d4---dimijiv.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/sukaweg.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-6-23/20210623020929655353.pdfIn PDF document text
    • https://baptistfriends.org/media/41594719561.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/160785541772dd---27470502010.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=guia+propuesta+xxi+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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b936.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB936 4876 bytes
SHA-256: a4d94442e5970bd09a37bd5810d313360a196543eb0bcd03081a4f7bed76b572
font_01_sfnt_off0000c9e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9E9 11428 bytes
SHA-256: a4044551ed1a34a1f2927f2e93049fae756adae8749f7db9c7131bd250da72e7
font_02_sfnt_off0000ee81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE81 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c