Malicious PDF — malware analysis report

Static analysis result for SHA-256 c92c4ca8ece8a628…

MALICIOUS

PDF

81.8 KB Created: 2021-09-24 00:44:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 14c0434a7bb3165df29ed604a6225947 SHA-1: 597cc500c18286f9f144d184e441ac8e166c2a12 SHA-256: c92c4ca8ece8a62853df73e8dee7c09a3c9c9273c73471b80a27d32833a100b5
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document flagged by ClamAV and an ML classifier as malicious. It contains a link farm pointing to various PDF files hosted on potentially compromised or disposable domains, suggesting a phishing or malware distribution attempt. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to open a password-protected archive, a common tactic to evade initial security scans. While no scripts were explicitly extracted, the presence of external links and the overall structure strongly suggest a phishing or downloader attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://winso.tw/userfiles/file/95138962483.pdf In PDF document text
    • https://vadihosting.com/calisma2/files/uploads/kemepivutemexenibifeli.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/ed766783fcc08d7ca61e97f3bb7f25c9/9978500995.pdfIn PDF document text
    • http://tydafa.com/dafa/uploadfiles/20210903230037.pdfIn PDF document text
    • https://alhasooncorp.com/Files/files/43586674176.pdfIn PDF document text
    • https://sensiblemachines.com/ckfinder/core/connector/php/files/31219881673.pdfIn PDF document text
    • http://amongelite.com/ci/userfiles/files/jezilufekegefuk.pdfIn PDF document text
    • https://weyergans-hcc.lv/userfiles/file/gexupelozega.pdfIn PDF document text
    • http://labuchedeberce.fr/userfiles/file/nabovifepelobepur.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613809587495a---xesugumeluzanu.pdfIn PDF document text
    • https://laetitiabernard.fr/images/file/62460680236.pdfIn PDF document text
    • http://zl369.net/userfiles/file/robotufuli.pdfIn PDF document text
    • http://degeninhotel.ru/admin/ckfinder/userfiles/files/wezipotof.pdfIn PDF document text
    • https://naveenent.com/administrator/imagetemp/file/51460462786.pdfIn PDF document text
    • https://lyubomiradineva.com/files/file/zifosisowowanowi.pdfIn PDF document text
    • http://www.bash.cl/media/file/30358410028.pdfIn PDF document text
    • http://agriturismolionsfarm.it/userfiles/files/siforefiguzis.pdfIn PDF document text
    • https://mbzgogo.xyz/web/img/podborky/files/jafudakuwipotinomolokijo.pdfIn PDF document text
    • https://eastoncn.housemember.com/uploads/files/labajadewumududizexojidiw.pdfIn PDF document text
    • http://cmtdental.com/upload/ckimg/files/34418492101.pdfIn PDF document text
    • http://hkacca.com/userfiles/babupunapawopo.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614bbb4a124c0---28712998946.pdfIn PDF document text
    • http://knx-shop.ru/admin/ckfinder/userfiles/files/wewusigisavazekoz.pdfIn PDF document text
    • http://streathamtaxi.com/survey/userfiles/files/49154769414.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16132f1f071c72---53723845477.pdfIn PDF document text
    • https://www.ojchamber.com/ckfinder/userfiles/files/96377522217.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=play+store+could+not+sign+inPDF 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_off0000dc6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC6B 17072 bytes
SHA-256: ef6fc6ae4a2699635529a84d2a8eb0979763560a3d0c5336df64890216f8efe4
font_01_sfnt_off000108d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108D1 10760 bytes
SHA-256: ddb62390666bf5c34da97726df790a9f473ac1ce0831ab72e8761413ef00ec29
font_02_sfnt_off0001218f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1218F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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