Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bac3dbe6b261df7…

MALICIOUS

PDF

68.4 KB Created: 2021-06-09 08:43:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 2ae1a0b0ef11e6a8fdfb2adfaf2d9d34 SHA-1: a63a14bbf3aeeabe3ecf6a4d9270f32bf85e1550 SHA-256: 0bac3dbe6b261df7212479e43ea1d7089af717c659049e97e15325eb9fb5e0a4
164 Risk Score

Malware Insights

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

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 and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://archism.ru/uplcv?utm_term=jenda+pai+kapiraju+full+movie+telugu+download PDF link annotation
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072473719ee8---75843667002.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/3cc6adb241eb51e73c2e95c2a7398fd9/winokinegolufikujajoxa.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cdc67ae681---jikapamajefoxosa.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/21733254357.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ea5816bf84---53675364321.pdfIn PDF document text
    • https://geneticapanama.com/userfiles/file/benuxodetevofaminawif.pdfIn PDF document text
    • http://nakajima-ya.com/upload/save_image/files/36177125003.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090ef6048c2f---88310479750.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/a4827d1a3f60b839fdf72a0470ca279b/17599200398.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/3bd9rfj8nmm7n6ne80d9929nlu/mazozo.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/zowuzuwikunujenuxikurim.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/hgjv6v5q35fvrjlqh4egafl6u3/95440905329.pdfIn PDF document text
    • https://hometeamcorp.com/images/usr/zidugedezuvanuvu.pdfIn PDF document text
    • https://tolgyesvolgy.hu/userfiles/file/detexafumimozoxoxokuw.pdfIn PDF document text
    • http://artospace.com/pics/file/gokoburezoso.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF68 5464 bytes
SHA-256: 5b25954553a5ca489aa057dd831908d62b6e433ac8681f30e4eae3e5cef6e918
font_01_sfnt_off0000e20a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE20A 10300 bytes
SHA-256: 85bd5061603dad4fd94ca6de335928f36cce6db1b8c2a499e6d4f49e8641f2c2