Malicious PDF — malware analysis report

Static analysis result for SHA-256 eabf029e62d6a9e9…

MALICIOUS

PDF

74.6 KB Created: 2021-06-11 17:53:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: da861fc7fdfd71911b55bf4148594719 SHA-1: cad39a80f95419fdc8d28c7815dfa179ed131dc6 SHA-256: eabf029e62d6a9e9a1caa5de51f2faa527fb78f16273edead21bc95022a77d89
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 0.9999

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://oniceh.ru/uplcv?utm_term=aptitude+by+rs+agarwal+pdf PDF link annotation
    • http://adria-ex.com/images/blog//file/72640366618.pdfIn PDF document text
    • https://ltanimalpark.com/wp-content/plugins/super-forms/uploads/php/files/73161084a3c29e67be5773841134cf6e/70278204489.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609425d275d51---sukotimiwinufefoparujilof.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/e7dda1e3a5dc9b35d116dbdecd743869/93174402400.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/a7f63ae2c0a203c6fd2b27cee1c2b933/22132641132.pdfIn PDF document text
    • https://www.visitrwanda.com/wp-content/plugins/super-forms/uploads/php/files/4f1c73216dbc720f154988b8aee96031/sibudunejasisano.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/cf97b8b397c9352232ea9293f57a97f2/63163849401.pdfIn PDF document text
    • https://sonntag-immobilien.lu/userfiles/files/doperuja.pdfIn PDF document text
    • https://bamfieldrental.com/userfiles/file/lilanozedolaxot.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/4tb5ddr585rbpj42glrgb7buue/jujewapoxavafa.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160844ce07e5df---bawaduv.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/61439c8ebe7613f08d1dd88177c7903a/73091883579.pdfIn PDF document text
    • https://burlingame.com/wysiwygfiles/file/pogoda.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/f3ca0dc8cf305be43955d2c0cd0f8c2b/zavemububop.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/60ea0491d23f54d2c4848da24dce2fd8/8762251992.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/voxevusevekopijivinijapub.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_off0000e35a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE35A 5532 bytes
SHA-256: 65167b80120d3868d36d9b912cfa5bff6d9337cbd734044275ff1ab9b3645dbc
font_01_sfnt_off0000f655.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF655 11236 bytes
SHA-256: af95cc4fff435519f4e4bf5b1a3286e07666ed20daed592a42c9b5720aceb595