Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbcb7e879a8092e5…

MALICIOUS

PDF

112.5 KB Created: 2021-09-03 13:30:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 8d6020aa5c8d203000a72d1c45b67221 SHA-1: ba3412a1304c6a2d4f0bb56b36436321352cdc33 SHA-256: dbcb7e879a8092e5e8c8fbd5cdc6d65e9c1e5e696c8f6aae509377efaa8b8167
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was identified as malicious by ML classifiers and ClamAV, indicating it is a phishing or malware delivery attempt. It contains numerous external URIs and embedded links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. The PDF structure and embedded links are consistent with a spearphishing attachment used to lure victims to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://smidgel.ru/uplcv?utm_term=learning+pentaho+data+integration+8+ce+download+pdf PDF link annotation
    • http://www.anapharmata.hu/ckfinder/core/connector/php/files/vijozuvegixuvuzi.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/24r9ieljq4o4hmqjq44gkacro7/zamemu.pdfIn PDF document text
    • http://annassteen.com/ckfinder/userfiles/files/puneronikukotesan.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608a7c2c38190---92652479285.pdfIn PDF document text
    • https://justbuymeds.net/userfiles/file/fupugutox.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/f69e6528672ec2509a4a5574cfda56e1/6214874589.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/2dfbd37e24d6909bb0849cc9686d0897/levixowimajipejigobuwalox.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/40f1ba8da286f7e5a82326e5e4834e34/88944044883.pdfIn PDF document text
    • http://forma8.kz/ckfinder/userfiles/files/81511652559.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/8f9255212af23c2edf0efe0384860a3a/vodawetelaw.pdfIn PDF document text
    • https://poolpoint.be/uploads/file/87477785826.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160be6a8240275---41221158054.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d06d6962811---25685653486.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///38026900695.pdfIn PDF document text
    • https://synersys.fr/contenu/file/85314794450.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/ie07vme8vjct6vev34relg3k4m/84486637350.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/letexopesaribogilunupax.pdfIn PDF document text
    • http://knshzj.com/CKEdit/upload/files/81154510003.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/i7hnfkbml1755pbl06chmpuds5/90039363936.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/baxesokezumagiwakakefe.pdfIn PDF document text
    • http://cbestdesign.com/ckfinder/images_store/files/91353560125.pdfIn PDF document text
    • http://iwilldoit.ru/uploads/files/files/sawirolutegimoxugugajumi.pdfIn PDF document text
    • https://simplehome.ro/ckfinder/userfiles/files/tikalosawofasuxom.pdfIn PDF document text
    • http://ptaki.info/imgekoprojekty/files/xukovumula.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a106bcb4447---56489435113.pdfIn 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://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_off00014f31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F31 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00016743.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16743 19508 bytes
SHA-256: 60b399760c5ab1d43ba12217298a664f413f15accdd549ac2cfbffcacb1ea3aa
font_02_sfnt_off00019a44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19A44 10980 bytes
SHA-256: ae1d97e9b7561797f744d0c566bc1faca11f1ac6d5bcf8c69f4d5cac50c67e70

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