Malicious PDF — malware analysis report

Static analysis result for SHA-256 82b7637882d3ad3d…

MALICIOUS

PDF

80.2 KB Created: 2021-06-15 17:32:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: e965c1e96d4a3cdb697ff99b94795e9a SHA-1: c88fab2d0b484dd2a0ff46ddf666f5e4da1e02b8 SHA-256: 82b7637882d3ad3db7215e908025894754622a8c2bd15dc51f30d4de5c6388f1
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the presence of embedded URLs and the overall structure point towards a malicious document, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://garglob.ru/uplcv?utm_term=mary+j+blige+everything+mp3 PDF link annotation
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/637aadfaffe3623612956bc1f1b2bc34/23443835672.pdfIn PDF document text
    • http://dvarenda.ru/upload/file/74475774646.pdfIn PDF document text
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/7f4746bb20d0f04decbfc920c1251eb8/22902620913.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/3up76slec61n22q5nf6f9rc1ci/dodapiwujupokugovokar.pdfIn PDF document text
    • http://elfuklid.cz/foto/Image/file/50926699856.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/6f5a8e5b535761c01ebbdb26f557a8f9/65974976801.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb736d8806---gewawelirewo.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/d4ac38d40bb4e3bcd89f9a9d0d72d7fa/negajoreriv.pdfIn PDF document text
    • https://barcelonacentremedic.cat/files/galeria/files/luwedoxufuse.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/64dd246b1a48050eeb2463f1222e9ecd/wukaf.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608925f76f8be---22972594457.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094643376fc7---bolimisejabivafuxel.pdfIn PDF document text
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/bd969ak57imup86sdam2vpvk7f/99234389493.pdfIn PDF document text
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/b3f338300470e47ebda4136d0aa6e703/polisorelawesujita.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c417ffcba66---jusajaretoki.pdfIn PDF document text
    • http://thegioidahoacuong.com/uploads/image/files/78888771045.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606f42b9322d7---wawuzozimuvesukoruroniza.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_off0000f902.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF902 5604 bytes
SHA-256: 966adee10dc2e756618634c98e26317f8954c5acb57cd50a7f743f33baf9c1fc
font_01_sfnt_off00010c08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C08 11648 bytes
SHA-256: db3bfa7c732214543e8b00fb5d73157a3783c2a22598c84833b7153450f2bfa6