Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f9259b5dd3eeb3b…

MALICIOUS

PDF

86.8 KB Created: 2021-09-13 02:11:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b90ade6a8646de614c5324262f5f799b SHA-1: 66285d22d2e38d819296e4e60dcad24533bb97b8 SHA-256: 2f9259b5dd3eeb3b2db2e1850179df37834160e8444f99b3311ae56eb8947ce8
176 Risk Score

Malware Insights

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

The PDF document contains numerous external links, with several pointing to other PDF files hosted on potentially compromised or disposable domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution through these linked documents. The presence of multiple compromised CMS upload links and link farms suggests a coordinated effort to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://martonaroniskola.net/userfiles/file/gipurufavesoxi.pdf In PDF document text
    • https://globalcircle.club/userfiles/file/13976033535.pdfIn PDF document text
    • https://cafesca.info/ckfinder/userfiles/files/pixovuvegit.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec63f8e635---jojamamepasasodurar.pdfIn PDF document text
    • https://eletmodguru.hu/files/files/76898699279.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16132798b9bc2b---40933343143.pdfIn PDF document text
    • https://mbzl-pro.xyz/web/img/podborky/files/37756477084.pdfIn PDF document text
    • https://www.bbmnetlicitacoes.com.br/cms/ckfinder/upload/files/kozevidisoxorovosapo.pdfIn PDF document text
    • http://margheritango.it/userfiles/file/solajilekagiluvemeki.pdfIn PDF document text
    • https://k31szmq42-nu28.com/contents/files/51217428537.pdfIn PDF document text
    • https://divanich96.ru/admin/ckfinder/userfiles/files/motukofomulukazosutuzoxup.pdfIn PDF document text
    • http://articolo17.it/siti/usr/foto/files/vulomudamimodipu.pdfIn PDF document text
    • http://sinoscaform.com/upload/ckimg/files/202109092131341240.pdfIn PDF document text
    • https://8cj2aja7-8mxb.com/contents/files/noxesinutumowi.pdfIn PDF document text
    • http://140.121.161.111/ckfinder/userfiles/files/65228100857.pdfPDF link annotation
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/lqg7jbv79ue8vhgaerslu2isp0/mazixup.pdfIn PDF document text
    • http://kenzoum.org/home/integrity/public_html/ckfinder/userfiles/files/42609164905.pdfIn PDF document text
    • http://resetimpianti.it/reset/public/file/65337523757.pdfIn PDF document text
    • http://snp-ent.com/files/fckeditor/file/1354295728613355ac7cce6.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/161347100811f4---temobelelakidebizegaja.pdfIn PDF document text
    • http://upsshop.ru/ckfinder/userfiles/files/raromewu.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/161356266a37a1---lazudomoxakerilu.pdfIn PDF document text
    • http://fongyoskert.hu/userfiles/files/xonomigejag.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=watch+friends+seasonPDF 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_off0000eedd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEDD 10520 bytes
SHA-256: 4b4c38b853672f0f637acc5a6330d8b89b5f57f0dd879a4143555bcde26028ed
font_01_sfnt_off000106d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106D3 17872 bytes
SHA-256: ae4df9ca16bf1f51e5aad57d1ef9ad8d1ab71c95f0e1bca111411f181c62f9bc
font_02_sfnt_off000135b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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