Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d25c4c9b0eb4edd…

MALICIOUS

PDF

94.4 KB Created: 2021-09-17 08:30:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b53ffe25cac65ba6bb859e59e0cb026c SHA-1: 88d85396600fbed4e906b6492c36b2a23f86f74f SHA-256: 2d25c4c9b0eb4edd7ccb7dee5d0fd5a5814172cc9392621c8b64bea9208ac058
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or are hosted on disposable domains, suggesting a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports the attack pattern of luring users to external sites. No scripts were extracted, but the overall structure and URL analysis point to a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://wastran.ru/uplcv?utm_term=free+robux+in+3+minutes PDF link annotation
    • http://globalfeedindustry.com/upload/files/89666450735.pdfIn PDF document text
    • http://badaranquehablar.com/userfiles/files/buxumuvagomapejemuvugato.pdfIn PDF document text
    • http://hoteldanang.com/uploads/images/files/kapasavunomizobovijupipax.pdfIn PDF document text
    • http://hodoan.net/userfiles/file/kaxurelukabebalo.pdfIn PDF document text
    • http://babywagen24.de/userfiles/file/gefibimavomupujig.pdfIn PDF document text
    • https://zlataraburmevuckovic.com/files/94623692325.pdfIn PDF document text
    • https://bepxuyenviet.com/upload/files/todutirimosupumu.pdfIn PDF document text
    • http://www.atccs3.it/atccs3/fckeditor/editor/ckfinder/userfiles/files/zedawudarosewuf.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16131bd531d323---94664952142.pdfIn PDF document text
    • http://rayer.cn/d/files/kudexonuvasi.pdfIn PDF document text
    • http://nrgmedia.hu/files/file/23698370137.pdfIn PDF document text
    • http://onfireinteriors.com/userfiles/59893093558.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/efeda3bfea1de1b38c80b3f2ce5a38f4/repegogi.pdfIn PDF document text
    • http://antitumor.org/filespath/files/20210916074928.pdfIn PDF document text
    • https://majubesar.info/contents/files/tanenivenarovudobejig.pdfIn PDF document text
    • http://inwama4.vn/webroot/img/files/78962362361.pdfIn PDF document text
    • http://globomax.eu/userfiles/file/74504711320.pdfIn PDF document text
    • https://ventadeterrenosurbanos.com/userfiles/file/mavogu.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/lmis6kqkns0eujt1m7q98ujpii/jolupuworakofogilixir.pdfIn PDF document text
    • https://guanlai.tw/uploads/files/202109151128367449.pdfIn PDF document text
    • https://stormester.no/files/file/6222120002.pdfIn PDF document text
    • http://cichanski.com/Upload/file/mugetawanagakemadiso.pdfIn PDF document text
    • http://pallenberg-busreisen.de/uploads/files/49247515950.pdfIn PDF document text
    • http://innobiztour.com/FileData/ckfinder/files/20210908_48DA5B44D6F27B08.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_off000107f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012007.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12007 10552 bytes
SHA-256: 0ecc1a996f84a1f5ff34ab4e5b1ecf80b31c7acf3720b9a940e472bf1e261978
font_02_sfnt_off0001381f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1381F 19724 bytes
SHA-256: 2be7c57ec7fe7f90f499ad4a1a8df277151df955a92e9a7618958478b523b3b7

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