Malicious PDF — malware analysis report

Static analysis result for SHA-256 77586f5afd3f5cf3…

MALICIOUS

PDF

87.6 KB Created: 2021-07-14 02:02:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 91186013c3daf6680be9aee967d6dc64 SHA-1: 3c10eda7c14e8fdd7c3b41a92baedbc730df2561 SHA-256: 77586f5afd3f5cf3b0b65e889e74053abedf9ff502dfb243ef35c3d893e95c33
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to disposable hosting and compromised CMS upload directories, indicative of a link farm designed to obscure malicious destinations. The 'SE_PAYMENT_REDIRECT_LURE' heuristic strongly suggests the document's content is a pretext to trick users into providing financial details or approving fraudulent transactions. No scripts were extracted, but the overall structure and heuristics point to a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • 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://kingalbertltd.com/uploadedfiles/file/88880683029.pdf In PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160da4b348e8a5---52982910398.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa8bc6ac0c---82283254163.pdfIn PDF document text
    • https://auditorescr.com/ckfinder/userfiles/files/kidexabatixarubav.pdfIn PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/5a6a118cd4e81c076fb30bf3fdd5f97a/jawalimiruroruwobixukoge.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/b5177a5856c27e0aed820241680f4221/datagasadugolekodiwolurer.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a85e98e1901---zofopowadamov.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/ud5eungn5m04li95hr4trfqg3h/bipapizusedidozitir.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608332f36f864---57721725856.pdfIn PDF document text
    • https://chp-travel.ir/data/file/34846970036.pdfIn PDF document text
    • http://pkynfe.net/userfiles/file/93767604279.pdfIn PDF document text
    • https://cambodiaangkorhomestay.com/userfiles/file/52374408351.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c64a9c5730d---wazawimoza.pdfIn PDF document text
    • http://scuolascifondocortinadolomiti.it/userfiles/files/38580189365.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/59dedf62059d2e3f6145d59f3dccb79f/79474595241.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ae7dcb7560---55684167882.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/a6cb3716b45ff01dc2fdf18d135aea12/19939301629.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/c4a8c9a609449ed8d4cdf48320a0debb/95730879218.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/2f3c0427ba8e9ee7faea2a16d808730b/44479667361.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/7bdb6a537bd2a3f9f875fdecd08d6f04/61160276559.pdfIn PDF document text
    • https://www.movingwithmagna.com/wp-content/plugins/super-forms/uploads/php/files/49e327aab877dde4c8fb27ca76ce8e5b/kosidewonaso.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/xakixawuw.pdfIn PDF document text
    • http://ranjitabiswas.com/userfiles/files/vuwizekesufopedowolugo.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/ad753c725074ee30bfedd2f8514cea3e/85384082775.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160e7b65a50ae3---89868758316.pdfIn PDF document text
    • http://straub-online.ch/userfiles/files/48601431680.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=check+my+licence+numberPDF link annotation
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/546e4c1c12651c65d0792614a835ecd3/gurafowakiguxadiziwez.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_off0000f626.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF626 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010e3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E3D 10424 bytes
SHA-256: 0db29a26841db949a67d4f6395fb2c46efb379ee737019117e5d6951bd5cd41d
font_02_sfnt_off00012590.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12590 16712 bytes
SHA-256: d1de132969f03d17a7fb79044f7043d14d4a43757fdbb0d845cececf627ce953

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