Malicious PDF — malware analysis report

Static analysis result for SHA-256 797e0dd7d78e34c9…

MALICIOUS

PDF

84.7 KB Created: 2021-09-01 19:28:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d0ab9cd8033c07f7c7a7cf55db03ea99 SHA-1: de1ce35e5e4f546a2ea1e951acf3a02b7ce9211b SHA-256: 797e0dd7d78e34c93f77519d09f7f06da389939cd08c1e5bf51decff486c161e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites acting as link farms. These farms redirect to other URLs, indicating a multi-stage redirection scheme likely designed to obscure the final malicious destination. The ML classifier and ClamAV detection strongly suggest malicious intent, consistent with phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://synerhu.ru/uplcv?utm_term=ff14+starting+class+guide PDF link annotation
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1609c1bdc4233f---bidaf.pdfIn PDF document text
    • http://naasschoolofmotoring.com/fckeditor/userfiles/file/gakizogoj.pdfIn PDF document text
    • http://logisticsnetworks.net/ckfinder/userfiles/files/jorakuguvawafawupomal.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/29e1ac90a48fae54113dcec802782bf9/linejokilesiwivus.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/78797680452.pdfIn PDF document text
    • http://dmscsmartlifeblog.com/userfiles/files/pexegizugap.pdfIn PDF document text
    • https://associazionedynamica.it/uploads/file/1614765867.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acf90e02794---ruzivokiwuxosojamiju.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161255d9a6f51b---68276553122.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d7f6ebd5cc8---tapifidenasefexuf.pdfIn PDF document text
    • https://cqc-material.com/app/webroot/userfiles/files/tulod.pdfIn PDF document text
    • https://yar-net.ru/userfiles/file/86662178640.pdfIn PDF document text
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/ccmj1v5ag1gurqu3be8vgmk4mr/rumaguredetel.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/978ad5ecb74c693c38a750f4c2fa6d52/56545010362.pdfIn PDF document text
    • https://tidurmalam.com/contents/files/7669739111.pdfIn PDF document text
    • http://siltherm.com/ckfinder/userfiles/files/85002141400.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16119387fbf05d---tivugilasakotapol.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16120c43d32f71---kigunepezevizedawufan.pdfIn PDF document text
    • http://www.gamylai.vn/uploads/files/dabupubafenufupub.pdfIn PDF document text
    • http://orthopediedelft.eu/files/92492852836.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608710c389820---50415179536.pdfIn PDF document text
    • http://tremonttemplemacon.com/clients/862779/File/neverazavogajoniwu.pdfIn PDF document text
    • http://n-production.com/upload/fckeditor/file/46095973727.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607b1b3242c45---72903246811.pdfIn PDF document text
    • http://xn--80aantfcaehjbxzf1m.xn--p1ai/userfiles/file/funilimojurunogareposi.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_off0000dc06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC06 10740 bytes
SHA-256: 53f0916215367c9955b5873ea6bb3e37c947bc146b68e2365512d739b1844e5f
font_01_sfnt_off0000f4a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010cbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CBB 21084 bytes
SHA-256: 027fe6a963b49c0a845e8c64d6d1f2c44972e433569c077da66c74e377e12c93

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