Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd889753722378dc…

MALICIOUS

PDF

81.7 KB Created: 2021-09-16 18:13:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8eae83fe6b46aecf3573cc78bc7d0bca SHA-1: d73bd491fcfe8d61599cba5954fe95e6091a7654 SHA-256: dd889753722378dcd1fe2d6a02d68cde5c057ccd7902f34466caf67fbbfedcfc
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The presence of JavaScript indicates an attempt to execute code within the PDF viewer, likely to facilitate further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://cructi.ru/uplcv?utm_term=crash+team+racing+nitro+fueled+download+android PDF link annotation
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16142fb055e477---97332999680.pdfIn PDF document text
    • https://mmtours.si/uploads/48677696911.pdfIn PDF document text
    • http://tantos.jp/js/upload/files/98545867260.pdfIn PDF document text
    • https://www.lire-les-notes.com/ckfinder/userfiles/files/jojubujujunudimozakebezal.pdfIn PDF document text
    • http://snft.ro/media/file/dagatugororewuv.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613021d11e2cb---97706735989.pdfIn PDF document text
    • http://biolabsrl.org/userfiles/files/34682998113.pdfIn PDF document text
    • https://luatsuavina.com/userfiles/file/turujitekodo.pdfIn PDF document text
    • https://roofmed.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613dad51cbfb2---kinetukogi.pdfIn PDF document text
    • http://jenan.com/ckfinder/userfiles/files/zofoz.pdfIn PDF document text
    • http://cobe-ing.it/userfiles/files/navuju.pdfIn PDF document text
    • http://tuyothuyluc.vn/webroot/img/files/7396338476.pdfIn PDF document text
    • https://esprimagroup.com/userfiles/file/79705233335.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c624a3f1f3---pedujurisisatasawepiwuka.pdfIn PDF document text
    • http://safedoorsystems.com/cmsimages/file/xikixumeros.pdfIn PDF document text
    • http://balletpanov.com/uploads/files/gezagokunabi.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/dd4506a7f3e05061d7e91daa6a53d739/53221583817.pdfIn PDF document text
    • http://xn----7sbakn3aoflleitf3m6a.xn--p1ai/userfiles/file/kuwufufasevoz.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613f609d1514d---46672309589.pdfIn PDF document text
    • http://rajskiewakacje.pl/userfiles/file/juwexeluvebumupudufolili.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/161344ee449d8e---sakejotaredatene.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/17f7efbd0be83f3f7afa2595a46f2b53/8675776656.pdfIn PDF document text
    • https://systematix.pl/userfiles/file/17012972038.pdfIn PDF document text
    • http://danchrisjewelry.com/userfiles/file/49201491750.pdfIn PDF document text
    • http://newshop.jp/archive/file/ralokaxawik.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_off0000d59d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD59D 11140 bytes
SHA-256: 0176505de21cba860c9768a6f5e79ba016b65146628fc9bfc19bdb9d3df4d4e5
font_01_sfnt_off0000ef53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF53 18728 bytes
SHA-256: 929c35242f66374efb17761edca28b1563daa790474ae0f872096378291d923e
font_02_sfnt_off0001204a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1204A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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