Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ced0f5f39aac4f5…

MALICIOUS

PDF

81.0 KB Created: 2021-09-16 05:52:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1aef4f10d4b408fce04ad60eb0c32a49 SHA-1: 03589ae8d175caa5b16368fc0dc424cb878a879e SHA-256: 0ced0f5f39aac4f5db973065282b97fb83c941687265184ef15e900fecc00c3e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous URLs, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics strongly suggests a malicious intent to distribute phishing content or malware. The ML classifier and ClamAV detection further support the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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.
  • 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://archism.ru/uplcv?utm_term=how+can+i+tell+what+version+of+android+i+have PDF link annotation
    • http://www.tivafa.hu/upload/file/62577560879.pdfIn PDF document text
    • https://cursosadistanciayonline.com/medios/files/vidivomonitikedaribekul.pdfIn PDF document text
    • http://mp-hd.de/data/aktualnosci_imgs/file/47736972413.pdfIn PDF document text
    • http://phongkhamthienhoa.vn/images/files/xijebepovowodikakakup.pdfIn PDF document text
    • http://puntolinea.org/userfiles/files/zobosuvizalit.pdfIn PDF document text
    • https://escaletravel.com/userfiles/files/gefidakugapubenunavomar.pdfIn PDF document text
    • http://rlponder.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zelijobim.pdfIn PDF document text
    • http://gatewayhotelbangkok.com/upfile_hotel/files/duxabuxofureruzevufe.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/1613a69f4837ce---23771058678.pdfIn PDF document text
    • http://polkovnik.su/upload/file/jaxaboratibonok.pdfIn PDF document text
    • https://aptitudeclass.com/ckfinder/userfiles/files/27416540543.pdfIn PDF document text
    • http://arredamenticucinesiciliane.it/userfiles/files/xuwotetaxazekasagut.pdfIn PDF document text
    • https://malashealthcare.com/userfiles/files/17073457640.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/62c057c3ae92c14a9b4d3a149f207bab/18804885501.pdfIn PDF document text
    • http://back2wood.de/userfiles/file/87007412907.pdfIn PDF document text
    • https://justbuymeds.net/userfiles/file/vapolojud.pdfIn PDF document text
    • http://lica.plovdivweek.com/js/ckfinder/userfiles/files/15961337880.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613067a2804ad---zopixaginida.pdfIn PDF document text
    • http://electriccityusa.com/images/fck_uploads/file/85519120490.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613c483cecde4---27048889843.pdfIn PDF document text
    • http://francescofesta.it/userfiles/files/fabavubovuvibezakurusofe.pdfIn PDF document text
    • http://meijialx.com/ckfinder/userfiles/files/lukabizamaje.pdfIn PDF document text
    • https://brianhigbielaw.com/UserFiles/file/2267399233.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_off0000d9ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f200.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF200 16824 bytes
SHA-256: 70a66f31ec252ec87186502bda1d019714dfa2952208d2e1077fda791b0c8a96
font_02_sfnt_off00011d7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D7F 10716 bytes
SHA-256: c99d47fdacbd6eba382b2de7e1ab31cfd3a3336801bee3a608903c0ce6e393a1

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