Malicious PDF — malware analysis report

Static analysis result for SHA-256 887ab11da8fe51ab…

MALICIOUS

PDF

71.3 KB Created: 2021-09-01 22:05:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e8d4cc2bc85aa073e73b585e6d2c8445 SHA-1: 763cf148009b6f4229f0f7d82770ee6aad588e3c SHA-256: 887ab11da8fe51abd787d6572e7ec1542f83fc3755f33ed3d583e915af2efaf2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and a large number of external links, many of which point to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing sites or download further malware. The presence of JavaScript suggests an attempt to execute malicious code within the user's browser.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://infrive.ru/uplcv?utm_term=cheap+manual+cars+for+sale+nz PDF link annotation
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608a722798385---29104345892.pdfIn PDF document text
    • http://georgefamilyreunion.org/clients/86186/File/gexawi.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c76e5198c8d---87591581959.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/ecb6f01ea988e328c8469f197149995a/zutaromuk.pdfIn PDF document text
    • http://dispensapertutti.com/userfiles/files/27495828182.pdfIn PDF document text
    • http://movitecnic.com/ressource/site-image/files/xodojod.pdfIn PDF document text
    • http://elazentrale.de/images/uploaded/file/6623613566.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/rutenamibineveser.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/23a32445a0ea9c99e24d85079c066aa2/29647961378.pdfIn PDF document text
    • http://maihome.hu/admin1/file/dotuxulezedug.pdfIn PDF document text
    • http://fornacedelia.it/userfiles/files/kugoxokegoj.pdfIn PDF document text
    • http://w3-japan.com/js/upload/files/28935245596.pdfIn PDF document text
    • https://ubranni.com/uploader/files/fuzavigakulip.pdfIn PDF document text
    • http://ilturismoinitalia.it/userfiles/files/lulez.pdfIn PDF document text
    • https://pemaboutiquehotel.com/assets/userfiles/files/24496620651.pdfIn PDF document text
    • http://titusrelay.com/clients/e/ef/ef304ccc03541e9e6382bef5f13b0a7d/File/55733847114.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160836a0bbf2c0---46229609526.pdfIn PDF document text
    • http://abwlargo.com/uploads/files/92595469260.pdfIn PDF document text
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/55ossusui05l0of1ploejjbg93/57889837961.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210730013250232.pdfIn PDF document text
    • http://ash-graphy.com/userfiles/file/65445224017.pdfIn PDF document text
    • http://applecentervn.com/uploads/image/files/12564834741.pdfIn PDF document text
    • https://jagamimpi.net/contents/files/32086589226.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_off0000b710.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB710 10744 bytes
SHA-256: 0699d3c3b1fea9e8c0571d2a9da60d76d320ce66758497ea52d17203d59c51c9
font_01_sfnt_off0000cf9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF9E 15724 bytes
SHA-256: 36973653e2ce01e00ac100fe8b8d63c58b7eeb99f51a73ba8d40881903721770
font_02_sfnt_off0000f78c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF78C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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