Malicious PDF — malware analysis report

Static analysis result for SHA-256 aca536e203cdbc71…

MALICIOUS

PDF

78.2 KB Created: 2021-09-07 11:11:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: d5cc5ae0fede10722138231d85a79a35 SHA-1: 06d4602f819376e1827c6f8f20cc1f484aa40362 SHA-256: aca536e203cdbc7109785afb5ad0ec55d797e2db44fc9dc525bca655495c4bac
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by an ML classifier. It functions as a link farm, containing numerous URLs that point to other PDF files hosted on various websites, some of which appear to be compromised CMS uploads. The presence of multiple distinct hosts and the use of UTM parameters suggest an attempt at SEO manipulation or distributing further malicious content. No scripts were extracted, and the document body was unreadable.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 5

  • 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://wastran.ru/uplcv?utm_term=shikwa+jawab+e+shikwa+allama+iqbal+urdu+pdf PDF link annotation
    • http://guowangcable.com/d/files/pamegevanawine.pdfIn PDF document text
    • http://tortsurprise.ru/upload/redactor/files/41212531858.pdfIn PDF document text
    • http://chiari-web.com/ckfinder/optimist/files/makugigodaxonarik.pdfIn PDF document text
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/6ac31b3a1d985081f058bd24abe26b14/lusuvarisipexoruzepama.pdfIn PDF document text
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160bf878c674ce---pibok.pdfIn PDF document text
    • https://www.alphaveneers.com/wp-content/plugins/super-forms/uploads/php/files/b9e6192c5341c3325cc6a7a3d8314a60/zotujonisav.pdfIn PDF document text
    • http://maybomnuocdanang.com/uploads/image/files/61965122457.pdfIn PDF document text
    • http://chonburi33.com/userfiles/file/66918672790.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/083620b125acb67c2b73840adff7c0bc/8689890568.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074148d78547---50979229259.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd94cb3701---37867155129.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/c6tihat37pltiu5o673qq0pr58/43271864779.pdfIn PDF document text
    • http://cisseo.net/userfiles/files/79033903847.pdfIn PDF document text
    • http://cbgnfinance.com/userfiles/file/24782062375.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/kuzatewozezituri.pdfIn PDF document text
    • https://www.tanyadantus.com/wp-content/plugins/super-forms/uploads/php/files/3539c3815ea510d873b2eec89b165396/23396240008.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16126dac177b89---11446673223.pdfIn PDF document text
    • https://nolimitscenter.be/peausitive/images/FCKeditor/file/gejewekokexegivori.pdfIn PDF document text
    • http://www.bash.cl/media/file/luragokaluroforazopezone.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1610ef4e7d5bf5---jijusavevibiriwagikinido.pdfIn PDF document text
    • https://xigmatek.com/upload/files/55573683812.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afbfd7a4e5e---kalijoginaxozonagafoj.pdfIn PDF document text
    • http://foreverymuslim.net/home1/forevev3/public_html/foreverymuslim/upload/file/47128169460.pdfIn PDF document text
    • https://by-express.com/upfiles/editor/files/detabavabavo.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_off0000cb34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB34 11212 bytes
SHA-256: 15ac05f07cf0674b580728547881a5fd51521625c15496bba3fd21d20027df37
font_01_sfnt_off0000e4fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fd0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD0E 17684 bytes
SHA-256: f4da01bbebcbc54fb34e54c0e5ab1ba70b46655be4cf6863c24180da59e13272

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