Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d94e90a776e1774…

MALICIOUS

PDF

71.7 KB Created: 2021-09-13 17:24:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 191981c2d2b26f320eeaed516bf832b4 SHA-1: 47e7fc725eefb11e10f55673bb48c268a0cf252f SHA-256: 8d94e90a776e177410e569ef3304b95db3d527f86a72f6556fc38a6a8ac2d143
96 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm for SEO manipulation or to distribute further malicious content. The ML classifier strongly indicated maliciousness, and the presence of multiple external URIs supports this assessment. No scripts were extracted, and the document body was unreadable.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://cructi.ru/uplcv?utm_term=jyotish+software+for+android+mobile PDF link annotation
    • http://newworldss.com/uploads/file/pajolumiziv.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613de6717e4d2---76596812306.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/8fa6dd14077ef1d8bc78875979f51409/69733585374.pdfIn PDF document text
    • https://zahidnawaz.com/UploadedImages/image/nokosivixaxofi.pdfIn PDF document text
    • http://sushiloverca.com/uploads/files/futuk.pdfIn PDF document text
    • http://bwemfjhjk.friend-match.com/upload/files/88845721035.pdfIn PDF document text
    • http://blankheich.de/images/uploads/file/reborebofivinekeremajazur.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/161300eb169b49---61107486760.pdfIn PDF document text
    • http://yuilchem.com/userData/board/file/21579071400.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613dc5786c9e4---botamuzoluzogupor.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131456f9904d---loguvor.pdfIn PDF document text
    • http://cungcapbaoduongcuanhatban.com/upload/files/77644571956.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133cf28a6418---gowunoneb.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/51352edad0b2951496c0294451b60279/33877667406.pdfIn PDF document text
    • http://manilag.com/FileData/ckfinder/files/20210905_D0A4923809625F9E.pdfIn PDF document text
    • https://liftsystems.ro/LiftFiles/file/49771923155.pdfIn PDF document text
    • http://spec-so.ru/sites/default/files/file/kurijikepozuzimokelup.pdfIn PDF document text
    • http://inistor.com/ufiles/files/91500654646.pdfIn PDF document text
    • http://hyunshin.net/userfiles/file/gizurafamalekabaxat.pdfIn PDF document text
    • http://blfimmobiliare.com/userfiles/files/73354564516.pdfIn PDF document text
    • http://nissanotogovap.vn/uploads/images/files/8888198489.pdfIn PDF document text
    • https://hearing-outlet.com/uploads/files/202109072123597768.pdfIn PDF document text
    • https://alsharqcc.com/userfiles/files/40118422588.pdfIn PDF document text
    • http://www.deopendeur.org/imgUser/file/15184588221.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_off0000b4af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4AF 16180 bytes
SHA-256: 601173ab6b63805d176a16da6c3866e2e8c5ada8a962e29b59bc50d2f6a97974
font_01_sfnt_off0000de2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE2A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f641.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF641 10948 bytes
SHA-256: 510eb866b1b0faabad3039ff9f3af55e5ddc171e3ab09f111fedd24ef5b379f1