Malicious PDF — malware analysis report

Static analysis result for SHA-256 19376b9397160836…

MALICIOUS

PDF

85.5 KB Created: 2021-08-21 13:09:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 9cfa568b6f5091c2ef450a412ed3469c SHA-1: 8dba21deb295e8dd1f55be61c6776bf7739a6878 SHA-256: 19376b9397160836a5ea7375873cb4a780f783d5157ea5f471c7c5f5f4cc0437
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 pointing to compromised websites, specifically utilizing CMS upload directories. The presence of multiple links on disposable hosting and the use of UTM parameters suggest an attempt to manipulate search engine rankings or distribute malicious content. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 http://fonnepal.org/userfiles/file/27241536004.pdf In PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/e5795fb79f76fccb7a25297ce952170d/desetufigijusasan.pdfIn PDF document text
    • https://akconta.com/uploads/files/dimuwiwufezeji.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160738ecdd90b4---66387382994.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/f1a8357aeabeb9d3e12d6e681d7a35d7/60866848209.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/593e6659d4e45286b2de855050a66454/fenidarasimikoseborutas.pdfIn PDF document text
    • http://stressmanagement-karriere.de/userfiles/file/79963878729.pdfIn PDF document text
    • http://huucodatlanh.com/userfiles/file/nelozonu.pdfIn PDF document text
    • http://ulsantour.com/FileData/ckfinder/files/20210704_03445BC6D51B1AA3.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160949d5f39a19---vitewemuxi.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/i5o59bj795hgdtd2lesr62vqt9/84698617242.pdfIn PDF document text
    • http://mnogonomerov.ru/uploads/file/99763309565.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1609ebf3987a35---35416738465.pdfIn PDF document text
    • https://balajitutorial.com/admin/userfiles/file/kumovirumazek.pdfIn PDF document text
    • http://clinicaveterinariasangiacomo.it/userfiles/files/23596811682.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160d96055ac728---retamuvibirefoz.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1daebb2ef6---riweleni.pdfIn PDF document text
    • http://firegallery.ru/img/upload/texojesibowaripuzanikexe.pdfIn PDF document text
    • https://floridahouselottery.com/test/userfiles/file/88470471007.pdfIn PDF document text
    • http://shuswapladystriders.ca/userfiles/file/juwajupizawiputab.pdfIn PDF document text
    • http://branpc.in/ckfinder/userfiles/files/dinupodibidemusupevi.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/hvp5j4phcmuckge2kh3nqipv22/zugapilikinupotuman.pdfIn PDF document text
    • http://xn--2vxr09c6mc.tw/CKEdit/upload/files/mivulikagejesupatipesuwu.pdfIn PDF document text
    • https://bfull.ru/uploads/files/renijetikogof.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=countable+and+uncountable+nouns+worksheet+with+answers+pdfPDF link annotation
    • 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_off0000e5ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5CE 11164 bytes
SHA-256: 8db9e3285af1736a6e634bf2347efbc4d0d99f747b6dcd662abca50ee674d0ee
font_01_sfnt_off0000ffbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFBC 17452 bytes
SHA-256: 9c5febeff5fbe9dbafa7ab41160ab66e0e4fbfc7eed2670afe08b0659c38bc64
font_02_sfnt_off00012d51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D51 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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