Malicious PDF — malware analysis report

Static analysis result for SHA-256 59ea6e70a30f64d7…

MALICIOUS

PDF

77.6 KB Created: 2021-09-09 16:31:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9f352ea05cb9b4db8fe60a51ce74d08e SHA-1: c76fd1f59723f5d1a4721c368f1f09637ca3f214 SHA-256: 59ea6e70a30f64d7b8beec7a181369d759785fbedf3cf474bccfed93ca7bae11
96 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple domains, many of which are hosted on compromised CMS uploads or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of creating numerous links on different hosts, likely to improve search engine ranking for malicious content or to distribute malware. The presence of a 'utm_term_redirector' further suggests a phishing or malicious download lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://langfordfinancialservices.com/userfiles/files/99597580279.pdf In PDF document text
    • https://mahae.hu/files/files/puwazadejasoruxelufolirut.pdfIn PDF document text
    • https://gres-k.cat/userfiles/file/66989932675.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210906205149435.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612f5c7790f7b---gerusinuvupu.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/fb15f2f6ce149eb3db3ad6b68afd0564/11512871949.pdfIn PDF document text
    • http://lisaarkinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pubibutopufiko.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb730e7f33---59625650555.pdfIn PDF document text
    • http://dongsimkindergarten.com/upload/files/31358794305.pdfIn PDF document text
    • http://vuatoyen.com/uploads/userfiles/file/jizosu.pdfIn PDF document text
    • https://hsiaoying.com/userfiles/file/66592818247.pdfIn PDF document text
    • http://veterina-hrib.cz/user-uploads/files/60817886052.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/202191820168520.pdfIn PDF document text
    • http://letnipohar.cz/upload/file/newopadabinafi.pdfIn PDF document text
    • http://philipsphotographystudio.com/rabutir.pdfIn PDF document text
    • http://ventensis.lt/public/ckfinder/userfiles/files/3927879983.pdfIn PDF document text
    • http://ssp.by/var/upload/sijumikadole.pdfIn PDF document text
    • https://clinicaabrahaoosta.com.br/ckfinder/userfiles/files/debusakevifabod.pdfIn PDF document text
    • http://lezeckastenakosice.sk/upload/files/jegetilovag.pdfIn PDF document text
    • https://fwstc.in/userfiles/file/33203732981.pdfIn PDF document text
    • http://epmachine.ru/d/files/63177116072.pdfIn PDF document text
    • https://sinarlangit1.com/contents/files/kinogew.pdfIn PDF document text
    • https://tese.in/ckfinder/userfiles/files/jilanolirugiz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=download+masala+express+mod+apkPDF 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_off0000c81f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC81F 10644 bytes
SHA-256: 96ba88c15021de4fa3c3292a16675969b6cb096c38f0a8f78d6d71e91c7d8fb7
font_01_sfnt_off0000e08a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE08A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f89c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF89C 18828 bytes
SHA-256: 6f5984db334aaaa64e9d97410ec0e9f247ea8318fba421cf574507443c8ff5e6