Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ef0c1e2f0ef133a…

MALICIOUS

PDF

82.5 KB Created: 2021-09-20 01:47:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 69d6d010756a64163178c9c4c4b18afe SHA-1: 550fee331281c67af80a7163bf46aabf8c8d9932 SHA-256: 5ef0c1e2f0ef133a2fcb3d96d799209beebdf8b3f7dbcf4dad44b5ace7d1a157
96 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous external URLs, many hosted on compromised CMS platforms. The ML classifier strongly indicated maliciousness, and the presence of multiple links to potentially malicious or compromised sites suggests an attempt to redirect users to phishing or malware-hosting pages. No scripts were extracted, but the structure and URL patterns are indicative of a downloader or redirector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://stellar-toys.com/ckfinder/userfiles/files/pifomisugelanamawi.pdf In PDF document text
    • http://turinimoti.com/assets/userfiles/file/zitibixuboraxasovelapa.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/96342735783.pdfIn PDF document text
    • http://kaymccarthy.com/immagini/file/dovezib.pdfIn PDF document text
    • http://anneadamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/8372858217.pdfIn PDF document text
    • http://szakkepzosiklos.hu/upload/file/52183038473.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613231c6e4222---refadinimizutasajivorase.pdfIn PDF document text
    • https://clubsecurite.fr/webroot/upload/files/sadaminesemekusoninikug.pdfIn PDF document text
    • http://tnhmc.com/userfiles/file/88028352990.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/0cabaeda1f7ef7d36be9d921e2c74804/12596023038.pdfIn PDF document text
    • http://rotarytattoomachine.co/project-new/christianbook/upload_images/file/92347896713.pdfIn PDF document text
    • https://manorhair.com/uploads/files/202109131506059034.pdfIn PDF document text
    • http://car-zone.sk/data/data/file/71923748667.pdfIn PDF document text
    • http://dominopark.pl/public/upload/ckfinder/userfiles/files/kugam.pdfIn PDF document text
    • http://sunmoon-glory.com/web/upload/files/luzif.pdfIn PDF document text
    • https://conexusinternational.com/ckfinder/userfiles/file/marenodof.pdfIn PDF document text
    • https://otoform.com/upload/ckfinder/files/zegudipa.pdfIn PDF document text
    • https://ikitellirezistans.com/upload/files/97762774004.pdfIn PDF document text
    • http://wmc21.com/ckupload/files/jopigulofemi.pdfIn PDF document text
    • http://uniroll.pl/user_images/file/lufuzabemegamafijoduwad.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/zufofumomeromex.pdfIn PDF document text
    • http://asbufestival.com/uploads/FCK_files/file/14201114001.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/161451500985da---japoma.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=play+store+download+pc+windows+8.1PDF 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_off0000dcde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCDE 11036 bytes
SHA-256: 412f095ce9c313b2cf387ea3a4e2e56af8c41e3bb3c07bad6c9aa28980a4cf2d
font_01_sfnt_off0000f6d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6D0 17464 bytes
SHA-256: 1fc3a5fb4ac647167103ae46fde48026cf60c1368c2c41cdb6f4b1f679850165
font_02_sfnt_off0001240b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1240B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1