Malicious PDF — malware analysis report

Static analysis result for SHA-256 8335c2bfb4a03ea6…

MALICIOUS

PDF

85.0 KB Created: 2021-09-20 12:31:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3663f7669b74b5834784c807c5ae2268 SHA-1: 7a6c745a3a134d3633497d40bba90dc8729917f3 SHA-256: 8335c2bfb4a03ea6a10df57b280b07f6fa5aeaeb984dbc7696417a2aa3a0e9c9
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs pointing to various domains, many of which are associated with link farms and compromised WordPress sites. The ML classifier strongly indicates maliciousness, and the heuristic firings suggest the document is designed to redirect users to potentially harmful content. No scripts were extracted, but the overall structure and URL distribution point towards a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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=polygons+that+tessellate PDF link annotation
    • http://wxmx.cn/upload/ckimg/files/202109051728159872.pdfIn PDF document text
    • http://jd6618.com/jd6618/file/2021-9/file/LwpCms2021_09_04_14_58_56_9187.pdfIn PDF document text
    • http://bogaarchitetti.it/userfiles/files/mabow.pdfIn PDF document text
    • http://fairbank-ia.org/admin/ckfinder/userfiles/files/xipajojawejeguvitig.pdfIn PDF document text
    • http://dongkoo.com/uploads/editor/files/moxafozotopibavurekowog.pdfIn PDF document text
    • http://z500.si/files/53776749894.pdfIn PDF document text
    • http://4reality.cz/userfiles/files/10782401354.pdfIn PDF document text
    • http://ls12368.com/userfiles/file/fujobagufeka.pdfIn PDF document text
    • http://kavernoklub.com/campannas/file/bemesujakigoga.pdfIn PDF document text
    • http://marketypik.pl/zdjecia/fck/file/33085060575.pdfIn PDF document text
    • http://minhtoangalaxyhotel.vn/app/webroot/files/ckfinder/files/wevuvupeb.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/161324811c8876---19834116642.pdfIn PDF document text
    • http://abnigakgdsg.friendship-match.com/upload/files/15416441893.pdfIn PDF document text
    • http://24hnbc.com/assets/ckfinder/core/connector/php/uploads/files/razewunefajamolakoriped.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613b590fb8691---91327507947.pdfIn PDF document text
    • https://evpersoneli.net/ev-personeli/file/nuker.pdfIn PDF document text
    • http://www.espaciocultivarte.com/ckfinder/userfiles/files/95920475625.pdfIn PDF document text
    • http://ersatzmonitor.de/userfiles/file/94026753413.pdfIn PDF document text
    • https://sibois.eu/userfiles/file/detasodebata.pdfIn PDF document text
    • https://www.rougeindigo.com/ckfinder/userfiles/files/84094809437.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/tmp/jisiw.pdfIn PDF document text
    • http://marchmont.ru/imgs/file/51148917024.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613825f03e55a---gelixe.pdfIn PDF document text
    • http://sushikyototogo.com/uploads/files/soxanupexuvofujuretejalej.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/16131e2bbbeecb---verizokolepuperige.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/f3fd099af73c03bb56658de7dbc62fbb/84320761558.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_off0000e67f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE67F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fe91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE91 18396 bytes
SHA-256: 890edf7cfbadf011c34f275041d4b41303a5db9604e68a0518c381ee1a06069c
font_02_sfnt_off00012eeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EEB 10308 bytes
SHA-256: 9367687f0990cf2b177a34887b57368a67cd07331cfcb4a5226acf1f6ba3f2c1

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