Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff660d3f556b370d…

MALICIOUS

PDF

86.3 KB Created: 2021-06-26 06:20:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2c73ebf989c891304c3d1224e7b7d48c SHA-1: b6abf01fab13cb373d554d2b08e9203643d6f10c SHA-256: ff660d3f556b370d35af4dcf7d3aa037db0217e6cab68a23be70bd436b565275
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV. It contains a link farm pointing to numerous distinct hosts, many of which appear to be compromised WordPress upload directories or disposable hosting. The primary purpose seems to be to lure users into clicking these links, likely leading to phishing pages or further malware downloads. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://logisticsnetworks.net/ckfinder/userfiles/files/ragibasiwoxerufagimowug.pdf
    • https://otelnamore.com/wp-content/plugins/super-forms/uploads/php/files/a76851edb6072a6b5f7b8eba71ee3ee6/nemesakofiwuruseripupu.pdf
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b65d6eee8ff---kinezanedonikuluritisujew.pdf
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/1ts0cmgo7tjk2lclmlcpucq6jv/46428355248.pdf
    • http://rbtyutj01.com/userfiles/files/1351721148.pdf
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/1ce190dc28c6bf976b549286265f9f96/67888689280.pdf
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/eckf4e0jj0j63uvfcih6478ldp/99539476713.pdf
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160d6604d0256a---72546566699.pdf
    • https://www.webplease.it/wp-content/plugins/super-forms/uploads/php/files/cm40fqkqm7ebut5mkkdc7i5v1c/zidukarifaxavulifot.pdf
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/fb645d948eeb59a4bc23c649b15e5904/64461594595.pdf
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/06de55520beaeb831fb36159b3acc6e5/jaxisunilomiv.pdf
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1b428f4d2---bumesoson.pdf
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/1607a40f993b44---78742828778.pdf
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/16098806247d50---49671796881.pdf
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/fd5ff08975648e886ae9257e5a3492c3/32229288526.pdf
    • http://maslatalaia.com/userfiles/file/jijudelenosojokizipunuleg.pdf
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/160909ad8c72df---xuloma.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160b756ad3549e---dijajegusazoje.pdf
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1607b98f93fee1---tikojexovokolamifugoxaj.pdf
    • http://c2r-auto.com/uploadfiles/file/2021052605142273499.pdf
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bab647a7071---rutuporus.pdf
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/tap1s8mvb6enqpog1rm5bq00m8/pepepewerekituk.pdf
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/363602c47cb99d28d30ecd318a17246a/9598255134.pdf
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608256dd80b35---kadonajopepa.pdf
    • https://etre-cheval.fr/Applications/MAMP/htdocs/etre%20cheval/news_pix/file/97038287613.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=typographic+design+form+and+communication+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec23.bin
023f9a8ec9c6d5660d75a7e1ac2c870f31222e006cb03fd3230444dfe664d81d
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC23 11200 bytes
font_01_sfnt_off00010608.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10608 16792 bytes
font_02_sfnt_off00011e1a.bin
73680dceb41a524eed4a2bec350a651bb04ee3c1e417a01d76ad2a4589f39637
pdf-font-stream PDF embedded font (sfnt) at offset 0x11E1A 17728 bytes