Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab4d7377da37096d…

MALICIOUS

PDF

115.2 KB Created: 2021-07-01 00:38:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: a01c61ef7260fa713516143da87e2e31 SHA-1: f9dc3dbbab3c5112749b60d5c651eeb6d03208de SHA-256: ab4d7377da37096d667f8179e2121bc065d896a3f6c3ffae67a807cfa2e6b223
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress sites, likely intended to host malicious payloads. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics, along with numerous extracted URLs, strongly suggests a phishing or malware distribution scheme. The ML classifier and ClamAV detection further confirm its malicious nature, likely as a downloader for a second-stage exploit or malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9819

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 https://oniceh.ru/uplcv?utm_term=cecil+spectrophotometer+manual+pdf PDF link annotation
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160950c64a25fd---podunin.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080546b9a3c8---78771355055.pdfIn PDF document text
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088971033c2a---61012456269.pdfIn PDF document text
    • https://amatnieks.lv/pictures/image/xovurowasokipi.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/cb7949c329bbca4f0922da6942dc1330/kopupifaja.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/7a468992e4084a7b16a9313367977dce/14088561922.pdfIn PDF document text
    • http://proxima-design.cz/files/file/44887860164.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/740f01a09b727d86aec45fb0d198bc10/46398920262.pdfIn PDF document text
    • https://francoisdaulte.com/ckfinder/userfiles/files/77874450534.pdfIn PDF document text
    • http://splogservice.ru/content/file/dazunuruvivevaka.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607baee476de9---kefaxaxenogiw.pdfIn PDF document text
    • http://agnieszkapawlik.com/userfiles/file/55087307082.pdfIn PDF document text
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609702989e34f---piviwoguvifejoxariwidolu.pdfIn PDF document text
    • https://loctra.net/userfiles/file/55080626507.pdfIn PDF document text
    • http://jnafarms.com/clients/864068/File/69069504745.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2960c1df97---97803235872.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/kitidutasesame.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/802fdc5d3e077b0c660b739636dfe312/lerusopodolovinuzupoda.pdfIn PDF document text
    • https://kp-bs.ru/upload/files/wodurabutiletirivebelebo.pdfIn PDF document text
    • https://aprilboya.com/userfiles/file/53593300320.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/1607798656a82b---4752181878.pdfIn PDF document text
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607013c63c479---vovigezimobukuzen.pdfIn PDF document text
    • https://archltginc.com/wp-content/plugins/super-forms/uploads/php/files/68c4998d54e3c13a5db296dc5314a9af/96035788054.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/160a723ac77390---nimapodegaziwum.pdfIn PDF document text
    • http://pizzeria-millemiglia.de/app/webroot/img/editor/file/57507338618.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607996a272720---15773394967.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_off000158e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x158E7 11016 bytes
SHA-256: 7ea63e7a9bd548923cb27387e5acd8223e1ac4fef08f75c812b7a6ec5e7802f1
font_01_sfnt_off0001724d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1724D 19280 bytes
SHA-256: 994f98f009350ecc72420c6e18de84ec2370e89e932bf8250d86e323a2e0f89e
font_02_sfnt_off0001a553.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A553 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.