Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2e3804998af0999…

MALICIOUS

PDF

91.1 KB Created: 2021-06-25 23:03:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4d9676bacec2b0b0aecdf3e555764bde SHA-1: 81d980a994a56d8dbdd6d62e42745b61055d53f1 SHA-256: a2e3804998af0999233419bf2191de2d0f087fd8dc8eff49d592a1186a656b36
156 Risk Score

Malware Insights

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

The PDF contains a large number of links pointing to compromised websites, many of which host other PDF files. This structure suggests a link farm designed to distribute malicious content or lead users to phishing sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/kup477gl705b0nrevv06l6lrlu/xabetewapitutow.pdf
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/eh9rsc7gv69jqk23bod5ma9rvs/54433355677.pdf
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/a292a4e7a55ca08411d32bfca14deede/jurosumuwowiz.pdf
    • https://roeveragri.ac.in/wp-content/plugins/super-forms/uploads/php/files/80c5745754e7c197f85654947525555b/31106327839.pdf
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/03bc051c0e280e878582b55873b5e863/xisomepukidivekabub.pdf
    • https://ferado.vn/userfiles/file/weperuvumekalopegosazomex.pdf
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1609789af31e62---pukevatilubazat.pdf
    • https://ukdirectremovals.com/wp-content/plugins/super-forms/uploads/php/files/c38585311042ae4f417ce8ad2fc89895/duvenesanawebax.pdf
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16090f9ffd6d56---zosatabesetege.pdf
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075f7a3d486f.pdf
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c38cd8a65fc---32930845022.pdf
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/160757ee87808d---lorege.pdf
    • http://cn-junsheng.com/upload/file///2021528175811690.pdf
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609c5a4e2845d---93786356437.pdf
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/fe0ibh9fclg23lr8cedbgk4k12/pixavubabatubesi.pdf
    • http://airbaankhubon.com/userfiles/file/66589230679.pdf
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160813f5da4f24---xijarawoduvinabupijota.pdf
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/16090f508bb087---92173964156.pdf
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/be9889bb4d28ebf306286428008cf614/befibov.pdf
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b0b11116e2---89072759799.pdf
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/egr0maesv27nutr8q2l0bdn3cl/likibotesosodoxikul.pdf
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/cca7e137afa3117ce3bded10059d11ac/37539262212.pdf
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1608059331df9c---nipadunulefefe.pdf
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160cbbd4f3a60a---99243202747.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=tom+and+jerry+2021+4k
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00010921.bin
35ff0459ebbccabad1ae8f88eca7a274bdcaa67789579715cfb3763c59ddb421
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x10921 19916 bytes
font_00_sfnt_off0000d877.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD877 16792 bytes
font_01_sfnt_off0000f08e.bin
7ef84a5cd8727594cc960a4005cc679b772d3009423b71ee2eb4bba3fcac5fd4
pdf-font-stream PDF embedded font (sfnt) at offset 0xF08E 10676 bytes
font_03_sfnt_off00012a91.bin
c74104a6aba183e115d53de6d135477e6143fd11d337ba791f526de7b95a5a7c
pdf-font-stream PDF embedded font (sfnt) at offset 0x12A91 19768 bytes