Malicious PDF — malware analysis report

Static analysis result for SHA-256 89e53be6054c9959…

MALICIOUS

PDF

86.1 KB Created: 2021-06-30 10:51:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: aa82564a79e242f810c7311bee384157 SHA-1: 7a219b7c52b72f3e90cce987e9963eeaeafddd57 SHA-256: 89e53be6054c9959810464e4f9d812367cad65aad23790868263a06e413309b8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs that point to potentially compromised WordPress sites and other domains. The primary purpose appears to be directing users to external resources, which is a common tactic for phishing or distributing further malware. No scripts were extracted, but the structure suggests it's designed to exploit user interaction with the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://cructi.ru/uplcv?utm_term=30+days+of+yoga+day+28
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c72be73909---51567910111.pdf
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609ab90230510---kunofejofuximo.pdf
    • https://nonbodepsg.com/uploads/files/17769612048.pdf
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/evdomq5n12qcjhumqoq27g0f29/poxenexotuza.pdf
    • https://iringmalaysia.com/ckfinder/userfiles/files/20534738584.pdf
    • https://sinhadventure.com/uploads/file/zuvufewefozakalejojuruje.pdf
    • http://dishandspoonproductions.com/ckfinder/userfiles/files/31594779377.pdf
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/umli1a6mkf0kgv42kgkqlne2e2/tagas.pdf
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160945a6e935e0---44072873167.pdf
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/cfcu4vgu0hl9b46kem8t4g9cnc/fixuvurag.pdf
    • https://iwnta.com/userfiles/file/wixifatafipowetela.pdf
    • https://nanosoft.mn/images/content/File/19295905483.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d92a06e1379---56853016747.pdf
    • http://thebellingerfamily.com/clients/0/05/05034faaa501c69409a7459485cba135/File/90511781813.pdf
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085642447352---79405116967.pdf
    • http://jrmhandling.nl/upload/file/4892952736.pdf
    • https://shellserva.nl/docs/Image/file/8035678226.pdf
    • http://interno-kazan.ru/upload/files/muletigiwigozorisotozeki.pdf
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606fa355ee0f6---86152719108.pdf
    • http://hkalc.com/userfiles/leroxunajibotutozalizu.pdf
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/2f0184e43d50d936e2010cc429e4ddc2/birodidatuxozogut.pdf
    • https://aquatrustfina.com/userfiles/file/pavakukewakaneramilivuva.pdf
    • https://michelbarbot.com/upload/files/28851796985.pdf
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/1608d96af10f96---turikejiziremanafagako.pdf
    • http://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/absl31deag6p3ntm6tqm4fre87/61010852536.pdf
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2b5ce1fb2d---tesanedemabenafobub.pdf
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bbbe9d5547---buginexagexixepusawosarar.pdf
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/e21c835b38d1a0dfed8f83cd0d032156/66971668286.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_off0000ef97.bin
7d96143ae275df2eb7e4467da331320fddab7ae6800c875ceb8ceea61cbe52b7
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF97 10596 bytes
font_01_sfnt_off000107bd.bin
ba77d731636b58e09b0c8389899dacfb5f18a59642b9fc9b7041e5f34dee7ee7
pdf-font-stream PDF embedded font (sfnt) at offset 0x107BD 16832 bytes
font_02_sfnt_off000132e7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x132E7 16792 bytes