Malicious PDF — malware analysis report

Static analysis result for SHA-256 427726532f29d63a…

MALICIOUS

PDF

85.6 KB Created: 2021-07-18 00:26:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5245ad56078fcf84b84a38ef04878213 SHA-1: e7c3ef507445e04b67c08afaf0a5b42c5f516dad SHA-256: 427726532f29d63ad2fd0ccdc939263922dfc21b206182c8d12c5ed24edd7c8b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to multiple external URLs, many hosted on compromised WordPress sites, suggesting an attempt to distribute phishing content or further malware. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/cfafb05331a8515a1fd17b9eb3bdf74a/72240101269.pdf
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608be62034d7c---fevetodibaketa.pdf
    • http://bean2beenefamilytree.com/clients/60578/File/22462881964.pdf
    • http://hotspot-usa.com/js/upload/files/65052277165.pdf
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/6095ef0ebac2a91feb0742d6eab75d41/kasumufevuborelogaromiwip.pdf
    • http://sklepjola.pl/userfiles/file/11249811596.pdf
    • https://www.ideaklinik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ef6f146e31---52861830523.pdf
    • https://stauber.lt/images/files/91325867080.pdf
    • http://inwallendorf.de/userfiles/file/62455669394.pdf
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/09a518fcff42204cefe1536f38670bdf/48352415176.pdf
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/9c2pjii33g3khmjmv4lku049bt/lixidosinosugiveni.pdf
    • http://vitali-schulz-eiskunstlaufen.de/userfiles/files/kamaxul.pdf
    • http://ressourcengarten.de/azubi/userfiles/files/90601229243.pdf
    • https://condicionamentofisico.com/arquivos/file/nujitetelofuteperasomek.pdf
    • http://debschoen.com/userfiles/file/rodazajejevikubomigifos.pdf
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e35c381e68---11472216635.pdf
    • https://samowar.ch/upload/file/91358566190.pdf
    • http://yuha.be/_files/file/5235792799.pdf
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/0bb476c1bf71073a04bfb91aeca7a87f/wawogumofuposa.pdf
    • http://thestarbusan.net/FileData/ckfinder/files/20210627_D3878B06FE8055A9.pdf
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160ed039bc89a1---26906466510.pdf
    • http://sns.hu/_user/file/61227591918.pdf
    • http://pneusmarene.it/images/file/20308931468.pdf
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160976e0d1e48c---notipesuvibemakobe.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=types+of+tower+foundation
    • 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_off0000eaed.bin
25af8a3078a85617e6244934aa502e8b09bb809661a3d0660db30dad89f79bad
pdf-font-stream PDF embedded font (sfnt) at offset 0xEAED 17368 bytes
font_01_sfnt_off0001184d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1184D 16792 bytes
font_02_sfnt_off00013064.bin
37f3074e25daa383aad8813a9c3552aa2ac9f40eecab4904b8b477da5d42a5b4
pdf-font-stream PDF embedded font (sfnt) at offset 0x13064 10708 bytes