Malicious PDF — malware analysis report

Static analysis result for SHA-256 edc4b52e9151a588…

MALICIOUS

PDF

78.8 KB Created: 2021-08-25 22:02:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2d7bec4f6ef12205b9dffc416cffbfac SHA-1: 0997ae2f939e015b99e301ccec4c668dc7dd0f84 SHA-256: edc4b52e9151a5887da9566725a2029d40c457873dd55200162113ad15a1efd1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely used to facilitate the redirection or obfuscate the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 7

  • 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.
  • 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://synerhu.ru/uplcv?utm_term=passive+voice+worksheet+with+answers PDF link annotation
    • https://cherrychile.cl/cherry/uploads/contenido/files/nereverekosed.pdfIn PDF document text
    • http://01host.ru/userfiles/files/14605293135.pdfIn PDF document text
    • http://carshopm.com/js/upload/files/44286195393.pdfIn PDF document text
    • http://engineersclasses4competition.com/files/others/11278899207.pdfIn PDF document text
    • http://kowel.com/ckfinder/userfiles/files/1628285370.pdfIn PDF document text
    • http://campfirewtx.org/userfiles/file/mobatomavagugizijopal.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160aa08a6be083---jewesilewobexosomaba.pdfIn PDF document text
    • http://sparkpro.lv/content/file/61687360039.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/58595909448.pdfIn PDF document text
    • https://edgecs.com/documents/dazeligadilivatumupapupex.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/mt01jbo7j8vffpksipq3vgi6r0/sozimemigonojak.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/85059544774.pdfIn PDF document text
    • http://metrocars.london/survey/userfiles/files/raxezewagovogemoburevuta.pdfIn PDF document text
    • https://larrialdiak.es/files/galeria/files/48515378087.pdfIn PDF document text
    • https://sunrise-photon.com/upfiles/editor/files/finulatata.pdfIn PDF document text
    • http://mid-europe-ex.com/images/blog//file/71953470608.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160806270147cc---denukarijixigubo.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1610479a126eda---79056364299.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/00sfnqc3fn4176gehlm2aus4vh/noxewusuruzo.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608960d9a0a14---89496597811.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dbd90722dc6---ludosukaguremeri.pdfIn PDF document text
    • https://fotokeramika.bg/userfiles/file/xuxazi.pdfIn PDF document text
    • http://fincasotilloviejo.es/files/sotillo/_repo/file/68561259973.pdfIn PDF document text
    • https://thietbidiensino.vn/media/ftp/file/dizazigovijejek.pdfIn PDF document text
    • http://dpholding.ru/uploads/files/65272147337.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_off0000d1c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e9dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9DD 10528 bytes
SHA-256: b067acae1ac30f4dceabe6f4f7db3afbd105bd95e130693b6bef293fe3dab497
font_02_sfnt_off000101e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101E6 16840 bytes
SHA-256: 014d428548e0978e26e20d876c5f67242c0b944259d621ec7573be2751f9c67f

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