Malicious PDF — malware analysis report

Static analysis result for SHA-256 714990c6404db845…

MALICIOUS

PDF

80.1 KB Created: 2021-09-09 20:56:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9b025f8b067522b593fdb6faeb1425bf SHA-1: 269a56f029ae9655759724e9fb6ed753f0ea2f59 SHA-256: 714990c6404db84533416c8c78736966f155231cde96c2e1f82396919957882d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are part of a link farm hosted on disposable or compromised domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://catamma.ru/uplcv?utm_term=android+1+ski+safari+2 PDF link annotation
    • http://tufaghanafc.com/js/ckfinder/userfiles/files/gaseneduwebevifexamo.pdfIn PDF document text
    • https://leresto-niort.fr/images/userfiles/files/98868002340.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1612f53df10b9e---10446867494.pdfIn PDF document text
    • https://femagnet.com/upload/edu/article/file/rupiwobotidokufozavifasam.pdfIn PDF document text
    • http://www.videobezopasnost.ru/ckfinder/userfiles/files/polawuveponobesukedun.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/xamafuje.pdfIn PDF document text
    • https://hogozaty.com/ckfinder/userfiles/files/kugivoliwewarodiri.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139b8c1582cf---sawolusanafexosisovi.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/161366cc81ec1d---lamigekolere.pdfIn PDF document text
    • http://raffaelecavazzoni.com/userfiles/files/1569915917.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613775784ff4f---91988161562.pdfIn PDF document text
    • http://imbirimbir.ru/files/jasadaser.pdfIn PDF document text
    • https://aspirecambodia-edu.org/userfiles/file/67852029926.pdfIn PDF document text
    • http://uni-soar.com/userfiles/file/64561740261.pdfIn PDF document text
    • http://www.udelimpa.es/ckfinder/userfiles/files/xatugupejed.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210907084916911307482.pdfIn PDF document text
    • https://transdeliveris.lt/userfiles/file/jefininadetezexofetu.pdfIn PDF document text
    • https://27061010.com/uploads/files/202109050036463164.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16131548e9450d---72142659142.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131ff8e9f4fb---5807057798.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021091000382345.pdfIn PDF document text
    • http://lixupeng.com/uploads/files/10334971758.pdfIn PDF document text
    • http://wdnederland.nl/file/53640169030.pdfIn PDF document text
    • https://olivierdaulte.com/ckfinder/userfiles/files/65616318167.pdfIn PDF document text
    • https://tes-sys.com/uploads/ckfinder/files/20210904/16307531046792.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_off0000d652.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD652 10316 bytes
SHA-256: a3938da6fd263173ace272b376bc090f54b9d7cf9e60e9c8434678715da0b0e0
font_01_sfnt_off0000edc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000105d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105D9 17332 bytes
SHA-256: aaee39f07b0242dc02d09a37edca9da74730139c2cf7cf0bb7113c40475b4a76

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