Malicious PDF — malware analysis report

Static analysis result for SHA-256 4835839c8ce12329…

MALICIOUS

PDF

75.7 KB Created: 2021-09-18 01:38:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: bff54a721ec3afd47efa7101387cd7d7 SHA-1: 5d46e027dd6ee7fc60011983a86c4c621adf2aa5 SHA-256: 4835839c8ce123299f2e02ef30c06e17dc4a42c01ffa4cc0f319d5ff475b237e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, a common technique for executing malicious code within PDFs. It also features numerous external links, some pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://deltarealestate-eg.com/userfiles/file/ginavibufijakasixesap.pdf In PDF document text
    • https://bushregenerators.net/userfiles/files/11076282038.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/299d3facd31fbbda67144499c34f6499/16299482820.pdfIn PDF document text
    • http://balcimimarlik.com/resimler/files/66029156431.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/94309161862.pdfIn PDF document text
    • http://railwaysrailroads.com/upload_files/files/mosefixesewuzo.pdfIn PDF document text
    • http://www.park-seversk.ru/other/js/ckfinder/userfiles/files/fafisikanaro.pdfIn PDF document text
    • http://mesterteto.hu/userfiles/file/gonefizezubazivodop.pdfIn PDF document text
    • https://maharajganjtimes.com/assets/ckfinder/core/connector/php/uploads/files/dumefirujumupakija.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/6jnhnhbu2rs7ogccqcmsm6g7a4/vixirijopumabaneviziri.pdfIn PDF document text
    • https://christianklein.eu/Quansis/ckfinder/userfiles/files/kowidolof.pdfIn PDF document text
    • http://brno-skoleni.cz/ckfinder/userfiles/files/77678477665.pdfIn PDF document text
    • http://www.cenlafilm.com/siteuploads/editorimg/file/mubovatubelirowadapiju.pdfIn PDF document text
    • https://grupo-kayros.com/userfiles/file/suwutusexujelaruwiwiwa.pdfIn PDF document text
    • http://exhibitionchannel.com/upload/tevodemozusodepadojepi.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/4d2e19a8e3eb6424b48b8a0a30371710/joxadopeliwezufi.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/93e96d29bf8038bc87f9ef85b0c2f441/58134316420.pdfIn PDF document text
    • http://leylatoprak.com/userfiles/file/tododagituwafeduxusaduzi.pdfIn PDF document text
    • http://trinitysportsandleisure.ie/userfiles/file/sofoguk.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/161442d1c84028---vefusiravamisiru.pdfIn PDF document text
    • http://solo-reisen.com/media/images/file/5287335913.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+import+phone+numbers+from+android+to+iphonePDF link annotation
    • 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_off0000c3fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3FB 17088 bytes
SHA-256: ba9d052fe0ed05f6d5b0682702ed3d9380330ae626dd48bc7e1a3d20480c110b
font_01_sfnt_off0000f014.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF014 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001082b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1082B 11032 bytes
SHA-256: 1604e52d350ddfc9e37008a7bc60b2d8fd70b4aa5ecf425d0018b7277fea3d1c

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