Malicious PDF — malware analysis report

Static analysis result for SHA-256 ade44ab76f93245a…

MALICIOUS

PDF

86.4 KB Created: 2021-07-08 05:26:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 410bec8bfe9cc2d66885713d55b64a55 SHA-1: d89d7ff0018ec1e4657f3e54be79b0275097a01f SHA-256: ade44ab76f93245a0d14ab5d50f47f94f7b22d14ff062b5668444da75ba2dc68
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It functions as a link farm, containing numerous URLs pointing to various domains, some of which are associated with compromised CMS uploads or disposable hosting. The primary purpose appears to be directing users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9938

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 http://donkaew-furniture.com/ckfinder/userfiles/files/nibidigerufupen.pdf In PDF document text
    • https://detectiveoffice.net/userfiles/file/vojogutegomulozib.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/cee233c9be8dd85e03b7c50e7cca36d3/96915934366.pdfIn PDF document text
    • http://jamessham.com/admin/usercontent/file/37202918762.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///tulivipolejot.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/9b80977040e86ee1c6ec85d461091fa6/jalagowewelevobe.pdfIn PDF document text
    • http://banphimchuot.com/userfiles/file/55661783762.pdfIn PDF document text
    • https://arendic.cl/files/85543801856.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607dbbb3e137b---60009305396.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099e2acbd915---22742173835.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c0519ce223c---83694502651.pdfIn PDF document text
    • https://sherwoodchamber.org/ckfinder/userfiles/files/gajatusuxenikivarumukona.pdfIn PDF document text
    • http://selfmadefilms.nl/userfiles/files/22862364245.pdfIn PDF document text
    • http://hongshengfish.com/uploadfiles/2021051205374274661.pdfIn PDF document text
    • http://kameleonhastanc.hu/files/file/zepavefixupamakamibiwusuk.pdfIn PDF document text
    • https://rubin2000-distribuitorshop.ro/userfiles/file/18194127449.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/7ebd1b637d846dd007986eeaf2dc0436/kivubapej.pdfIn PDF document text
    • https://emmaushuis.org/pages/79700832406.pdfIn PDF document text
    • https://tiklatakip.com/calisma2/files/uploads/28303702221.pdfIn PDF document text
    • http://naasschoolofmotoring.com/fckeditor/userfiles/file/83123120701.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160942dcdb9064---29753168790.pdfIn PDF document text
    • https://economiadecomunion.net/ckfinder/userfiles/files/93591593432.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160800d028c2fb---bodirubejivulewurimisipu.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b1398b453c1---32458546808.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607c15efe40f6---vuniriwutixeretaviwefani.pdfIn PDF document text
    • http://lotusburbank.com/uploads/files/wazupajoxu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=elements+of+interior+design+and+decoration+pdfPDF 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://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_off0000f192.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF192 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000109a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109A4 16876 bytes
SHA-256: 979c84a159555144ae8565b0c8d245b9a059380edf3de3cbf6e9468a02a08c5e
font_02_sfnt_off0001356b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1356B 10948 bytes
SHA-256: 75154edb5154fdb873c976f0341b38037177ee5d842af07566b114302434896a

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