Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef843475c8e8797f…

MALICIOUS

PDF

86.7 KB Created: 2021-08-09 17:47:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 45d1e75a6f2dd3b0cee9bae23e656001 SHA-1: 3414b2d4dce1453200143721dbe6c23177385a9f SHA-256: ef843475c8e8797f75238719e42b386aecab5de7c9ef77dbfbfdcc929a595775
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It functions as a link farm, containing numerous URLs pointing to potentially compromised websites or disposable hosting, suggesting an intent to redirect users to phishing or malware download sites. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 https://irlanc.ru/uplcv?utm_term=prentice+hall+biology+textbook+miller+levine+pdf PDF link annotation
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083edf31442d---zumamezafaxugetalidopen.pdfIn PDF document text
    • http://metaglas.kr/userData/board/file/47147235353.pdfIn PDF document text
    • https://bbpartner.cz/userfiles/file/winalaxovafogodejodegib.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/db0f728cb6cf354a7b7c57e523ec650a/37065126034.pdfIn PDF document text
    • https://norservis.com/files/files/felujugubevizonesitejel.pdfIn PDF document text
    • https://www.helpforbusymums.com/wp-content/plugins/super-forms/uploads/php/files/4d1cefd6b09f34749f9b9e5f75f192b9/dakix.pdfIn PDF document text
    • http://4bx.pl/public/file/tabanired.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202104/file/50511854942.pdfIn PDF document text
    • http://soflacops.com/clients/83266/File/foximuxu.pdfIn PDF document text
    • https://legacyltg.com/wp-content/plugins/super-forms/uploads/php/files/57e0047e157aa9612e03f574113013f2/82606584728.pdfIn PDF document text
    • http://imcborivali.org/userfiles/file/judibujagunajo.pdfIn PDF document text
    • https://majubesar.org/contents//files/67692430050.pdfIn PDF document text
    • http://praxis-greve-polley.de/web/editor/files/27361602685.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/7bd16a359e6c6f5f925cfef52ad5caaa/nadaninubavojunewaminod.pdfIn PDF document text
    • http://mya1fc.com/files/ckuploads/files/83243035499.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fb68c763d88---podajowimasaranojiwid.pdfIn PDF document text
    • https://alyosserspneed.com/userfiles/files/nodokolosale.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c72b3795f4d---23106117244.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609f2bc4b2313---dodiligum.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086f2df346a9---39728461457.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/9db536209f07d04bce961b60a8d990ad/2796658633.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a00aafa498e---75725733726.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d70f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD70F 16428 bytes
SHA-256: 03e81ca251ad299e88272d2ecee12e1f1ab1db977246ce44dca151fa7ec5596d
font_01_sfnt_off000101b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101B9 11412 bytes
SHA-256: 7af8cb1dc425daaa600d157f51d808aad0d98601026d8863eda43321ddc57ca7
font_02_sfnt_off00011c17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C17 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00013428.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13428 16648 bytes
SHA-256: fb4e068b49c29ed084d58818643f879fb1e05785033fe78b202c0c4ec8b97d17

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