Malicious PDF — malware analysis report

Static analysis result for SHA-256 09ecc3b828e2cae7…

MALICIOUS

PDF

82.6 KB Created: 2021-08-17 01:55:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0ea0e14bcb987e000a0ccf8389c9522a SHA-1: 95c226836cc31616d670cb25c38b583931abf4de SHA-256: 09ecc3b828e2cae7474e565a49c4a2988e6a629ce0b03bd90605217078274b19
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, flagging it as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to other PDF files hosted on various domains, some of which appear to be compromised WordPress sites. The primary purpose seems to be redirecting users to malicious content, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://csc0451.com/userfiles/file/20210706072502_pg2d2z.pdf In PDF document text
    • http://phantasos.org/userfiles/file/49752959792.pdfIn PDF document text
    • https://didacostruzioni.it/userfiles/file/22636610229.pdfIn PDF document text
    • http://agiusfuneraldirectors.com/files/file/61746621387.pdfIn PDF document text
    • http://canyonoaksmtg.com/~duckdi5/canyonoaksmtg.com/content/file/43386787554.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606caaaa71d9c---98617982304.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/2a0272a2ab78c5ed567980e5b6b0ec11/16916411211.pdfIn PDF document text
    • http://pusancard.com/userData/board/file/1091217782.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/160adbe473be2e---17265265292.pdfIn PDF document text
    • https://arzhosting.com/calisma2/files/uploads/72358832544.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/515576482430536e076c74cd6353d34f/leporevamufepegemideg.pdfIn PDF document text
    • http://yoron.net/up/files/41852453722.pdfIn PDF document text
    • http://firegallery.ru/img/upload/midepokuguwowaroku.pdfIn PDF document text
    • http://solarhomepage.ch/fckeditor/editor/images/file/8554169620.pdfIn PDF document text
    • http://blessingsngo.in/userfiles/files/pilasefatirunazokogi.pdfIn PDF document text
    • https://patoman.ro/ckfinder/userfiles/files/milofepuzir.pdfIn PDF document text
    • https://mannerfeltdesignteam.se/ckfinder/userfiles/files/wusatojelar.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/1a01f2146d5b55c84fb259df2d6f8f33/monamamupuzo.pdfIn PDF document text
    • http://araonline.hu/uploads/file/96237269711.pdfIn PDF document text
    • http://apcmagon.com/userfiles/nenifekafonaruj.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/80855892210.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a210e82b272---16362542986.pdfIn PDF document text
    • https://littlelightnepal.org/userfiles/file/44247716210.pdfIn PDF document text
    • https://carea2plus.com/wp-content/plugins/super-forms/uploads/php/files/315413e723c6485e3406ab068b4b2e09/35812239139.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=cell+communication+worksheet+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://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_off0000dd66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD66 17388 bytes
SHA-256: 4d2c48526980885acd1458c80a5ddc29520095cd52b8869c7ffe8c54bcf14787
font_01_sfnt_off00010a7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A7B 11192 bytes
SHA-256: 1c83b565d8c64a255cd28be656a81fe159d2963587563d613d17b5de350c7780
font_02_sfnt_off0001248c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1248C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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