Malicious PDF — malware analysis report

Static analysis result for SHA-256 818357b9ae6fd71a…

MALICIOUS

PDF

114.8 KB Created: 2021-09-01 05:32:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e81230274e3ced8cd4597673a3c74282 SHA-1: 89f3db971189db8de7a8b571fd4352c06b7b1640 SHA-256: 818357b9ae6fd71a55520ecb7c1b5fa2a671763818425b0fb728afa8440c6aaa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of external URIs and links to compromised WordPress upload storage, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://drafthe.ru/uplcv?utm_term=the+ionization+potential+of+hydrogen+atom+is PDF link annotation
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ad320d52807---kafuwutogupo.pdfIn PDF document text
    • http://nirmalapublicschoolerumely.com/userfiles/file/sokiguloxikigopusuzusexu.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/16113b0ade3af8---13774405699.pdfIn PDF document text
    • http://medi-sen.com/files/files/tasafalaxalalugoteguropip.pdfIn PDF document text
    • http://chipublichouse.com/ckfinder/userfiles/files/menevan.pdfIn PDF document text
    • http://gjbbang.com/userData/board/file/porikisixata.pdfIn PDF document text
    • http://vuonlan.vn/data/upload/files/42870079015.pdfIn PDF document text
    • http://meuble-tunisie.com/userfiles/file/17543090257.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606fcaea14bf1---45424927237.pdfIn PDF document text
    • https://dangeloremodeling.com/nbloom/fckuploads/file/zosuwidalelakenebapibigo.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/2vud77s9im2eehp40goanbuob7/xabebu.pdfIn PDF document text
    • http://moonlightmontessori.com/upload/files/xariweletunatu.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/9qoflncgn56521rp6urba4hrdv/moromupis.pdfIn PDF document text
    • http://innersolutions-uk.com/file/fipujekijodulopo.pdfIn PDF document text
    • http://xoblates.com/clients/e/e0/e08cfb93fb97b00c28394d0532709dc9/File/382742241.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac0ca40ea1b---49986041968.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbdbcf5a927---bipefenowovazemajapekuti.pdfIn PDF document text
    • http://ouhkpthaa.org/userfiles/85187442358.pdfIn PDF document text
    • http://shtaket46.ru/page_edit/_samples/userfiles/files/tejadipederekunedexof.pdfIn PDF document text
    • https://jokerprod.net/userfiles/file/73185521202.pdfIn PDF document text
    • https://cplastik.net/data/cms/file/17665379562.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bbcb94e79df---nudinoxesiwotubi.pdfIn PDF document text
    • https://phunhai.net/upload/files/wetojebolabira.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_off0001564d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1564D 11084 bytes
SHA-256: c0edbb9d5a163bee1b15368ffa4ecf096966c96df07d40e072fb16c6c558197c
font_01_sfnt_off00016fc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16FC7 20692 bytes
SHA-256: 5d9c3de4da02b66ca91dc2573528e2cb77a902facc8237ded1a336efb23eb268
font_02_sfnt_off0001a583.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A583 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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