Malicious PDF — malware analysis report

Static analysis result for SHA-256 54d53ff435bb2ccb…

MALICIOUS

PDF

83.6 KB Created: 2021-09-18 04:11:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 147758395736347959df70b3b5a73e5d SHA-1: ab48d7ebd461b691c96de4a9b96b65188abf5278 SHA-256: 54d53ff435bb2ccb156103211e022b7c602e06e6aa6d318f82d1600f921c07aa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external URIs and link farms, with several pointing to compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure suggests it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://pistant.ru/uplcv?utm_term=paranoid+lyrics+ty PDF link annotation
    • https://china-glass-mosaic.com/userfiles/files/20210905_143633.pdfIn PDF document text
    • http://landonintergroup.com/ckfinder/userfiles/files/xidiginozoxegomefiv.pdfIn PDF document text
    • http://aweibel.com/Photo/file/vasegomojajajewumad.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/6qh7bo7r60uo0guscm00u61so2/sirine.pdfIn PDF document text
    • http://honeystraw.com/uploadfiles/file/15837997759.pdfIn PDF document text
    • https://falconshipping-uae.com/userfiles/files/78428103330.pdfIn PDF document text
    • https://cdmsig.com/ckfinder/userfiles/files/walakemore.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/161353136e92b7---78003457949.pdfIn PDF document text
    • http://torgoborud.org/images/file/nexixiriropigofowowawiw.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/161412ac5db787---talepi.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/i04jkht0ps47ucok3e8ck28bk6/93168002791.pdfIn PDF document text
    • http://damutech.kz/upload/2021/09files/210912230334743128jrjgw.pdfIn PDF document text
    • http://ityab.com/cache/fck_files/file/tezopuz.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/1613260a4d170e---94919424189.pdfIn PDF document text
    • https://ikuseikyokai.jp/ckmedia/files/jiwibezofukufuv.pdfIn PDF document text
    • http://henghuitong.com/jingkelun/userfiles/files/20210903131012.pdfIn PDF document text
    • https://mlspoland.co/files/file/zabuxuwogezejale.pdfIn PDF document text
    • https://noticky.net/akce/fotky/file/rurivibapawuvepemizuvogi.pdfIn PDF document text
    • http://pnmanagementsolutions.in/uploads/56959590567.pdfIn PDF document text
    • http://inistor.com/ufiles/files/wisedapumijesu.pdfIn PDF document text
    • http://jgweld18.com/UploadFile/file/20210909013107177.pdfIn PDF document text
    • http://thankschicken.com/uploads/files/zatefizeligu.pdfIn PDF document text
    • https://5uempat.com/contents/files/84255323946.pdfIn PDF document text
    • http://teamtrinity.net/trinitya/file/59683576066.pdfIn PDF document text
    • http://envisystem.com/upload/userfile/files/xinadogukedaburamekogu.pdfIn PDF document text
    • http://cozycornerexpress.com/uploads/files/jojategorisiz.pdfIn PDF document text
    • http://zkojicin.cz/userfiles/file/gopomebexaseri.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_off0000df73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF73 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f78a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF78A 10348 bytes
SHA-256: 3390f8ac095015aadc839a1cbdfdcfed4bc4cd76a93fb6d1e16d31a6ee3097c1
font_02_sfnt_off00010efe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EFE 19116 bytes
SHA-256: 7c7836e28060c08f3b6352c0d982c461a483aaca1b3bf966477659cbbf4dfcd5

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