Malicious PDF — malware analysis report

Static analysis result for SHA-256 daaaa16de0d6b57b…

MALICIOUS

PDF

80.0 KB Created: 2021-09-14 16:51:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 67ed3a42089439b889f2c51ea9bdac23 SHA-1: 1bc4250e11cfd89b30f226f3c0170967465c924f SHA-256: daaaa16de0d6b57bc51bcb8b88c0690fd9e7c3b169f486b74c1b5d9b72d25c59
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised websites or are part of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The file's structure and heuristic firings suggest it's intended to exploit user interaction via links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://wastran.ru/uplcv?utm_term=basic+probability+worksheet PDF link annotation
    • http://ecosdaliberdade.com/ckfinder/userfiles/files/4064342375.pdfIn PDF document text
    • http://divapharma.com/uploaded/file/kisegadozeruboxagobuzabi.pdfIn PDF document text
    • http://agapetown.net/ckfinder/userfiles/files/garuvil.pdfIn PDF document text
    • http://gaestehaus-am-erlkoenig.de/img/editor/file/wutozagimebemekapus.pdfIn PDF document text
    • http://prepearl.com/uploadsfile/lokomirobelinibobuzesugor.pdfIn PDF document text
    • https://argentinaproduct.com/ckfinder/userfiles/files/fawaladatulu.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/16138c7081427a---sozuwibadabowu.pdfIn PDF document text
    • http://movietek.vn/hinh-anh/files/fagugulilot.pdfIn PDF document text
    • http://xn--o39a91gvwm83kbsn.net/FileData/ckfinder/files/20210907_1DDE2A617D8529A8.pdfIn PDF document text
    • http://iccjsc.vn/images/uploads/files/sisulolomanopuxixoj.pdfIn PDF document text
    • http://mitsubishilongbien.vn/images/ckeditor/files/95930693775.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/16prcfvf3oma05la84m4jq2444/siketol.pdfIn PDF document text
    • http://lamekatus.com/uploads/ckeditor/files/pigufosafider.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d2b1ce6d16---83698360380.pdfIn PDF document text
    • http://es-manzokudou.com/yamituki-n/uploads/files/pejitugesasovesigu.pdfIn PDF document text
    • http://solarwindependence.com/ckfinder/userfiles/files/fuzidakujafadi.pdfIn PDF document text
    • http://moscow-vernisage.com/files/files/65836353164.pdfIn PDF document text
    • http://mgtuae.com/uploads/file/60347796792.pdfIn PDF document text
    • http://videocycling.info/files/file/67150390372.pdfIn PDF document text
    • https://rockyhotelsgroup.com/uploaded/files/fifeji.pdfIn PDF document text
    • http://moveworldtogether.com/datas/files/80354357816.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ab855dc2f8---zaxuvadagol.pdfIn PDF document text
    • http://daiichigroup.net/uploads/news_file/duzuzetibewofuw.pdfIn PDF document text
    • https://b2b-intelligence.it/uploads/file/buxonetakiwogatu.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_off0000d5e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5E5 10852 bytes
SHA-256: 72785891fa4f097c9dcdeffae22593b6f534b90ec2fd6d4a7f79c82c0aa9c27e
font_01_sfnt_off0000ef08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF08 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001071a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1071A 16928 bytes
SHA-256: 2efc23ec32a03760634079b0b7d0b9531757139dfec58d17ed857ecaf4d2c883

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