Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b9269b5625b0f70…

MALICIOUS

PDF

72.1 KB Created: 2021-09-13 10:38:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: fd6fa70bdc9603752ec950852a74d374 SHA-1: 8dfd05416a4a94c1e6ddcecd6b3b261742c57cc4 SHA-256: 9b9269b5625b0f7028553b98ae641ecbe7c55fc1f8847cd071a5ed20fd28d847
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The ML classifier strongly flagged this PDF as malicious. The presence of numerous external links, many pointing to compromised or disposable hosting, suggests a link farm designed to redirect users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9885

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://japhina.com/upload/file/fatofozaxir.pdf In PDF document text
    • http://www.musicboxpiano.com/contentfiles/kidigoxadugusalubaxaj.pdfIn PDF document text
    • https://poganyvolgyi.hu/userfiles/file/5120712753.pdfIn PDF document text
    • http://kibbkw.com/uploads/files/81079573074.pdfIn PDF document text
    • https://armagedonspedycja.pl/files/file/64015673349.pdfIn PDF document text
    • http://fantasymusic.it/userfiles/files/xupobefajokazajon.pdfIn PDF document text
    • https://aslimitada.com/userfiles/file/74939113232.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139340937da0---192945948.pdfIn PDF document text
    • https://ingatlansos.hu/images/userfiles/file/95568012821.pdfIn PDF document text
    • https://cobrawire.com/userfiles/files/20704026794.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/085446c9fd57e3c6ea681cc360c99a60/tewetidewodowomagikokola.pdfIn PDF document text
    • http://kaushalacademy.org/ckfinder/userfiles/files/jokexa.pdfIn PDF document text
    • http://inphuduong.vn/upload/files/foxijataxototukopijusaw.pdfIn PDF document text
    • http://cesishotel.lv/res/wysiwyg/file/lawoxowamibofun.pdfIn PDF document text
    • http://locum-system.pl/userfiles/file/joroboxeselixom.pdfIn PDF document text
    • http://volvo-cars.jp/js/upload/files/wezorakelotuvov.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/d4e6a29ecce337a9ce2736cabc425694/pabarolokur.pdfIn PDF document text
    • https://himalayanthailand.com/image/upload/File/jigebapawezokaw.pdfIn PDF document text
    • http://iccjsc.vn/images/uploads/files/sisulolomanopuxixoj.pdfIn PDF document text
    • http://baocaosudanang24h.com/uploads/image/files/23729573310.pdfIn PDF document text
    • http://dtyxbpzx.com/filespath/files/20210903134442.pdfIn PDF document text
    • http://hotelpenza58.ru/ckfinder/userfiles/files/wewafofaziwepetojexizir.pdfIn PDF document text
    • http://candybeauty.vn/upload/files/jisif.pdfIn PDF document text
    • http://www.cerel.eu/images/wyswig_images/file/25360241583.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/ad38c0312580c34bfe12af56ed676707/xujen.pdfIn PDF document text
    • http://hiro-seiko.com/upload/files/69942958274.pdfIn PDF document text
    • http://vtvxm.vn/userfiles/file/milemedorenorolifig.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=free+android+game+source+codePDF 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_off0000b92d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB92D 10644 bytes
SHA-256: b91c09f8fe17ee94b8b4fc83197564adbd311f6b6fbcf8ae746ae66bdb13e595
font_01_sfnt_off0000d13d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD13D 16176 bytes
SHA-256: 232df60444c9486c49ac4508ec8b46c14d0ce436327d559882be11fb96c6417f
font_02_sfnt_off0000facb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFACB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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