Malicious PDF — malware analysis report

Static analysis result for SHA-256 43072882f837731e…

MALICIOUS

PDF

95.7 KB Created: 2021-06-26 20:58:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: b66d1267ea4f5583d3a0a2f7de892072 SHA-1: ce72ba8fae36d23c698ce03427ffb73a9528581d SHA-256: 43072882f837731e75b6e8dff5f03bf25c6ebba7e00ed0be45cc598867078064
96 Risk Score

Malware Insights

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

The PDF file contains a link farm directing users to numerous external websites, with several hosted on compromised CMS platforms. The ML classifier strongly indicated maliciousness, and the structure suggests an attempt to lure users to potentially malicious content or phishing sites. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

Heuristics 5

  • 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://lycee-elm.org/userfiles/file/38620574191.pdf In PDF document text
    • https://www.idahomedia.com/wp-content/plugins/super-forms/uploads/php/files/506039e22d6d9c55e62ec44cf70cc70e/11714408183.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607a6d3ca6ac5---fewinobifolariberaf.pdfIn PDF document text
    • http://ebsenglish.net/_UploadFile/Images/file/lirorudawatijigapatuvosan.pdfIn PDF document text
    • http://garderoba.sk/images/_file/wifumajomadusogimete.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16098a1cfc8631---muriwexefadikupideda.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/7ede7c7d1ad8cec6dd70dc5737fe31ab/fujunurulefi.pdfIn PDF document text
    • http://jentretiens.ch/uploadimage/rimupen.pdfIn PDF document text
    • http://chnli.tw/CKEdit/upload/files/88173978353.pdfIn PDF document text
    • https://unicornccc.com/ckfinder/userfiles/files/66310067195.pdfIn PDF document text
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607d8c6803f97---xixorakubejemenikudix.pdfIn PDF document text
    • http://benevolo.it/userfiles/files/47287168315.pdfIn PDF document text
    • https://hnhaa.com/userfiles/tnejp//files/68062223764.pdfIn PDF document text
    • https://ahreco.com/uploads/news_file/98588309724.pdfIn PDF document text
    • https://nanyangtextile.com/userfiles/file/76541230188.pdfIn PDF document text
    • https://info-jimukyoku.jp/lot/upload/files/62767795963.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/e4eef5ae41b465ce07a977dbe06bac2b/86671109.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bfe5d6ba9de---80965545087.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/0d8e305d220efeaadbdeb6450d5e8a52/43025369875.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160b608aa458ad---miloresuvipiloj.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/o9hk3v3n4go869thbrc7301fud/fosobexenukotogadosowuj.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b852c223166---18714179929.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/ccd47f6d977de66f0836db4ec6358c6f/xovukonakamukufivujilawel.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/9d902daba3bd623bd13a48bd14c2acbc/58934273283.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=state+of+treasonPDF 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_off00011377.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11377 10144 bytes
SHA-256: 34d9907844a7df37ac812c5cd9a38209651aebd894cfcfdf9f26729d3016cc03
font_01_sfnt_off00012a42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A42 18308 bytes
SHA-256: 020a2f49d1d678935e5239897f48e86a73fffaace7f49b37ec03bfab401c17d4
font_02_sfnt_off000159f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x159F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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