Malicious PDF — malware analysis report

Static analysis result for SHA-256 70e7891b036a4280…

MALICIOUS

PDF

82.2 KB Created: 2021-09-12 15:53:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1afa3fbc80c011a184572d9db4a7bcc6 SHA-1: 75a355068373eacb3434494191d1df1612e1d560 SHA-256: 70e7891b036a428052987747b26fe65261dffc469eac146ece56063157eacad8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites or download further payloads. The presence of embedded JavaScript suggests an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://friend5190.xyz/js/ckfinder/userfiles/files/luwufunifikaza.pdf In PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/3d8761c6e46e458d632fcebfd40aef06/72359758733.pdfIn PDF document text
    • http://yusungchart.com/userData/board/file/92960636256.pdfIn PDF document text
    • http://qiuyutv.com/userfiles/files/20210908030055.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/bekaserokosokobizawaz.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/ihk8p7pmu8pvrhu1m5fpbg644l/jugewamebumawipisokusu.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613b18c393c3a---fodigaga.pdfIn PDF document text
    • http://studiotecnicoarduini.eu/userfiles/files/5850079075.pdfIn PDF document text
    • http://3bbb.fr/ckeditor/upload/files/lojoxozafinukake.pdfIn PDF document text
    • https://cian.hr/userfiles/file/depotesomafopavozo.pdfIn PDF document text
    • https://easypayindia.in/userfiles/file/raxokapunilediwopopuw.pdfIn PDF document text
    • http://pactolous.hu/upload/file/53141954092.pdfIn PDF document text
    • http://aktifimmo.lu/userfiles/files/pegetepefewazimesesaz.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/jadozamavojemo.pdfIn PDF document text
    • http://ajisushionline.com/uploads/files/piwajubamup.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b664dd8251---ralijovujurugodajapobedag.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/ncauv6158ci1loipgqoqg98st7/64816115092.pdfIn PDF document text
    • https://spitalmoldovanoua.ro/ckfinder/userfiles/files/43357855768.pdfIn PDF document text
    • http://newshop.jp/archive/file/kewugononenozidaxex.pdfIn PDF document text
    • http://abwmercury.com/uploads/files/xifegepodavigevujawavufon.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///pejej.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/161394b0656b88---91856447550.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b7b985a24b---89389744129.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130ed023350d---lanigunituromuwilo.pdfIn PDF document text
    • http://infinivideo.hu/sites/infinivideo/files/72290243515.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=make+apk+in+android+studioPDF 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_off0000de2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE2B 17288 bytes
SHA-256: caef600a8969e453295ddf62b2ef2d38aa2ffd4d7b08c416cac05005a90d39ed
font_01_sfnt_off00010b12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B12 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012329.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12329 10524 bytes
SHA-256: 01f2375e5a33d18f596ec65a3d37eabd6530f6b1fc69a9f111e71cea2be89c9e

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