Malicious PDF — malware analysis report

Static analysis result for SHA-256 d219935b9efc248a…

MALICIOUS

PDF

80.8 KB Created: 2021-09-21 04:43:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7d03c5534b22b69a28c7c97885e9aacd SHA-1: 212a19c93f5c1eaae43747dcd9f0361f89448981 SHA-256: d219935b9efc248a70aee40850662779949bf0ccb5f965bd5e1b5d5d61d7cf22
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and numerous external URIs, many of which are identified as part of a link farm hosted on compromised or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for initiating malicious actions within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • 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.
  • 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 https://ketchas.ru/uplcv?utm_term=concise+biology+class+10+textbook+pdf PDF link annotation
    • http://gestaocipa.com/public_html/Imagens/file/pesopijobisaravorexapisa.pdfIn PDF document text
    • https://digitaldaya.com/imagenes/file/41840936393.pdfIn PDF document text
    • http://goodfortune.hk/UpLoadFile/file///nilok.pdfIn PDF document text
    • https://eltechma.com/zdjecia/fck/file/48742200009.pdfIn PDF document text
    • https://sensormaticltd.com/app/templates/js/ckfinder/userfiles/files/88729550739.pdfIn PDF document text
    • http://gardenofsound.com/userfiles/files/wisovasaxaluwenemo.pdfIn PDF document text
    • http://tjsyjdq.com/v15/Upload/file/2021918145137591.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/3sp7l3jgu3vcolvlg308i8m928/93238342586.pdfIn PDF document text
    • http://baozhaopharma.com/upload/files/99804007683.pdfIn PDF document text
    • http://uptownherndon.com/uploads/files/pakuborel.pdfIn PDF document text
    • http://epwuae.com/userfiles/file/97593853246.pdfIn PDF document text
    • https://www.premiumtrade.ro/ckfinder/userfiles/files/42953735141.pdfIn PDF document text
    • http://rustproofingottawa.com/userfiles/file/44440638254.pdfIn PDF document text
    • http://problemconsulting.com/img/download/files/zogufetofinimirud.pdfIn PDF document text
    • https://milliondollardesiclub.com/upload_files/featured/files/zimuxipexajafawefokuni.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/16142b1a55c4e5---91450900117.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/2d89bf25f28adc0ddb89355febd66b50/livizajinoromitujola.pdfIn PDF document text
    • http://kindergartenhelden.at/upload/file/49930530425.pdfIn PDF document text
    • http://hanasushipickup.com/uploads/files/milasokajalat.pdfIn PDF document text
    • https://alwaysthesame.pt/site/upload/file/webirunitavebamufirubud.pdfIn PDF document text
    • http://medicom.pl/userfiles/file/gomow.pdfIn PDF document text
    • http://hz-karavany.cz/ckfinder/userfiles/files/fotizuvapavukomewapomasu.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_off0000d6f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6F9 11348 bytes
SHA-256: 935bbb45912435213affed7f11cf88c2e8761ae29b4c791702da802d145a48b2
font_01_sfnt_off0000f189.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF189 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001099b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1099B 17044 bytes
SHA-256: 322d9f890a814805be7c64c1731cce751b515d16abd6c9ae8e0b3fd9096ff290

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