Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9f1e71b9d6e8b17…

MALICIOUS

PDF

97.9 KB Created: 2021-08-11 16:47:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4e68d8dadfea1d1366454d2fd2d1e116 SHA-1: cebdbe2c30480646cb714031561876c197e4e477 SHA-256: a9f1e71b9d6e8b17a467b9327391d8e9d07eb634d7b6f41d903c0d3d3671de40
184 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 WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://hiace-yoshikawa.com/js/upload/files/mejuvipodirokuderutenive.pdf In PDF document text
    • http://atmaircenter.com/lb/userfiles/files/4694856687.pdfIn PDF document text
    • http://benetworkingpro.com/ckfinder/userfiles/files/dajafekenulabenebo.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095d53cd0c29---86233472228.pdfIn PDF document text
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160741aa1ebd02---binekarumazi.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/1608d78f308c0d---fevukepuwixunokavuwozakiz.pdfPDF link annotation
    • http://orourkelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/95356529067.pdfIn PDF document text
    • http://hongpakthai.com/ckfinder/userfiles/files/kupegagazem.pdfIn PDF document text
    • https://amerismithenterprises.com/wp-content/plugins/super-forms/uploads/php/files/c96f566a63fb741c17eedc6578d157e0/57665228717.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/3a0fb11c04ab0d9ad00483abb59ff02c/30105366360.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160852861052e7---46658575162.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160aa050874374---wulumosugebawawafuna.pdfIn PDF document text
    • https://chiuman-hk.com/images/file/11582059448.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16086f92629540---jabubutugeledugiguwupu.pdfIn PDF document text
    • https://danielstrehlau.com/userfiles/file/gunukuf.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/160754e4593b14---romur.pdfIn PDF document text
    • http://ahchala.com/img/file/81562992202.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/3f4kb3stftg48hgsjlq09uo8v3/87484736429.pdfIn PDF document text
    • https://karinbentum.nl/uploads/file/viwozoguxoneli.pdfIn PDF document text
    • http://colegiosantarosa.com/uploads/imagem/file/dexedenibegalapidabap.pdfIn PDF document text
    • http://energo-market.ru/sadm_files/31149430064.pdfIn PDF document text
    • http://studioguidobarbieri.it/userfiles/files/rikilijibafigoxef.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1ef0dbff13---vakeri.pdfIn PDF document text
    • https://floridaholidayplanner.com/wp-content/plugins/super-forms/uploads/php/files/2583d1d15ffa6455ea4d10546c7ab80b/12982636654.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/57c5b88507cffc394b3145a287361a2c/90789118512.pdfIn PDF document text
    • http://lesen-und-schenken.de/userfiles/files/mumujewatewisafowu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=slader+thomas+calculus+14th+editionPDF 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_off000115a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115A4 10940 bytes
SHA-256: fb8b28a4b124701affb939e8be47ecb5d4b8d92c6f5be88d8b876eb7d35ce6a9
font_01_sfnt_off00012ed8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ED8 18508 bytes
SHA-256: 3697c1cabcd57faa7b4f6034f1908971dd078302b01ca16840565f00041c49bf
font_02_sfnt_off00015f0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F0D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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