Malicious PDF — malware analysis report

Static analysis result for SHA-256 90b1e7556fa2f879…

MALICIOUS

PDF

98.4 KB Created: 2021-07-13 18:49:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 9c2afafc7839fe113789c9b4a9c87481 SHA-1: 9e2320a8a4252ff88bedb6295562c2d49a94e4c1 SHA-256: 90b1e7556fa2f879f7e60bd900d8dc361ee2e1bdd0d414301ec6f50f8e270ab7
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via these links. No scripts were extracted, but the PDF structure itself is used to host these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://cnpair.com/userfiles/file/dojapufiwalelimekig.pdf In PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c99df9d97d4---bimiganakoje.pdfIn PDF document text
    • http://mp-journal.com/media/file/fumurevabebatebujigoxugez.pdfIn PDF document text
    • http://forumcutuca.com/ckfinder/userfiles/files/xegifewojoxalizunegapa.pdfIn PDF document text
    • https://aedwea.com/upload/foto/bepemikuwilupasufiwetaxum.pdfIn PDF document text
    • http://bhsclassof70.com/clients/a/ac/acf0241a72c9eb28a719a759cf8a4748/File/pesokezikitituwagab.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16083ed21c7972---79961666259.pdfIn PDF document text
    • https://sayurhijau.com/contents//files/notusuzirupujo.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/160c8a10a5426e---84200114418.pdfIn PDF document text
    • http://wagnerpc.com/userfiles/files/sogiloginugigukiwi.pdfIn PDF document text
    • http://ambulatorioveterinarioscapindandrea.it/userfiles/files/zewaneluvilu.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/pagiluzasijegonefinobe.pdfIn PDF document text
    • http://atraba-holding.com/userfiles/file/68031547819.pdfIn PDF document text
    • http://eventcompany.org/clients/e/e3/e30ef11cf4efe639fe6592aa37b9cb94/File/worewemusalikiwiwikuna.pdfIn PDF document text
    • http://esthebel.de/userfiles/file/nuvaxegalipi.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/0d8271694e808b0e3084edcb4893e268/20300103508.pdfIn PDF document text
    • https://www.justgym.co.za/wp-content/plugins/super-forms/uploads/php/files/8a7e12t9va01ja9bor0s95vfek/67280795765.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/vtgo1eck18dqbk21abfdugrlr1/53038828484.pdfIn PDF document text
    • http://go-pxl.com/uploads/files/43744880872.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160d5233e1e5ee---lalifupavujiwujika.pdfIn PDF document text
    • https://samarpanbharat.org/trila/userfiles/file/migatejopotimebewaxupenun.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b561be4e70e---95624787237.pdfIn PDF document text
    • http://tlumacz-lipno.pl/pdrzewiecki/files/wejupexiji.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/9637ccbfd0354549d40f27d70d28e7c1/dogetazi.pdfIn PDF document text
    • http://byty-pardubice.eu/UserFiles/File/96539960711.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=make+crafting+table+minecraftPDF 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_off00011d1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D1C 17344 bytes
SHA-256: 8a29ccc38a6b6c1eeb888937c7e1e991dfaa3fb881268f378e29ad28048097df
font_01_sfnt_off00014a4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A4D 10616 bytes
SHA-256: f92cc9522fb0db75ed86b25cac8f9a3362da7c31260812e3f31aff6f72d2b4ed
font_02_sfnt_off00016290.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16290 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1