Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa6154e608e2403f…

MALICIOUS

PDF

80.8 KB Created: 2021-08-09 21:45:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 96b0ffa94ff9a57634eae510381bb478 SHA-1: 72011c527d9c42c6de3ff1752114c71eb9c04b98 SHA-256: fa6154e608e2403fa8e8a73f85729d669bdc5569d018ea6917bf5f9782e6beaa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains a link farm pointing to numerous URLs, several of which are hosted on compromised WordPress sites or disposable domains, suggesting an attempt to distribute malicious content or phish users. The presence of external URIs and link farms indicates a likely spearphishing attachment vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 6

  • 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.
  • 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://galsabino.it/userfiles/files/xisoz.pdf In PDF document text
    • http://hitecds.com/userfiles/file/guxiruliwukafivazof.pdfIn PDF document text
    • http://www.barbazan-debat.fr/ckfinder/userfiles/files/32430867673.pdfIn PDF document text
    • https://bisnismedsos.com/userfiles/file/futiz.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/c2de61329f7261b8665a15660ad6e633/fusijigogukipozena.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/f769086b83979c7e69c6a5a2fdf0bf50/76122128712.pdfIn PDF document text
    • http://ptairsupply.com/userfiles/file/373715856.pdfIn PDF document text
    • http://tourbusan.net/FileData/ckfinder/files/20210702_E45C4049913E99CA.pdfIn PDF document text
    • http://nessium.fr/userfiles/file/79551023740.pdfIn PDF document text
    • http://architettoseneca.com/userfiles/files/gefiji.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160bbb83ebfa7c---tixuvibeto.pdfIn PDF document text
    • http://www.dawnrotaryclub.tw/UserFiles/files/14190109374.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/75cc0b6106eb9449dc98aa6148c0b5cd/sapogifibuxabejo.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/161042fef66ef1---wepuxe.pdfIn PDF document text
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/506761f54e9cb4a8d7934fb0c5ad5833/doditeji.pdfIn PDF document text
    • http://upperdublin1970.com/clients/3/3b/3b2fb281f4756d03d37a29c41a8c1d95/File/fapuvasodazibijakog.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160fe993c17cf7---28468885278.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072d55e7e6f2---masudolebuvovapaxo.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1d897d5e7---ziridapoxuli.pdfIn PDF document text
    • https://bajrahrs.com/userfiles/file/70594320715.pdfIn PDF document text
    • http://enidbtwcreunion.com/clients/5/52/52e94d62e82ff66504c7d921fc07bf70/File/19457782298.pdfIn PDF document text
    • https://stiff.pl/ckfinder/userfiles/files/bipominurutajenukigel.pdfIn PDF document text
    • https://kaptenhoki.com/contents//files/zukaxumimonopoxoto.pdfIn PDF document text
    • http://vuoncotichdep.com/upload/files/bugodiwizu.pdfIn PDF document text
    • https://anpheatingandac.com/nbloom/fckuploads/file/wadap.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=livro+elementos+de+maquinas+pdf+shigleyPDF 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_off0000d01a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD01A 19764 bytes
SHA-256: 502bd77e46abed178e93dac1c03571160a5bb01d20310b8578f59621de877e91
font_01_sfnt_off00010144.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10144 11328 bytes
SHA-256: 438d6ca79402c5eeb4e688f4f3c4a8080c2d84863e9a7f44c5c50793d1b4f703
font_02_sfnt_off00011b43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B43 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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