Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bb09b83eab067a8…

MALICIOUS

PDF

89.6 KB Created: 2021-06-29 00:08:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: abb35b3ec9b87bffbe5921d1ccd67c66 SHA-1: 7ccbd7cbb6fd1f727b23c8a6248cfa18736e5df5 SHA-256: 8bb09b83eab067a8c74f37ce072abeb45c3ec3d33abb75573ac1a459454e7ff5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous external URIs, many pointing to compromised WordPress sites, suggesting it's part of a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • 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.
  • 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://crysiq.ru/uplcv?utm_term=benefits+of+non+probability+sampling PDF link annotation
    • https://centrobrands.com/wp-content/plugins/super-forms/uploads/php/files/341f66da68d2c99f6de519d333a6096a/kizuxosananegumi.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/lcs3mahp5v94oke2lh1k7s9eo8/2208426504.pdfIn PDF document text
    • http://veronikavilla.hu/userfiles/file/2009514500.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/16096c45115fb9---89281905874.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1607879d69220a---35084151227.pdfIn PDF document text
    • http://dermaktif.com/imgup/file/70302043613.pdfIn PDF document text
    • http://bagiez.com/userfiles/file/sisixipedubonolerenebav.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d139bcc8c89975d68072a4558281cd68/60718258168.pdfIn PDF document text
    • http://teenaramainc.org/clients/875997/File/fisirugi.pdfIn PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/e0cfbcd545f3b58ff69c3b90e0d7197d/91396140254.pdfIn PDF document text
    • http://gentlemensquartersbarbershop.com/wp-content/plugins/super-forms/uploads/php/files/93002646ae16ac37710b5f67c199d7cf/xemidikikumevolupis.pdfIn PDF document text
    • https://oncallanatomist.org/ckfinder/userfiles/files/butazesuwizivades.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16077e0ad81f8f---51689448951.pdfIn PDF document text
    • https://www.acetechnology.co.in/wp-content/plugins/super-forms/uploads/php/files/trenunstbkfcbk59h90t9212rf/sukabe.pdfIn PDF document text
    • http://1qjd.com/upload/files/2021-06-26-19-51-55-M9lYE6rl.pdfIn PDF document text
    • http://virtualcharityevents.com/vce_cake/files/files/zujej.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/cncn4agthf45auta9eah7k4nri/53017181427.pdfIn PDF document text
    • http://sjhrz.com/images/upload/File/sapepelimezetasolepeze.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdf80db583f---31490552254.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a113efb3659---41994212119.pdfIn PDF document text
    • http://staples1981.com/clients/b/ba/ba027a536d51c1d997ee76cae6dc9017/File/16605719580.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/5c4119503545d729c4aa9306cfdd8ef1/dovofuxamexoselewuxegav.pdfIn PDF document text
    • https://skyzoan.com/cake/beta/userfiles/file/pirefalokapuda.pdfIn PDF document text
    • https://webfox.net.au/wp-content/plugins/super-forms/uploads/php/files/8df831b74ee218d558cf05c2732262ca/ximife.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_off0000fa3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA3B 11008 bytes
SHA-256: c06a5d4874084d5f6ae0029be4f4af45f9ade1f68fe7c923fbeaed6f0939735d
font_01_sfnt_off000113a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113A8 17432 bytes
SHA-256: dd056441bfdca1d1d78404b2bbe16667312570110a7ddf3abd4e13944a782d0a
font_02_sfnt_off00014112.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14112 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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