Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f21ac1a667b072d…

MALICIOUS

PDF

92.5 KB Created: 2021-08-17 05:27:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 34fa503a6e7d385027462d526628e3fd SHA-1: 9f056265d77e027661bbc654cc2c35f259608836 SHA-256: 6f21ac1a667b072d130f9723ec5f6d2eec17e27745d084c35fa42c368bed149a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating it contains malicious content. It functions as a link farm, with numerous embedded URLs pointing to various websites, some of which are hosted on compromised CMS platforms. This suggests an attempt to manipulate search engine rankings or direct users to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://netiko.fr/img/Data/file/pisanediwupoxopesut.pdf In PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/jur2s9dcbg9g10up9f2cesooc8/2028383054.pdfIn PDF document text
    • http://longarmquiltacademy.com/fckeditor/userfiles/file/9375359074.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607ada9abb046---37255995318.pdfIn PDF document text
    • http://hangtatmj.com/userfiles/89473788469.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/b04d21796a5cdd562ed3886c268a533e/70137031300.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ba42a164ed9---sorotaviweroj.pdfIn PDF document text
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/nig37b4s3gmp42nf9fr4jgeq97/jegux.pdfIn PDF document text
    • http://santamariamikado.com/uploads/files/24591701852.pdfIn PDF document text
    • https://apsco.ly/userfiles/files/sijilefoniz.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160be17ede7713---zugujewu.pdfIn PDF document text
    • https://thuaphatlaihoanghuy.com/uploads/files/raxofibepoligulowedi.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8b5b4ac882---95287684031.pdfIn PDF document text
    • https://ajitcoatings.com/uploads/92597388562.pdfIn PDF document text
    • http://e-restauracion.com/app/webroot/files/uploads/files/27940177567.pdfIn PDF document text
    • http://blevy.com/ckfinder/userfiles/files/binagipazubifusote.pdfIn PDF document text
    • http://btc-ltd.com/upload/file/81025347013.pdfIn PDF document text
    • https://www.utn.ac.cr//sites/default/files/files/torevarul.pdfIn PDF document text
    • http://vuatoyen.com/uploads/userfiles/file/dakipoxipuk.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/b8957d1051a62ef14c324da65dbb15e2/92724930996.pdfIn PDF document text
    • https://pottoka.info/files/galeria/files/39396844655.pdfIn PDF document text
    • http://energo-winstal.pl/userfiles/file/51820229901.pdfIn PDF document text
    • http://alanurturizm.com/rsm/files/94799310914.pdfIn PDF document text
    • http://randoquad72.fr/userfiles/file/poselek.pdfIn PDF document text
    • http://pinedafoundation.org/imageuploads/file/53953340080.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=is+schweser+enough+for+frmPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED15 16092 bytes
SHA-256: 9d5144547e0b729630886a3ad3ce48e7da84b0115899dd9c2390406af6f0fecd
font_01_sfnt_off0001025a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1025A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A6C 17828 bytes
SHA-256: dcd7b22bd05523b4e59a068c8b83f483fc4300b44ff538ca6f602739cc37b108
font_03_sfnt_off00014962.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14962 10520 bytes
SHA-256: 8bcdf066b82b13d5609bb4884008c03ed3acd2c93021a77861d75793f2d6303f

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