Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3b92a7e3fb6798e…

MALICIOUS

PDF

94.4 KB Created: 2021-09-08 09:44:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c3e73dcf8bf67c3678699c7b6feff23c SHA-1: bc8ef54b19d5ebb42d1ca97db216bf7720358977 SHA-256: f3b92a7e3fb6798e0d1ade54599e89b361bfa6003e8ab21050cf264453a7178a
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to compromised websites and disposable domains, indicative of a link farm designed to manipulate search engine results or redirect users to malicious content. ClamAV detected this file as 'Pdf.Phishing.Trojan', and ML classifiers also flagged it as malicious, supporting the assessment of a phishing or malicious redirection attack pattern. No scripts were extracted, limiting the analysis to the URL structure and heuristic findings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9923

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://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160845407d03d4---75226589386.pdf In PDF document text
    • http://diysmart.net/userfiles/file/88466274160.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd24ae50d0---91274394438.pdfIn PDF document text
    • http://stilna-ya.com/_userfiles/file/mapusotixidupibajixi.pdfIn PDF document text
    • http://pcccphucvinh.com/upload/files/parokopobusutagafawu.pdfIn PDF document text
    • https://asset-books.com/userfiles/file/sopudogikinobunawopewowe.pdfIn PDF document text
    • https://khambenhxahoi115.com/images/files/jogavat.pdfIn PDF document text
    • http://makingtheturngolf.com/clients/9/92/925d9bae4ecf380f28dbe0e1390c16eb/File/mutekidizexuzolazajedome.pdfIn PDF document text
    • http://congtydaihai.com/upload/files/nuvusakagudonikitigoledub.pdfIn PDF document text
    • http://www.binghan.my/userfiles/file/77280425542.pdfIn PDF document text
    • http://lhs60to70.com/clients/3/32/32806278e47d7e4d905c37b1d6ebf04a/File/nefumemu.pdfIn PDF document text
    • http://grandp.ru/userfiles/file/jugakinoweropiromul.pdfIn PDF document text
    • https://ihotel2b.com/upfiles/editor/files/33872906317.pdfIn PDF document text
    • http://telekommarketing.com/firme_data/files/64621687669.pdfIn PDF document text
    • http://arohitourandtravels.com/userfiles/file/95534702413.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/f1d353ee0f53c1a6d4ed9ea6abde10ea/82589004075.pdfIn PDF document text
    • https://baobihungphu.com/media/ftp/file/jijodimosudul.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/689af596b8147627109bc0e7fd8554ae/rofukutalalesixego.pdfIn PDF document text
    • https://diedacorporation.net/freesiafiles/file/tegamekibagipa.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ae11da2b827---nedimebabukakusi.pdfIn PDF document text
    • https://estoniapools.com/contents//files/dazazolasajiwo.pdfIn PDF document text
    • http://ferramentabelleggia.it/public/file/zamabuwo.pdfIn PDF document text
    • http://bannhuaduong.net/upload/files/lixevamitile.pdfIn PDF document text
    • http://chukysovin.com/img-svc/files/rijetububepaparu.pdfIn PDF document text
    • http://zahradysnapady.cz/soubory/files/zefedamotinilegebuva.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=production+and+material+management+notes+for+mba+pdfPDF 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_off0000f004.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF004 11204 bytes
SHA-256: 30eefaf69191c9f9c748adea22fcbc9063d56179208995c6f7ffd24911101a3c
font_01_sfnt_off000109d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000121e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121E2 19496 bytes
SHA-256: c99dbbd848d35a957c9e40114c7954c13129e4adda8fd763b6ac989086d2ddee
font_03_sfnt_off00015451.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15451 16288 bytes
SHA-256: 93e112582875c809d3b32cfd266fd81baf3519925bc0d65a0146fcfd953ca35b

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