Malicious PDF — malware analysis report

Static analysis result for SHA-256 9037354ce425ea72…

MALICIOUS

PDF

119.5 KB Created: 2021-08-22 03:50:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f31ebb14e9c040354a2d9664a1ef2804 SHA-1: c48d64e928b9655e23f4a74a803db698a1ae02e8 SHA-256: 9037354ce425ea72a75eac6d83b604afc5c562f798cc0d77880f84f8f0d96b63
104 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised CMS upload directories, suggesting it's part of a link farm designed to distribute malicious files. The ML classifier strongly flagged this PDF as malicious, and the presence of a 'download button' heuristic further supports a deceptive download lure. No scripts were extracted, but the overall structure indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://symbioticlifetech.org/attfile/fckimg/file///2021072116058_1032147488.pdf In PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089c96b3259e---tokajuvalujoputupibaniluv.pdfIn PDF document text
    • https://hsse.cl/files/dibalevadameg.pdfIn PDF document text
    • https://mdteam.se/ckfinder/userfiles/files/87308706010.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/60353193046.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/16093deed5e49b---18678727554.pdfIn PDF document text
    • http://debschoen.com/userfiles/file/75351540723.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/78c4a4d21bef9866d7967cef63638028/difevubedukiwos.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b221c21c494---67079275142.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/kmlr9r5abdshen1et6agnpgu43/17254934421.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/0d626adcfffd2b36e861004e87d5b476/xilimavemawarazalex.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/kifof6v57g480c8r9nf68sf33j/85078190492.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/77cp3h4378mhthaso2u4g4uo6e/fuvidanavotadibow.pdfIn PDF document text
    • https://stdtekstil.com/upload/ckfinder/files/gulosesukuliwepigugadije.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/f291539a56dfbf039111053bfe39f338/25978304634.pdfIn PDF document text
    • http://nicolalazzarotto.com/userfiles/files/99543531759.pdfIn PDF document text
    • http://dansecyr.ca/pdf/file/vapaniwupapevetixaxasexa.pdfIn PDF document text
    • http://ranaghatpchsschool.org/userfiles/file/ponigonam.pdfIn PDF document text
    • http://gildiamasterov.ru/userfiles/file/zigaduvomapexal.pdfIn PDF document text
    • http://johnmichaelharrisonlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/38465121228.pdfIn PDF document text
    • https://study-abroad-travel.com/ckfinder/userfiles/file/38755044349.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/8o00375j56ki801u307b6234l7/xebidonotudemev.pdfIn PDF document text
    • https://schlosshotel-murten.ch/userfiles/files/60056142584.pdfIn PDF document text
    • http://pdww.ru/ckfinder/userfiles/files/38544949032.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/6pad915p599fm8gmpk2feor92e/55920852327.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=b%E1%BB%8B+de+c%E1%BA%A1o+gi%C3%B3+2PDF 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_off0001479c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1479C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00015fad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15FAD 18960 bytes
SHA-256: 1226e6ed72b1a672c0f5422d9d51c780f676f43865f753047de20b37cfcf403f
font_02_sfnt_off00017ee1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17EE1 10528 bytes
SHA-256: c2c3e5eb60aaf504d29edf35d88b0544bc84017f8ee78288f496b4d23c25449c
font_03_sfnt_off00019633.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19633 22216 bytes
SHA-256: f19dab212c9050d00de74b389c2d58e734a9f1380b2393bc763e6a58aa7d55ed

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