Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b9614eb4cfc6ddc…

MALICIOUS

PDF

76.7 KB Created: 2021-09-06 07:53:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a755db0207566df6305afe1c1d0f8e10 SHA-1: 5e516fb2314e4483fa90580b1418fae6aee742f1 SHA-256: 9b9614eb4cfc6ddc6a1600e57a6050203e57140b3198de0c1f28eb5acac09f9e
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised or disposable domains, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body is heavily obfuscated and unreadable, suggesting it's not intended for direct user interaction but rather to host malicious links.

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 http://guides2alpes.fr/uploads/file/12588963934.pdf In PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609be9ed6b8b5---57575587745.pdfIn PDF document text
    • http://ctkupavna.ru/upload/file/togojulumoseworugefaw.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/tokuwe.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/8668613701fe1188f4295960198fbd69/zubozeman.pdfIn PDF document text
    • https://arerp.kr/data/file///55767310001.pdfIn PDF document text
    • http://cableesmaltado.com/d/files/61767038495.pdfIn PDF document text
    • http://www.injamal.es/nueva/ckfinder/userfiles/files/69435658148.pdfIn PDF document text
    • https://m-astar.com/UserFiles/files/52097898809.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///2021748266642.pdfIn PDF document text
    • http://wmehoa.org/clients/d/df/dff1b85474dadb967ea0c40f6d5e37f8/File/70782538063.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094885291f76---36587954371.pdfIn PDF document text
    • https://fleschimmo.lu/userfiles/files/70490687900.pdfIn PDF document text
    • http://master-br.ru/img/file/lujosi.pdfIn PDF document text
    • https://gym-rectif.fr/ckfinder/userfiles/files/gegugozuka.pdfIn PDF document text
    • https://www.zolmedis.lt/ckfinder/userfiles/files/82455633822.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607dda0c5555a---49125757337.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/16094346356f2d---jirosivelidepar.pdfIn PDF document text
    • https://mpksieradz.pl/upload/file/veketop.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606cebb8c3135---pigejupufodobudeveg.pdfIn PDF document text
    • http://2m-m.eu/userfiles/files/mexowatixobaz.pdfIn PDF document text
    • https://transport.frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/najujepamixi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=worksheet+to+practice+writing+numbersPDF 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_off0000c79e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC79E 11188 bytes
SHA-256: 7cbba4d5b592250d71005594e4bf7cc1d9b7f58e33c714291e56e3ef1adc0744
font_01_sfnt_off0000e182.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE182 17012 bytes
SHA-256: 797c05e7d16ecdf87779bbcaebf62986fa5938cda671a19a95df838c057ca861
font_02_sfnt_off00010d46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D46 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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