Malicious PDF — malware analysis report

Static analysis result for SHA-256 299a884adec36a8d…

MALICIOUS

PDF

77.6 KB Created: 2021-09-15 17:05:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 40e5e17867cf58acbffe263e9b9a2996 SHA-1: b7709d475572720fe723f2e4ee60cefecca2bfde SHA-256: 299a884adec36a8d9f1385417a81cfac1e8cf93089c28d1c8c9abfb39ca74208
224 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous links to compromised websites and potentially disposable hosting, suggesting an attempt to distribute malware. The presence of a 'download button' heuristic further supports a social engineering attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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 https://polaria.cz/images/file/68592373575.pdf In PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161419f73bd4ee---46186060875.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/4btfdgkqddmojhgroskmrh1jj5/medowiwinutavevixoxonu.pdfIn PDF document text
    • https://guruamardaspublicschool.com/userfiles/files/feputigov.pdfIn PDF document text
    • https://cjsc.se/ckfinder/userfiles/files/44199577119.pdfIn PDF document text
    • http://booklandbooks.com/userfiles/file/35323198279.pdfIn PDF document text
    • http://cdjuchuan.com/upload/files/nosonupurozunogimevasoz.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134be1461627---46103105846.pdfIn PDF document text
    • https://estudiowebcolombia.com/ckfinder/userfiles/files/bulazemonorovaxutu.pdfIn PDF document text
    • http://mitcostruttori.it/userfiles/files/94101215952.pdfIn PDF document text
    • https://matricula.netlandschool.cl/files/raxufukijazezixinixodid.pdfIn PDF document text
    • https://groupburuemas1.com/contents/files/35402621344.pdfIn PDF document text
    • https://gemicilojistik.com/userfiles/upload/file/tasutu.pdfIn PDF document text
    • http://anneadamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/52121521450.pdfIn PDF document text
    • http://podwierzba.eu/ckfinder/userfiles/files/dunimexapi.pdfIn PDF document text
    • https://atlaskvartir.ua/data/uploads/files/91853378611.pdfIn PDF document text
    • http://medi-sen.com/files/files/xitili.pdfIn PDF document text
    • http://soncongnghiepjotun.com/media/ftp/file/43478909117.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/1612fa6776f04a---vekexumozudetolupivamala.pdfPDF link annotation
    • https://ls-machinery.com/uploadpic/files/202109061533374342.pdfIn PDF document text
    • http://tscyw.net/userfiles/file/20210914122539_tdte2u.pdfIn PDF document text
    • http://videotour24.com/data/fckupload/file/nutuvidira.pdfIn PDF document text
    • http://www.itidharamshala.in/images/uploads/files/zageke.pdfIn PDF document text
    • http://immobilieninvestors.de/userfiles/file/kiwojet.pdfIn PDF document text
    • https://eyescare.vn/app/webroot/upload/ckfinder/files/maranepabezukogu.pdfIn PDF document text
    • http://shriramashramssschool.org/userfiles/file/zatewatuwifivuke.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=so+long+insecurity+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cb2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB2C 10924 bytes
SHA-256: 3ef53e5dcacdae1f526e6ab7efc3e144e7b228b5b16818e968b38734c8e64fb5
font_01_sfnt_off0000e467.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE467 17144 bytes
SHA-256: 63b63e0e78071191950d06281e53fd28fb56d57c8d55dff59e27b5697781c72a
font_02_sfnt_off00011085.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11085 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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