Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee9820e23f32095b…

MALICIOUS

PDF

81.3 KB Created: 2021-09-10 04:06:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 957865c54528d09f3729298dbcb30bbb SHA-1: 97e250230a695e9dc9ddcd3958af21706553e866 SHA-256: ee9820e23f32095bdcfb6e60bcf2bbaa789c48c6fa427d751b9b4b7af991e6e4
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Several heuristics indicate the PDF functions as a link farm, with numerous embedded URLs pointing to potentially compromised or disposable hosting sites. The presence of these link farms suggests an attempt to direct users to external malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 6

  • 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 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://stickers-moins-cher.com/userfiles/stickers-moins-cher.com/file/filofanodib.pdf In PDF document text
    • https://flavio-tonon.it/public/file/tijuvodanidofogem.pdfIn PDF document text
    • http://telesson.net/_UploadFile/Images/file/14992758986.pdfIn PDF document text
    • http://mikomisushi.com/uploads/files/wazarozajitisaxobomom.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/8fd226b274ee9d30d8305a3fb6b27d56/29388399280.pdfIn PDF document text
    • https://centrorevisionimonregalese.it/file/murig.pdfIn PDF document text
    • http://esteticka-stomatologie.cz/files/content/file/86129727044.pdfIn PDF document text
    • https://csodamalom.hu/files/files/50928914484.pdfIn PDF document text
    • http://terhautz.com/upload_files/files/60952154743.pdfIn PDF document text
    • https://vanphongphampmc.com/upload/files/40314795522.pdfIn PDF document text
    • http://zenobiacultura.it/userfiles/file///vafuwazukewupikovagu.pdfIn PDF document text
    • https://avukatwebsitesi.trakyasoft.com/upload/files/99492157028.pdfIn PDF document text
    • https://autopsrus.com/ckfinder/userfiles/files/legabisugotosuxa.pdfIn PDF document text
    • http://cottoneauto.it/userfiles/files/10779101721.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/16139c522374b0---zopetiwiwigeretineranekaf.pdfIn PDF document text
    • http://sherwoodchambergolf.com/ckfinder/userfiles/files/jolibawit.pdfIn PDF document text
    • https://textosl.com/upload/editor/file/sufikebudefexagazoniwa.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/08b3d1e34f07dde4f0178fab3c00f01e/7067445723.pdfIn PDF document text
    • http://duocthientam.com/uploads/ckfinder/files/43446325053.pdfIn PDF document text
    • http://apicn.net/upload/files/54518969374.pdfIn PDF document text
    • https://oreopay58.com/ckfinder/userfiles/files/gagara.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/16135d1daa508d---podakulazomazi.pdfIn PDF document text
    • https://postelezmasivu-ostrava.cz/ckfinder/userfiles/files/48536109325.pdfIn PDF document text
    • http://hanboo.cn/Uploads/file/2021090501573370554.pdfIn PDF document text
    • http://tiszaladany.hu/upload/file/71533220653.pdfIn PDF document text
    • https://speculatio.in/ci/userfiles/files/21590079362.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=forza+horizon+4+mobile+apk+downloadPDF 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_off0000d7ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7AC 10824 bytes
SHA-256: fe6e17791bfaf4f67d04d8add05ff1e53dd6deafffbe5848a4f1c39827818acd
font_01_sfnt_off0000f03a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF03A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001084c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1084C 18412 bytes
SHA-256: b1a6e653a987422c31985b3fff5298736a6f05c04d2cf0097c00b5c76957d987

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