Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe55e8d1e80ad0f2…

MALICIOUS

PDF

88.0 KB Created: 2021-09-17 21:49:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 53e5ce5544cecf3973f5187ad12c6b84 SHA-1: 35711a7d73c4919414e00b51ea3427dad420cace SHA-256: fe55e8d1e80ad0f21cc62cb1fde8c2886fa0bb43abc1b677477ad400ceef2c51
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/pp5j5qqlbasi9nmgjgt56dfanm/99321071824.pdf In PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16136fedc05044---lisalovirivoviw.pdfIn PDF document text
    • http://bsp-oblspl.org/ckfinder/userfiles/files/49327077597.pdfIn PDF document text
    • https://inoxquochoang.com/app/webroot/files/images/pages/files/67598690249.pdfIn PDF document text
    • http://twtqedu.com/userData/ebizro_board/file/loxofiwuxijimerukesezig.pdfIn PDF document text
    • https://hgqq.hk/tony/churchofgod/ckfinder/userfiles/files/59877426003.pdfIn PDF document text
    • https://ismart99.net/upload/files/45170351493.pdfIn PDF document text
    • http://hyundaidongdo3s.com/images/files/rezemikab.pdfIn PDF document text
    • http://galeriejacqueselbaz.com/userfiles/file/39431600061.pdfIn PDF document text
    • https://ewt.cz/res/file/75590297519.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/603b785036a27a32acf5b7fd16594f18/94374097021.pdfIn PDF document text
    • http://damosushipleasanthill.com/uploads/files/51292342146.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/8s1uieeheq9tpmdaustvrvf873/66071373197.pdfIn PDF document text
    • http://cartopack.com/Images/file/naluve.pdfIn PDF document text
    • https://hotelmitrutarija.com/uploaded/files/sojogisabotasawitofodi.pdfIn PDF document text
    • http://zhongguohuachun.com/d/files/gijimexetazire.pdfIn PDF document text
    • http://bratislava.topenglish.sk/app/webroot/gallery/files/18950708336.pdfIn PDF document text
    • http://orderkiwicafe.com/uploads/files/bewaluxazinigoxipolebokuv.pdfIn PDF document text
    • http://designbeginnings.com/upload/file/85816697707.pdfIn PDF document text
    • http://gyuco.com/uploadfile/files/20210911_092908.pdfIn PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/3o5iomg4noouobbn52o9q7ngd0/21537694000.pdfIn PDF document text
    • http://furniture83.com/upload/files/78885915470.pdfIn PDF document text
    • http://simkoongschool.com/uploads/editer/files/2461058675.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=the+martian+full+movie+in+tamil+dubbed+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_off0000ef9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF9F 18840 bytes
SHA-256: b0e1442a212790910e62c209a6f25dfab3b5a62613b1d3062e09eeca9027c8da
font_01_sfnt_off000120e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120E2 10804 bytes
SHA-256: 45e519882e4a810d700e480d65fe98333ee5b42e9964ae4379b9be33cfc97222
font_02_sfnt_off00013995.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13995 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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