Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5550c509591b64c…

MALICIOUS

PDF

70.3 KB Created: 2021-09-26 03:34:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4bdd546240cd9adb490b17106fbc6c96 SHA-1: e1e975de28bbadab8a69c33199a4e4e8a6ed7206 SHA-256: e5550c509591b64c4784242c8724ab5fac6221c25c92f3020ce2a40f678df60e
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to lure users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL heuristics and the overall structure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://ruishikaishi.com/upload/content/files/2021/09/20210921042845.pdf In PDF document text
    • http://sevimticaret.net/userfiles/file/situlapuveto.pdfIn PDF document text
    • http://chinastom.ru/userfiles/file/kakipaxutasuk.pdfIn PDF document text
    • http://www.siphonicflowmandiri.com/upload/files/jubasuwujunopu.pdfIn PDF document text
    • http://skipjackpoke.com/ckfinder/userfiles/files/jizinedafutu.pdfIn PDF document text
    • http://giovanniseneca.eu/userfiles/files/20610799344.pdfIn PDF document text
    • https://balaji-technology.com/userfiles/file/vedebanat.pdfIn PDF document text
    • http://phatnang.com/media/ftp/file/puxita.pdfIn PDF document text
    • https://cowichanseniors.ca/userfiles/file/42748756285.pdfIn PDF document text
    • http://adacu.org/userfiles/file/20210906160923.pdfIn PDF document text
    • https://sadex.pl/fck/file/69903462588.pdfIn PDF document text
    • http://topmebli.com/content/xuploadimages/file/vifumumafuzivameliluwevar.pdfIn PDF document text
    • http://www.addvanceo.info/userfiles/files/zasiligadusa.pdfIn PDF document text
    • https://108pizza.pl/uploads/userfiles/files/dotorutuliluxanukosadujix.pdfIn PDF document text
    • http://iberryhomemade.com/userfiles/files/70893593222.pdfIn PDF document text
    • https://motoralbini.it/files/file/58362938043.pdfIn PDF document text
    • http://www.oomedia.com.tw/ckfinder/userfiles/files/sovufesetedo.pdfIn PDF document text
    • https://aaaxxion.info/images/file/parotowet.pdfIn PDF document text
    • https://rafaela-motores.com/userfiles/file/xerewaxavufojeleguka.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/6e5996668a2b602b6deb367edf566cb9/rokomevuxogilin.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/161391e602a529---29651540124.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/71e780f6832483413ae676b075a458a9/wuxikidatekuk.pdfIn PDF document text
    • http://cctsw.net/whly/up_files/FCK/file/20210910_041849_133.pdfIn PDF document text
    • http://cesurmakina.com/userfiles/file/27777159696.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/161360ed605e16.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=how+to+gain+root+access+androidPDF 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_off0000b422.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB422 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC39 10576 bytes
SHA-256: 3132f244bd1470ef4a375036c3ae49cd128ae64ccb845d789dccd994f7a798c8
font_02_sfnt_off0000e451.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE451 15292 bytes
SHA-256: f4d88343bd1154ed3672d893478b498bc98c57926a09bd12b7aea5cd3e9e7517

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