Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfe36f9a6a15b0e5…

MALICIOUS

PDF

134.7 KB Created: 2021-09-01 15:57:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9a81036d7392f3b3693124c88c718da8 SHA-1: 86ae0f797c8c556b9dabc13ab65256ecde7cffcc SHA-256: cfe36f9a6a15b0e5675f48aed3904ee470ae8aa5690a97d36c482ee1128579cd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs and link farm patterns, suggesting it is designed to redirect users to potentially malicious websites. The presence of PDF-specific heuristics like 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating the PDF leverages compromised or disposable hosting for its redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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 https://allytemp.ru/uplcv?utm_term=hee+haw+agony+song PDF link annotation
    • http://movietek.vn/hinh-anh/files/jufebopov.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/6b1ca0a7086fdf397c3097d3de3d0081/leginejavifebijij.pdfIn PDF document text
    • http://eprdel.cz/userfiles/file/detilevivokejotudana.pdfIn PDF document text
    • https://ip-kamera-rendszer.hu/ckfinder/userfiles/files/19562739401.pdfIn PDF document text
    • http://donghozibistore.com/luutru/files/berofenewofixovegogigegov.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adbfc52d6d5---44374956130.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/160949828c559f---16483187817.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/5ba0legbbufi7ip2ptlmt6a81n/jabotomipipedanuzas.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ed68338e523---kifijizasoravosudomipa.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16073b5c82169b---4808490265.pdfIn PDF document text
    • http://china-hold.com/UploadFile/file/20210513230344940.pdfIn PDF document text
    • http://cpghollywood.com/userfiles/files/zivoketitupuwagitabaje.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160886ed9cfe93---10527501859.pdfIn PDF document text
    • https://alteanetworks.fr/img/file/vojokofutijunikezawexaw.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/4gu39dju7jd6027e1ulccu81ib/54523468424.pdfIn PDF document text
    • https://sieompaysdebray.fr/lesiom/txt/imgadmin/file/63593461130.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a9dbe1bbafe---90369432112.pdfIn PDF document text
    • http://bogelaipigeon.com/upload/file/gefofakixozasemulukata.pdfIn PDF document text
    • http://jingmingtai.com/filespath/files/20210825002014.pdfIn PDF document text
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/db8cf6be565b076eb477587c6e155799/61694743795.pdfIn PDF document text
    • http://dataction.org/demo/dataction/media/30203138367.pdfIn PDF document text
    • https://asharfilalkulfi.com/ckfinder/userfiles/files/nobepobegubanuzifuwipiw.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1608242f2ace40---32510614497.pdfIn PDF document text
    • http://buergerforum-tirol.at/file/13874004198.pdfIn PDF document text
    • http://podlahypilat.cz/admin/file/8705629258.pdfIn PDF document text
    • 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_off0001ac39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AC39 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001c44b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C44B 19208 bytes
SHA-256: 70a9db2207a8c369607b275bcb7b77cbdd773216f666628e025b52322c310fb3
font_02_sfnt_off0001f5f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F5F9 10244 bytes
SHA-256: b673d57a9c824174010b45af5d93f50be97ff8279d4218ab109d4f4dbe29719d

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