Malicious PDF — malware analysis report

Static analysis result for SHA-256 80fdf93997456f63…

MALICIOUS

PDF

71.7 KB Created: 2021-09-27 04:50:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 128b958c5f2fbe8b6fd3e674585db41a SHA-1: 692790b350d40fe8b8ddddab33d11c568627fcfb SHA-256: 80fdf93997456f63b0604bc2e561d685afb0e6a710ddad709a6ad1d0ab1b9ef6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, containing numerous external URIs pointing to potentially compromised websites and disposable hosting. The primary purpose appears to be directing users to malicious content, likely for phishing or malware delivery.

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 https://catamma.ru/uplcv?utm_term=best+video+editing+app+android+free PDF link annotation
    • http://go-pxl.com/uploads/files/40365031467.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613901a5b15a9---81864422000.pdfIn PDF document text
    • http://seibyou-koujien.com/files/files/guzorapepav.pdfIn PDF document text
    • https://www.znackakvality.info/files/24516013645.pdfIn PDF document text
    • http://futurepoolandspa.com/ckfinder/userfiles/files/vinovoz.pdfIn PDF document text
    • http://lednotice.com/userData/board/file/jigikuxetapomeded.pdfIn PDF document text
    • https://ytdrive.com/CKEdit/upload/files/8968857404.pdfIn PDF document text
    • https://tcremich.lu/files/files/duxixugaludavisidowa.pdfIn PDF document text
    • https://maydangson.com/vietkiendo/upload/file/34092337367.pdfIn PDF document text
    • http://china-miyaco.com/img/file/202191310448.pdfIn PDF document text
    • http://radecznica.pl/userfiles/file/mozusituzeruwu.pdfIn PDF document text
    • http://dolinakrzeptowa.pl/public/upload/ckfinder/userfiles/files/nuxuxazapunasekajevexo.pdfIn PDF document text
    • http://tamtamphat.com/upload/files/titubefufiseg.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/ps54j2jgibn8f26n22t4l8voqf/ravedukatowobojogane.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613ed5cfeb2c8---49414323995.pdfIn PDF document text
    • http://novo-foto.ru/ckfinder/userfiles/files/30755383654.pdfIn PDF document text
    • http://espokebar.com/uploads/files/89061433659.pdfIn PDF document text
    • https://www.ksmt.edu.np/assets/ckfinder/userfiles/files/suzez.pdfIn PDF document text
    • http://tutek.eu/userfiles/file/58345722341.pdfIn PDF document text
    • http://condominiobrisasdelnorte.com/userfiles/file/69565827229.pdfIn PDF document text
    • http://www.jfac.kr/ckfinder/userfiles/files/giwixo.pdfIn PDF document text
    • http://aorganboys.handyfriendship.com/upload/files/sezulavasakudegex.pdfIn PDF document text
    • http://7m-shop.com/userfiles/file/49846182774.pdfIn PDF document text
    • https://turkuazhost.com/calisma2/files/uploads/xifusekenodexorovi.pdfIn PDF document text
    • http://195exim.com/datas/files/razedinesagatebo.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_off0000b5e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5E7 10748 bytes
SHA-256: 7dbe10366b53db5fd6a2a9b72d8c16c66b4140248960b72ae1ec37c49747845d
font_01_sfnt_off0000ce98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE98 16568 bytes
SHA-256: eec0e817f5d14f9abc1e56c9fcfc5983f46c1b80754b4480b9a70413bfc768a0
font_02_sfnt_off0000f8aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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